HT Photosmart C6280 Causes DPC Latency

I have been experiencing high DPC latency (causing pops, gaps) when streaming video or audio. I have tracked it down to the HP Photosmart C6280. When it is disconnected from the USB port, the latency drops to normal (well below the 1000 range) but when the printer is connected the latency spikes and gradually increases to 4000 or more. The printer itself works OK. I have All-in-One software version 90.00.060.000 according to the splash screen, but Belarc Advisor tells me I have version 090.000.146.000 in use. It also says I have All-in-One version 111.000.006.000 in the computer but it hasn't been run for a year (I used to have a C5180). I have updated the drivers for my USB ports from Microsoft to Intel but that hasn't helped, and the latency problem appears only when the C6280 is connected. Does anyone have suggestions? Thanks.

Similar Messages

DPC Latency problem

Hi everyone ;)
I'm trying to fix my pc. I'm experiencing DPC Latency problem and it causes audio stuttering. I'm running Windows 8.1 x64. When I'm running LatencyMon, it shows me that some of my drivers give a really high latency.
I was trying to install new drivers, turn off my soundcard (Sound blaster Audigy SE). The problem started to occur, just after a clean install of Windows 8.1, two days ago. Earlier I did not have any problems
with DPC latency. The weird thing is, that I do not have any audio problems when playing games. The problems occur when I'm listening to music or watching movies. Thanks for your help and sorry for my bad english.
PS My computer specs:
Gigabyte GA-G41M-Combo (rev. 1.3)
4 GB DDR3 RAM
Nvidia GeForce 450GTS
Intel Core2Quad 2.5GHz
Creative Sound Blaster Audigy SE
Wireless mouse and keyboard (microsoft ones)
Drivers causing DPC Latency:
ntoskrnl.exe
USBport.sys
dxgkrnl.sys
nvlddmkm.sys
ataport.sys
CLASSPNP.sys
rspLLL64.sys
Thank you for your help!

Hi,
First, please let me know what player you use to listen to music or watch movies? I considered the codec conflict.
If there is any third part player installed, please remove it to check the issue.
If the issue still persists, please upload the .etl file here for further research.
Keep post.
Kate Li
TechNet Community Support

DPC latency + audio/mouse skip and stutter on t420s

Hello fellow thinkpad owners,
I have a new t420s (41717FU) core i7, 8GB RAM, and NVS 4200M discrete, win 7 64-bit pro. I use the minidock with 2 external 28" displays on DVI out.
I discovered major issues with latency with this machine; very noticeable loss of control for about half a second, plus annoying audio stutter, especially concurrent with network activity. This is quite frustrating, especially for a machine that is supposed to be high end core i7 with discrete graphics. I had a t410s previously and also had latency problems, and I know this is a real problem with several different models (just search 'annoying audio') on the forums.
I have used dpc latency checker as well as latency mon and narrowed the probable culprit to the network drivers associated with the gigabit ethernet. It took me a while to discover the relationship to the Intel 82579LM, since LatencyMon will identify the problem with NDIS.sys or NETIO.sys, giving sporadic latencies over 20000 microsecs, which made me think it was a Win 7 tcp stack issue or maybe some internal windows firewall blocking. During these spikes, the audio stutters, the mouse won't move, everything on the system just stalls for a split second. Temps on CPU seem within normal limits at about 70-80C. I've read everything I could find about this issue, including problems with NVIDIA drivers, ACPI, firewall/antivirus, etc etc, and tried most of those suggestions.
I spent a long time doing all kinds of testing, putting the machine on AC power and max performance, shut down various devices, disabled any component power-off states, disabled NVIDIA and displays, changed bios settings etc.
After all of this, I *know* my issue is related to the Intel Ethernet component, because if I disable it and use wireless connectivity (or no network at all) the problem simply goes away. Surprisingly, the wireless Centrino adapter, though slower, functions without any problem affecting DPC latency and I have no stutter with that (many have previously identified the wireless adapter being a problem especially related to power mgt).
Unfortunately, I require an ethernet connection. So just disabling that adapter is not an option. Here is what I've done to workaround the issue, though I wish it would be fixed for good with some kind of update from Lenovo, though I've called and emailed them and they seem to be ignoring this issue.
**** UPDATE 3/1/2012 ****
SOLUTION RIGHT HERE: INSTALL AN OLDER NETWORK DRIVER FROM HP (sounds crazy, but it works). See below link to driver download.
I (and many other owners of T420, 520, etc - see other posts if you doubt it) have *no* latency after installing this older driver from HP. But as soon as I install the Lenovo-provided driver 11.12.38.* or any later one from Microsoft or the Intel generic driver (intel no longer publishes the old driver), I see *immediate* problems with latency, mouse and audio stutter. But use the driver published by HP (specifically version 11.12.36.0, published 5/4/2011) -- Problem solved! I tested with streaming and browsing for several hours and no spiking or stutter.
Here's where to get the english language download from HP: >> DRIVER DOWNLOAD PAGE HERE <<
Lenovo, PLEASE: this is strong evidence of a faulty driver for those of us with a t420s (and other thinkpad users out there using the intel 82579LM chip under x64). I encourage you to review this solution and engineer an update for the Intel gigabit adapter, or at minimum, roll back to the older driver or some Lenovo approved derivative so it doesn't cause all of us notebook users such a major headache. It's very bizarre that we would need to go to another manufacturer to get a working driver...I was ready to return the machine over this issue!
Aside from that adapter problem, I've been pleased with the t420s performance and features. Thanks again lopiuh for this workaround.
Mojojojo in Austin TX
ADMIN EDIT - Lenovo is testing a beta ethernet driver. If you are willing to try it, please see the link below, and my post on page 6 of this thread. - mark
https://www.dropbox.com/s/llcgjaf45xpuoam/83rw20w1.zip
***** END UPDATE *****
**** OLDER STUFF I TRIED, which somewhat helped, but the real solution is to use the old HP DRIVER above. ******
Basically, my approach was to reduce the 'auto' parameters for the adapter, to reduce the amount of logic running on the adapter itself.
1. Install the PRO set extension tools on this adapter, so you can more easily manage advanced settings. I think Lenovo offers a version in the driver downloads area which adds this management extension, but it is not the standard one offered by the system update utility, and the intel site has a later driver, so I gambled and downloaded the latest version from Intel for this adapter. It installed without issue, but I'm sure Lenovo would prefer you stick with their OEM packages. Anyway, here's the one I used: http://www.intel.com/support/ethernetcomponents/controllers/82579/sb/CS-032239.htm (link near the top for the download). You may want to make a system restore point before you install any drivers outside of OEM approved.
2. Change the default settings for the adapter in Device Manager. Right click properties for the Intel 82579LM in Network Adapters. Change the link speed (if the extension was installed properly, you'll see the intel logo on the tab for Link Speed, and a choice for Speed and Duplex. Change this from 'Auto Negotiate' to whatever speed your network is. I have gigabit full duplex, and that worked for me. This by itself was the biggest improvement with DPC latency.
3. Go to the Advanced tab. I took the approach that I wanted to disable as much 'auto' stuff as possible, and force the adapter to use a particular setting. Thus:
Interrupt Moderation: Disabled
Jumbo Packet: 9014 bytes (I have several devices that can use bigger packets on network, such as readynas)
Performance Options: click properties: Flow control - Disabled; Interrupt Moderation Rate - Off; and then double the receive and transmit buffer sizes (for me this was 512 and 1024 respectively).
I hope this may be helpful to some other owners, but I don't work for Lenovo or Intel so please don't blame me if something goes wrong during your tweaking. This worked (for me) to significantly reduce stuttering problems, though they are not completely gone; your mileage may vary. If you have this same problem, I'd appreciate if you would post about it so I can understand if it is a more widespread problem.
Good luck, mojojojo
Austin, TX
Solved!
Go to Solution.

Hi mojojoj0
For my W520, up till now I do not have latency issues. My set of configuration for Intel NIC is slight different.
2. This may cause connection problems when you are connecting to different network. Different network (switches, routers) have different configuration. Previously I set it to Gigabit Full Duplex, I can't connect to any 10/100 network until I change it back to Auto negotiation.
I would suggest changing back to auto negotiation when you are connecting to outside network, not all places are using gigabit switches.
3. Interesting, I guess I would try it and feedback and see how much improvement for network performance.
From what I know, increasing receive and transmit buffer improve NIC and network card performance, but computer may slightly more memory.
Maybe you can try this, part of my settings:
Large Send Offload (IPv4) & (IPv6) Enabled
TCP & UDP Checksum Offload (IPv4) & (IPv6) Tx & Rx Enabled
IPv4 Checksum Offload Tx & Rx Enabled
Hope this helps!
Cheers
Peter
(Current: W520 4284-A99) (Refunded: W510 4876-A11)
=============================================
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Mark it as solved if the solution works for you, so it could be reference for others in the future
Dolby Home Theater v4 (ThinkMix V2)!
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-Sound-Enhancement-Thread/m-p/451401#M155...

HP Photosmart c6280 fatal error 1606 during installation - Windows Vista 64 bit

Hi! I have a HP Photosmart c6280 printer that we have had for a few years. We moved it and configured it for USB use instead of wired via ethernet through the network. It worked great, but now my wife's project is done. Now we have moved it back and wired it through the ehternet cable into the router.
It will print, but the HP solution center doesn't recognize it and it will not scan or do any othe functions. I have done a complete UNINSTALL and reinstall multiple times.
After installation I checked the event viewer and every install fatal error is a "1606" and it states the following:
Product: PS_AIO_02_ProductContext -- Error 1606. Could not access network location %APPDATA%\.
I am ata complete loss as to how to resolve this......someone please help!
Sheriff

I would suggest doing a L3 uninstall on the printer.
1. Run disk cleanup on your computer- you can pass this step if you want
2.Download and run the software and drivers below.=
3. Once the download is done extracting, cancel the download.
4.. Press the Windows key + R on the keyboard to bring up the run menu.
5. Type %temp% in the run field and click OK.
6. Look for, and open the folder starting with 7z (Example: 7zS2356)
7. Open folder Util
8. Open folder CCC
9. Run the uninstall_ L4.bat
10. When the uninstall has completed restart the computer
11. Run Disk cleanup from Accessories\ System Tools
12. Download and install the latest version of Adobe flash player
http://www.adobe.com/support/flashplayer/downloads.html
13. Use this tool to clean the system and registry. Note: This utility is not HP sponsored or approved.  HP and I are not responsible for damages or loss of data caused by the utility. This step is optional. You can skip it if you want.
http://download.cnet.com/Advanced-SystemCare/3000-2086_4-10407614.html?part=dl-6271865&subj=dl&tag=b...
14. Download and run the software and drivers below.=
15. Run the download to reinstall the printer
Note: Before making any changes to the registry make sure and make a backup copy.
Back up registry:
Type regedit in the search programs and files
Click file, and then export
Type file name, and chose save to location
TAKE OUT ONLY THESE KEYS/FOLDERS!!!
 HKEY_CURRENT_USER > Printers>DevModes2 > * c6280 *
- (delete printer name from window list; may need to check DevMode and Settings folders, too)
 HKEY_LOCAL_MACHINE > software> Hewlett Packard > Digital Imaging folder
- (delete ENTIRE folder – IF computer NOT an HP, delete the ENTIRE HEWLETT PACKARD folder)
 HKEY_CURRENT_CONFIG> System > CurrentControlSet > Control > Print > Printers > * c6280 * - (delete any HP printer folders and the folders of any printer not in use)
After this please restart the desktop, and then install the Download and run the software and drivers below. (select your OS)
Just a note - if you participate in this thread I must inform you that these services are not endorsed by HP, and that HP is not responsible for any damage that may arise to your system by using these services. Please be aware that you do this at your own risk.

Satellite U500-1DZ DPC latency problem with the graphic card geforce 310M

Hello
I have a problem with de DPC latency cause by the nvdia card driver.
I use my computer for audio and it's really not possible to work.
graph with geforce abled :
http://nsm04.casimages.com/img/2010/09/22/100922123519210586795529.png
when i disable the graphic card :
http://nsm04.casimages.com/img/2010/09/22/100922123519210586795528.png
Please give me an answer.
My computer is a Toshiba satellite U500-1DZ, intel i5
Thank you

Hi, thank you for your answers.
I have updated the last nvdia driver, the new bios and everything I found on this website, but It doesn't change anything...
Apparently I'm not the only one to have this problem, but I don't know if it comes from Toshiba or from Nvdia.
Do you know if it's normal to have four times "NVDIA High definition Audio" in the audio/video/games controllers ?
When I seactivated it it's a litlle bit less worth (but still not good)...
I'm using a preinstalled windows 7 64 bit version
Thank you !
Fred
Message was edited by: fredo0411

MacBook Air dpc latency problem

My MacBook Air (2x 2.86 GHz, 128 GB SSD) has poor dpc latency values, prohibiting, e.g., recording of DAB (digital audio broadcast). The problem would seem to be caused by the "too slow" USB drivers. I wonder, whether there is a remedy for this available? For details related to dpc latency see
http://www.thesycon.de/deu/latency_check.shtml
PS: Elgato apparently does not provide software/drivers for recording DAB. So switching to Mac OS on my machine does not help.
Siggi Engelbrecht

Hallo T1MUR,
vielen Dank für den Hinweis. Hat's gebracht!
Thanks a lot for that hint, I followed your suggestions and it worked just fine. The scripts you provided in my case all appear to just switch off KbdMgr.exe without leaving me with a lot of choices. I still have to figure out whether this behaviour can be improved by editing your batch files. For the time being it probably would suffice to kill the process in the windows task manager and to switch it on again if needed by double clicking it in the c:\programs\boot camp directory. One then has to reenable the function keys manually, whereas all other tunings affected by boot camp are kept. This is slightly inconvenient, but it's ok. The differences may be due to the fact that I am dealing with a MacBook Air, not a MacBook Pro.
Thanks again for your help, I really appreciated this.
Siggi Engelbrecht

HP photosmart C6280 shut down during scan session

I was scanning with my HP Photosmart C6280 yesterday when it threw a tantrum. It refused to scan. The buttons on the unit were totally unresponsive (on/off, scan and arrow keys---none of them worked); and it went into a loop of printing self-diagnostic pages (2 pages) which basically said that nothing was wrong. I shut down the computer and unplugged the printer. When I plugged the unit back in and turned on the computer, everything seemed back to normal...at least for a couple more scans. Then it threw the ultimate tantrum. It powered itself off, again the buttons on the unit were useless, and left the "!" orange light on (not blinking). I shut the computer down and unplugged the printer and left it overnight. This morning I plugged in the printer and powered up the computer and all I get from the printer is the solid orange exclamation (!) point and no way to turn it on or even receive error messages because buttons are once again unresponsive. Went to see the on-line manual for the printer and it was useless. If I try going in through the computer control panel, it just says the printer is off-line. Looks like it just died on me.

Your suggestion:"The most likely cause for a printer hangup like this, would be inconsistent power. Do you have the printer plugged directly into a wall outlet? The printer has a power moderator built in, so if it is plugged into a surge protector or battery backup, it may not be able to pull the power fast enough. I'd also check the USB port you have the printer plugged into on the computer. Is the plastic piece inside the port, blue or black. If it is blue, try switching it to an alternate USB port with that is black. The blue inserts generally indicate a USB 3.0 connection, which can also cause power surges from the computer to the printer." Intermittent power is NOT the problem. The printer won't respond to ANY commands. It won't turn on. The orange exclamation point (!) won't go off...and NONE of the buttons work. I have turned off the computer; disconnected all the cables; checked all the cables; re-attached the cables; powered up the computer and still nothging works. I can't troublshoot it from my computer because it won't turn on...I already tried. By the way, your suggestion which I quoted above, is word-for-word the EXACT same thing I was told when I was trying to update the drivers on this printer. (That answer seems to be the printer equivalent of the answer you get when you have a computer problem i.e. "make sure you delete all temporary files and cookies"). It didn't help then and it didn't help now. At least when I was trying to do the driver updating, the printer still able to be powered up. I ended up working the update problem out on my own...and probably couldn't do it again if I had to. I think computers and printers are engineered with "planned obsolescence" built in. We got this printer in 2007 and HP thinks 7-8 yrs is too long to own one printer. Have also noticed that every time a new printer comes out, it doesn't take any of the same cartridges as the old one did...even though it's probably all the same ink. There seems to be a LOT of people having printer problems...just going by the number of posts that have shown up on this forum since I posted early yesterday.

DPC Latency workaround for 2010 Macbook Pros

Current workaround for 330M users:
1) Again use PowerMizer Manager to use a fixed performance level, it should not matter which one so you can also use the power saving 2D mode (may be different on your setup though).
2) Open the NVidia Control Panel and go to "Adjust image settings with preview" (you will see a spining NVidia logo). Put the animation on Pause and minimize the NVidia Control Panel.
3) You may or may not have to do this: Either switch off Aero, or better change the "Compatibility" settings of your DAW application to tell Windows only to turn off Aero (Desktop Composition) for this application.
Also watch out when setting display brightness or speaker volume via key (especially when an overlay is displayed), it may cause dropouts. You can change those by mouse via the respective settings without issues though.

AttilaAfra on NVidia forum:
I still have DPC spikes (about 17000 µs) with the 266.58 driver on my HP EliteBook 8540p with NVS 5100M, Windows 7 64-bit. I've verified this with DPC Latency Checker, LatencyMon, and xperf. I have spikes also with the 266.35, 260.99, and 260.89 drivers. However, there are absolutely no DPC issues with 261.28, which was released only on Windows Update in December, only for Quadros in HP notebooks.
The NVS 5100 and FX 880 are based on the 330M GT chip. I modified the INF of the Microsoft build to install the FX 880 files for my 330M GT and lo and behold: No more DPC issues, neither in any mode (2D/3D) nor when switching modes.
I will have to do some test to see how professional audio applications are affected, but at the moment it seems that the maximum DPCs caused by the NVidia driver are down to what my rather clumsy workaround achieves.
You can find the modified INF attached to this post: http://forums.nvidia.com/index.php?showtopic=157614&view=findpost&p=1182843

DPC latency D10

Hi everyone, I´m new member here..
I´m interested to use D10 as digital audio workstation (DAW). My rig is D10 with double X5460. I have checked my system with DPC latency checker, and there exists latency -peaks aproximately 10-15 second intervals (link to analyzer: http://www.thesycon.de/deu/latency_check.shtml). DPC lantency checker is tiny and very easy to use analyzer.  I have tested XP 32 bit, Vista 32 bit, Vista 64 bit and 7 32 bit operational systems, OS on both SATA and SAS drive. Latency peaks disturbs real-time audio (and video) stream, so you shouldn´t have those. I have made testings system idling, wihout any audio hardware or drivers installed. I have installed newest bios and motherboard chipset drivers. I haven´t found anything special, what could cause latency peaks. Could it be windows system drivers / motherboard itself??. Do you have any information or interest linking to this subject??

welcome to the forum!
i just ran it on my D10 under server 2008 R2 (64-bit) and only had one red peak in about 5 minutes of testing.   i'm not into audio so i can't speak to this topic with any expertise.   my soundcard is an onkyo PCI-200SE running the latest VIA drivers for vista 64 (which are actually quite old).
there is extensive information on the page you linked regarding what causes spikes and what to do to try and resolve them.   have you read through this to see if any of the info applies to your system?
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

DPC latency

First of all I would like to say hello to HP community.
I have HP CQ71 laptop and experiencing serious DPC latency issue. While running DPC latency checker I receive >20000us latency what causes sound cracks. Tried to turn off ethernet / wifi / modem / other devices, but still no help. I have somehow decreased latency whit disabling Windows sounds, but still sometimes DPC latency peeks at ~20000us. Tried uninstalling antivirus, turning off firewall but still the same.
Please help me solving this issue. Thank you in advance.
My company dell didn't have any of this problems.

Yes, I have this same problem with my:
HP Pavillion DV-6
4GB DDR3 RAM
500 GB - 7200 RPM disk
and have been going around in circles for weeks trying everything the "experts" have suggested with no change at all. In fact, I've disabled EVERY driver and my DPC latency still spikes at over 20,000 microseconds.
In my case, I'm trying to record audio using a Line 6 UX-1 USB sound capture card. Whether or not this is attached, my DPC Latency checks peak at ~20,000. Needless to say, anything approaching this causes the recording to drop. VERY FRUSTRATING when I have spent 20 minutes getting my guitar tuned, warming up, getting just the right feel, then turn on "RECORD" and it works... for about 3 minutes, then the device just drops out... usually just as I'm feeling good about how it's going. Please... no advice about ASIO drivers, USB stuff, etc... With no audio recording software or hardware in play, the latency on this machine is through the roof!
Luckily, I bought this from Costco and can return it for a full refund. I'll try a Dell next and see if the problem follows the manufacturer (HP) or the o/s (Microcrap) . In that way, I'll make my way through all the hardware that Costco sells and report back here in a couple of weeks.

DPC Latency Checker

Thesycon's DPC Latency Checker is a Windows tool that analyses the capabilities of a computer system to handle real-time data streams properly. It may help to find the cause for interruptions in real-time audio and video streams, also known as drop-outs. The program supports Windows 2000, Windows XP, Windows XP x64, Windows Server 2003, Windows Server 2003 x64, Windows Vista, Windows Vista x64.
More information and download:
http://www.thesycon.de/deu/latency_check.shtml

Heres how to check for dpc problems ( full creds to nolay on competing mobo vendors homepage):
Step 1) Download and install the Microsoft "xperf" tool. It's in the [http://msdn.microsoft.com/en-us/performance/default.aspx]. It's small, just a few megabytes. This tool will tell you what actually caused the spike you see in dpclat.
Step 2) Run the xperf tool to start watching what's causing the spikes. Open a command line console, and then type:
xperf -on Latency
Step 3) Allow the xperf tool to collect information for 5 minutes while you use your computer. After you feel you did a little monitoring, then stop it. Type:
xperf -stop
This creates a C:\kernel.etl file which is a log of the DPC's and ISR's taking place during that timeframe.
Step 4) Create a report file so you can see where the spikes came from. Type:
xperf -I \kernel.etl -symbols verbose -a dpcisr > latency_report.txt
This will create a report file called latency_report.txt in whatever folder you're in.
Now, you need to interpret this file. It shows you a list of the maximum latencies produced by each driver. A DPC of 512 means one of your drivers/devices was blocking all processing on your system for 512us. All you have to do is find the one that says "512" on it.
Here is an example of one of my report.txt's:
In this case, dxgkrnl.sys is an Nvidia mobile GPU driver, and its power management is causing massive latency spikes in the system.
Looking forward to hearing your results if you have 10 mins to test this.
If anybody else can test this too, it would be awesome. I think these EVGA boards are high quality in the latency department, we just gotta find the device that's throwing the spikes.
Thanks a million,
- Nolay
I currently have a Msi z68 gd80 b3. The dpc stands pretty consistently around 30-70. I tried a Asus P8z68-v pro / gen3 where it bounced back and forth a lot.

Very High DPC Latency

I've been searching for months, i haven't found a solution. I have a dell 14r, and i've got very high dpc latency, i've disabled Intel speed step, i don't know if it was the cause, but helped a little, but a still have some high DPC.
here's the DPC Conclusion
CONCLUSION
Your system seems to have difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup.
Check for BIOS updates.
LatencyMon has been analyzing your system for 0:00:50 (h:mm:ss) on all processors.
SYSTEM INFORMATION
Computer name: ALEF
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: Inspiron 5437, Dell Inc., 01PN4H
CPU: GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz
Logical processors: 4
Processor groups: 1
RAM: 6048 MB total
CPU SPEED
Reported CPU speed: 1596,0 MHz
Measured CPU speed: 180,0 MHz (approx.)
Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.
WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.
MEASURED INTERRUPT TO USER PROCESS LATENCIES
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the
signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.
Highest measured interrupt to process latency (µs): 1572,913052
Average measured interrupt to process latency (µs): 22,366048
Highest measured interrupt to DPC latency (µs): 1565,856753
Average measured interrupt to DPC latency (µs): 11,824275
REPORTED ISRs
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.
Highest ISR routine execution time (µs): 364,749373
Driver with highest ISR routine execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Highest reported total ISR routine time (%): 0,106754
Driver with highest ISR total time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Total time spent in ISRs (%) 0,133510
ISR count (execution time <250 µs): 21131
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 3
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0
REPORTED DPCs
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.
Highest DPC routine execution time (µs): 747,735589
Driver with highest DPC routine execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Highest reported total DPC routine time (%): 0,297310
Driver with highest DPC total execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Total time spent in DPCs (%) 0,652473
DPC count (execution time <250 µs): 263660
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 253
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0
REPORTED HARD PAGEFAULTS
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted
and blocked from execution.
NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.
Process with highest pagefault count: explorer.exe
Total number of hard pagefaults 1115
Hard pagefault count of hardest hit process: 493
Highest hard pagefault resolution time (µs): 12225544,827694
Total time spent in hard pagefaults (%): 247,355044
Number of processes hit: 22
PER CPU DATA
CPU 0 Interrupt cycle time (s): 0,761402
CPU 0 ISR highest execution time (µs): 331,166667
CPU 0 ISR total execution time (s): 0,090588
CPU 0 ISR count: 7756
CPU 0 DPC highest execution time (µs): 678,561404
CPU 0 DPC total execution time (s): 0,432507
CPU 0 DPC count: 129558
CPU 1 Interrupt cycle time (s): 1,093584
CPU 1 ISR highest execution time (µs): 364,749373
CPU 1 ISR total execution time (s): 0,177768
CPU 1 ISR count: 13378
CPU 1 DPC highest execution time (µs): 650,636591
CPU 1 DPC total execution time (s): 0,566066
CPU 1 DPC count: 21399
CPU 2 Interrupt cycle time (s): 1,091097
CPU 2 ISR highest execution time (µs): 0,0
CPU 2 ISR total execution time (s): 0,0
CPU 2 ISR count: 0
CPU 2 DPC highest execution time (µs): 747,735589
CPU 2 DPC total execution time (s): 0,292306
CPU 2 DPC count: 112231
CPU 3 Interrupt cycle time (s): 0,461547
CPU 3 ISR highest execution time (µs): 0,0
CPU 3 ISR total execution time (s): 0,0
CPU 3 ISR count: 0
CPU 3 DPC highest execution time (µs): 338,436090
CPU 3 DPC total execution time (s): 0,020591
CPU 3 DPC count: 725

Hi,
Please refer to the article below:
http://blog.tune-up.com/windows-insights/title-poor-jerky-performance-fixing-unacceptably-high-dpc-latency-issues/
Andy Altmann
TechNet Community Support

How does the Edge E540 handle audio? (e.g. DPC Latency)

Hi, I know that some other Lenovo models have problems with very high DPC latency, causing drop outs and crackles while using CPU-heavy audio programs (music productiong, DJing etc), but I couldn't find any info specific to the Edge E540. So do any of you have experiences (good/bad) with the Edge E540 and audio?

Hallo T1MUR,
vielen Dank für den Hinweis. Hat's gebracht!
Thanks a lot for that hint, I followed your suggestions and it worked just fine. The scripts you provided in my case all appear to just switch off KbdMgr.exe without leaving me with a lot of choices. I still have to figure out whether this behaviour can be improved by editing your batch files. For the time being it probably would suffice to kill the process in the windows task manager and to switch it on again if needed by double clicking it in the c:\programs\boot camp directory. One then has to reenable the function keys manually, whereas all other tunings affected by boot camp are kept. This is slightly inconvenient, but it's ok. The differences may be due to the fact that I am dealing with a MacBook Air, not a MacBook Pro.
Thanks again for your help, I really appreciated this.
Siggi Engelbrecht

XFI Titanium high dpc latency after installing creative console launcher

HXFI Titanium high dpc latency after installing creative console launcher=im using windows 7 64 bit sp(rtm) this also happens with normal windows 7 64 bit(without sp).
when only installing the driver for the XFI titanium my dpc latency is between 0-50 with spikes that go to 90.
this also happens when I don't have any drivers installed.(windows high definition default driver)
however when I install the creative console launcher my dpc latency is allways above 00 and most of the time between 00-200 with spikes to +-400.
im using PAX PCIe Titanium ALL OS Driver V3.25, and creative console launcher 2.6.49 beta.
my question is can I use game mode without installing the console launcher?
is there a version of the console launcher that doesn't cause higher dpc latency?

Maybe a bad driver mod. Try Creative own drivers/CD first and see what happens.

ZBook 17 g2 - poor DPC Latency performance when running from z Turbo Drive PCIe SSD

I'm setting up a new zBook 17 g2 and am getting very poor DPC latency performance (> 6000 us) when running from the PCIe SSD. I've re-installed the OS (Win 7 64 bit) on both the PCIe SSD and a SATA HDD and the DPC latency performance is fine when running from the HDD (50 - 100 us) but horrible when running from the PCIe SSD (> 6000 us). I've updated the BIOS and tried every combination of driver and component enabling/disabling I can think of. The DPC latency is extremely high from the initial Windows install with no drivers installed. Adding drivers seems to have no effect on the DPC latency. Before purchasing the laptop I found this review: http://www.notebookcheck.net/Review-HP-ZBook-17-E9X11AA-ABA-Workstation.106222.0.html where the DPC latency measurement (middle of the page) looks OK. Of course, this is the prior version of the laptop and I believe it does not have the PCIe SSD. Combining that with the fact that I get fine performance when running from the HDD I am led to believe that the PCIe SSD is the cause of the problem. Has anyone found a solution to this problem? As it stands right now my zBook is not usable for digital audio work when running from the PCIe SSD. But it cost me a lot of money so I'd sure like to use it...! Thanks, rgames

Hi mooktank, No solution yet but, as of about six weeks ago, HP at least acknowledged that it's a problem (finally). I reproduced it perfectly on another zBook 17 g2 and another PCIe SSD in the same laptop and HP was able to reproduce the problem as well. So the problem is clearly in the BIOS or with some driver related to the PCIe SSD. It could also be with the firmware in the drive, itself, but I can't find any other PCIe drives in the 60 mm form factor. So there's no way to see if a differnt type of drive would fix the problem. My suspicion is that it's related to the PCIe sleep states - those are known to cause exactly these types of problems because the drive takes quick "naps" to save power and there's a delay when it is told to wake back up. That delay causes a delay in the audio buffer that results in pops/crackles/stutters that would never be noticed doing other tasks like video editing or CAD work . So it's a problem specific to folks who need low-latency audio performance (very few apps require low latency audio - video editing, for example, uses huge buffers with relatively high latency). A lot of desktops offer a BIOS option to disable those sleep states but no such option exists in HP's BIOS for that laptop. In theory you can do it from within Windows but it doesn't have an effect on my system. That might be one of those options that Windows allows you to change but that actually has no effect. One workaround is to disable CPU throttling. That makes the CPU run at full speed all the time and, I believe, also disables the PCIe and other sleep states. When I disable CPU throttling, DPC latency goes back to normal. However, the CPU is then running full-speed all the time so your battery life basically goes to nothing and the laptop gets *very* hot. Clearly that is not necessary because the laptop runs fine from the SATA SSD. HP needs to fix the latency problem associated with the PCIe drive. The next logical step is to provide a BIOS update that provides a way to disable the PCIe sleep states without disabling CPU throttling, like on many desktop systems. The bad news is that HP tech support is not very technical, so it takes forever for them to figure out what I'm talking about. It took a couple months for them to start using the DPC Latency checker. Hopefully there will be a fix at some point... in the meantime, I hope that HP sends me a check for spending so much time educating their techs on how computers work. And for countless hours lost re-installing different OSes only to show that the performance is exactly the same as shown in the DPC Latency checker. rgames

HT Photosmart C6280 Causes DPC Latency

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