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

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rc87 wrote:
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Good Evening,
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Looking good!
Tracing route to bbc.co.uk [212.58.246.103]
over a maximum of 30 hops:
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2 1385 ms 1426 ms 1419 ms 217.47.106.122
3 783 ms 796 ms 847 ms 217.47.106.193
4 1024 ms 1004 ms 1069 ms 213.1.69.78
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6 1356 ms 1359 ms 973 ms 31.55.165.75
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10 1092 ms 703 ms 626 ms peer2-xe0-0-0.telehouse.ukcore.bt.net [109.159.254.102]
11 644 ms 738 ms 708 ms 194.74.65.42
12 * * * Request timed out.
13 1204 ms 1183 ms 1291 ms ae0.er01.cwwtf.bbc.co.uk [132.185.254.93]
14 1228 ms * 690 ms 132.185.255.165
15 888 ms 904 ms 909 ms fmt-vip132.cwwtf.bbc.co.uk [212.58.246.103]
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This is the type of latency I'm getting:
http://imgur.com/Yv3lZGT

GOOD NEWS!!
I fixed the ethernet - I cleaned all the sockets and connecters internally and removed the WiFi card and this is ethernet http://imgur.com/Euk1NXD
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Hallo T1MUR,
vielen Dank für den Hinweis. Hat's gebracht!
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Message Edited by Tom_D_123 on 03-30-200708:24 AM

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

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Here is a small HOWTO for getting the lowest possible DPC latencies (<100 us) on bootcamped Macbooks Pro (late 2008):
Disclaimer: I did all tests on my late 2008 Macbook Pro Unibody 2.8 GHz model with NVidia chipset and graphic. Most of the following suggestions should apply to standard Macbook models and likely older generation as well.
First of all Intel Speedstep can lead to dropouts and higher DPC latencies on small load! Unfortunately all tools that are supposed to manually switch Speedstep off don't seem to run on the late Macbooks (Pro) while on OS X you can use "Coolbook".
Your only way to make sure your processor is clocked high enough and not dynamically switching is to put up a constant load (like running your DAW pretty hot or running Prime95 at "Idle/Lowest" process Priority in the background). I will keep investigating if I can find a tool to switch Speedstep off.
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Kill the process "KBDMGR.EXE"!
That's Apple's driver for controlling brightness and keyboard lighting via the function keys and setting tap options for the trackpad. It seems to have broken multithreading!
You can also change the CPU affinity of KBDMGR.EXE to CPU1 (not CPU0!) which will help decreasing DPC Latencies alot, but there will still be Audio dropouts.
Here's a small toolkit I put together that allows you to conviniently enable/disable Apple's "Boot Camp" tray application (KBDMGR.EXE) via an icon link and/or keyboard shortcut. Optionally it will switch the function of the F-Keys automatically for you depending on whether Boot Camp is loaded or not.
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Boot CampED download page
Direct Download:
Boot CampED.zip - 3.3 kb
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Like on OS X the Airport module can lead to audio dropouts. The DPC Latencies produced by the Broadcom driver are less regular than the KBDMGR thing, alot higher in value. Best thing is to try for your own needs.
Update:Meanwhile a new Broadcom drivers was published via Microsoft's Update Catalog named "Broadcom - Network - Broadcom 4322AG 802.11a/b/g/draft-n Wi-Fi Adapter " (4322 is the chip used). This one comes with both low DPC latencies and finally the ability to use the full rate upto 300 mbit/s. Go get it! For safety you might still want to turn WLAN off during critical audio work though.
Change the graphic-card driver to "Standard VGA Driver" via Device-Manager or use RIVATUNER to enforce a fixed clock-rate and performance mode.
Update:The dynamic clock-rate switching happening with NVidia drivers in order to save power and keep temperatures low leads to extreme DPC spikes for each switch and constantly high DPC latencies when it settles in low performance 2D mode. RIVATUNER's "Enforce Performance Mode" option can be used to set the card to a fixed clock-rate. I recommend using "Low Power 3D" for audio work.
User of XP might think that they don't need this, but be aware that on XP the NVidia driver keeps running at highest clock-rates in "Performance 3D Mode" all the time. Via RIVATUNER you can switch to "Low Power 3D".
Turn off the ACPI compliant Battery driver via Device-Manager
This driver polls the battery for its current load status and produces a small, single, short spike exactly every 15 seconds. In my own tests I found that it doesn't seem to affect low latency audio performance. Furthermore turning it off will remove monitoring of your current battery status. But if you are running on power-chord anyway and want to make absolutely sure you can turn it off.
All other devices don't add much if anything to DPC latencies, but can savely be turned off if you don't need them (like Nvidia LAN, Bluetooth, Onboard High Definition Audio).
Attention: Removing the Battery while the power chord is connected results in permanently reduced CPU clock (downto the lowest clock setting possible). According to Apple this is done to prevent overloading the power-supply during heavy load as it needs the assistance of the battery from time to time.

I'd like to underline that these are workaround. Now that the Broadcom drivers are fixed it is up to Apple to fix KBDMGR and to get the NVidia drivers fixed!
Furthermore it seems as if only Vista 32-bit and OS X are heavily affected by Intel Speedstep, Vista 64-bit and Windows 7 (32/64) work alot better in this regard. XP is a mixed bag.
Here are some screenshots to prove that the workarounds do help:
DPC Latency before applying the workarounds:
DPC Latency Vista 64-bit (Idle, Speedstep enabled) after applying the workarounds:
DPC Latency Windows 7 64-bit (Idle: Speedstep enabled) after applying the workarounds:
As you can see Vista's DPCs run well below 100 us once everything is optimized, Windows 7 is a bit worse, XP is even better. But practically you get the same results when using all three for professional Audio work.
Message was edited by: T1mur

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cya

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