KeSetevent() from kmdf driver DPC @ IRQL_DISPATCH taking from 40uS - 600+ uS

I have a kmdf driver that sets one of four events created in user space and mapped to kernel space via
ObReferenceObjectByHandle(pEvt,SYNCHRONIZE,ExEventObjectType, UserMode, (PVOID*)&pResetRequestEvent, NULL).
The mapped events are set in the kmdf driver using:
KeSetEvent(pEvent, IO_SOUND_INCREMENT, FALSE)
on a DPC running at IRQL_DISPTACH. 99.5% of the time, the call to KeSetEvent() takes ~42uS to run. .4% of the time the call takes > 300uS, and 3 times in a 3 second run it took > 600uS.
On the user side, a thread loops on WaitForMultipleObjects() processing any of the events that get signaled. Cycle-wise, the processing of all of the events is very similar
My question is:
Why is the DISPATCH_LEVEL thread's execution time dependent on something happening in user mode? Is it sometimes entering the scheduler and taking 600+uS? If so, might I be able to change the affinity of the DPC so that it doesn't get stuck behind
the scheduler?
Keep in mind also that I am NOT talking about DPC latency. I am measuring and referring ONLY to the call to KeSetEvent().
Any advice greatly appreciated!

Hi Wade,
You can check the document from the first link when you open the below URL:
https://www.google.co.in/search?hl=en-IN&source=hp&q=Locks.doc&gbv=2&oq=Locks.doc&gs_l=heirloom-hp.3..0j0i10l9.406.2371.0.2465.9.9.0.0.0.0.172.952.0j6.6.0.msedr...0...1ac.1.34.heirloom-hp..3.6.952.wR2Voiptb2M
Further, instead of using event, why don't you use overlapped I/O to process the data? Please check below link for details:
https://msdn.microsoft.com/en-us/library/windows/hardware/dn613924(v=vs.85).aspx
(Please mark as answer if it resolves your query. Please upvote if this post is helpful.)
Regards,
Rajesh

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No, I would not recommend making a disc image. I would recommend cloning the drive to a freshly erased external drive. Cloning is not the same as making a disc image. Disc images cannot be used to boot the computer. They are large and unwieldy. They are intended to be burned to an optical disc and not used as a system backup.
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Hi Johnny，
We wonder if you get this error on all PCs or only on your Windows 7 PCs.
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updated software/device driver.
Check your issue with malware, VS 2013 and firewall closed under new account.
If this issue happened recently, you could simply restore your system to earlier point then check your issue.
Check your issue under clean boot and safe mode with network (using new account)
https://support.microsoft.com/en-us/kb/929135
Regards,
D. Wu
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

How to option+delete (delete from hard drive) in iTunes 12?

In all prior versions of iTunes it was possible to option+delete a single or multiple tracks, which allowed users to delete the 'physical' files from their drives, as well as from the iTunes Library.
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Yes, that's how it's supposed to work. But it doesn't. Or it does only sometimes. Here's what indeed is supposed to be available when right-clicking:
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How to move SQL database from one location to another location i.e. from C' drive to D' drive

Hi, How to move SQL database from one location to another location i.e. from C' drive to D' drive ? please share some link.
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Hi Rangnath,
According to your description, my understanding is that you want to move databased from C drive to D drive.
You can detach Database so that the files become independent, cut and paste the files from source to destination and attach again.
There are two similar posts for your reference:
http://mssqltalks.wordpress.com/2013/02/28/how-to-move-database-files-from-one-drive-to-another-or-from-one-location-to-another-in-sql-server/
http://stackoverflow.com/questions/6584938/move-sql-server-2008-database-files-to-a-new-folder-location
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IOCTL's from a static library linked to KMDF driver

Hi,
Im trying to build a static library that can be used across multiple KMDF drivers. The library needs to send IOCTL's to another driver to access required functionality.
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-R___K

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Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

Time Machine Data Transfer - From FireWire Drive to Time Capsule - HELP!

Time Machine Data Transfer - From FireWire Drive to Time Capsule - HELP!
I've been searching for weeks for a solution to my problem. Here's the story I've come across since I installed Leopard on Oct. 26, 2007.
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Now, I have a 164GB DMG image of my Time Machine, with no hope in sight of gaining it back. I've tried taking the image, using Disk Utility, and restoring my original 200GB external with the imaged Time Machine data, but whenever I do, I come across error messages.
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Error message pops up:
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I select the image in Disk Utility, then proceed with the following steps:
* Click on "Image" then down to "Scan Image for Restore"
* I enter my password
After hours of waiting, I get another error message:
"Unable to scan. (Broken pipe)."
I'm going to see, after transferring the DMG to the Time Capsule, if I can drag-and-drop the files from the Time Capsule drive onto the 200GB hard drive.
IF anyone has any more suggestions, please let me know!

32 updates on this Mac since December 2007 - Hardware, software, OS...
They keep coming at about 6 or 7 a month. Some of them I don't care about, but several are essential. 10.5.3 has been seeded to the testers a couple of times and will probably show up in the next few weeks. Jaguar wasn't worth a d*mn until 10.2.6, Panther about 10.3.4, Tiger about 10.4.4 - I'd say we are ahead or on schedule Too bad I can't get Apple to fix Spaces. I wish they'd focus on what I want but I guess some take more time than others.
2007-12-18 00:32:39 -0800: Installed "GarageBand Update" (4.1.1)
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2007-12-19 09:32:03 -0800: Installed "MacBook MacBook Pro Software Update" (1.1)
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2008-01-16 09:18:07 -0800: Installed "iMovie Update" (7.1.1)
2008-01-16 09:18:14 -0800: Installed "Front Row Update" (2.1.2)
2008-01-16 09:18:45 -0800: Installed "iTunes" (7.6)
2008-01-16 09:19:31 -0800: Installed "QuickTime" (7.4)
2008-01-29 21:33:14 -0800: Installed "Keynote Update" (4.0.2)
2008-01-29 21:33:23 -0800: Installed "Pages Update" (3.0.2)
2008-01-29 21:33:31 -0800: Installed "Numbers Update" (1.0.2)
2008-02-02 01:18:43 -0800: Installed "iWeb Update" (2.0.3)
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MBP slow to boot and WILL NOT boot from external drive

I have two problems. First my friends MacBook Pro which is less than a month old is taking long to load. So I did a clean install without installing anything other than what came. Still slow to boot. Sometimes I see a light blue screen for a while before getting into the desktop. She complains of the beachball far too often. She says my MacBook is faster than her Pro, which is not right.
So I came down with my external LaCie drive, which I cloned from my iMac 24". I wasn't able to boot from the external (firewire) drive using her MacBook Pro. I thought my LaCie drive was bad or soemthing, but when I got home, I hooked it up to my MacBook and booted from the external drive just fine. I use SuperDuper to make a bootable clone.
So as it stands now, her computer is slow to boot into the OS, and it won't let me boot from my external drive. Does anyone have any idea what this could be? I did a clean install, used cocktail, etc. If it persists, I'll tell her to take it in.
Thanks,
Bryan

Robert,
I have no idea what you mean by Apple is not responsive to the issue. If you want help, please start a new topic thread so someone can help you identify the problem without the distraction of other people's problems around yours. Blaming people does not solve problems.
This is the link to post a new topic on this board:
http://discussions.apple.com/forum.jspa?forumID=1149&start=0
This is a user to user board. If you need help from Apple, call AppleCare directly here:
http://www.apple.com/contact/phone_contacts.html

G5 wont boot from hard drive after install

ok, so i bought my G5 from the school i go to but under their confidential stuff they had to take the hard drive from the computer before they could sell it to me. i thought that would be just fine as i could just get a new hard drive to replace it. turns out im having much more trouble then i thought. the hard drive i am using is a 1Tb western digital WD10EALS (http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?p_faqid=1400&p_created=&p_pv=2.295&pprods=227%2C295). when i install the disk it boots from the leopard retail disk and it reads the hard drive just fine. i select it and it goes through the install successfully. upon rebooting though, i get the blinking folder with the question mark on it. a lot of the stuff i have read says you can go in through disk utility and partition the drive but i still have yet to see anything that says something about disk utility. when it asks where to install OS X it shows the 900 some Gb of my hard drive and when i hit options the only options it has are upgrade, archive and install, and erase and install. and when you do erase and install it gives you the option of doing "journal" format or "case sensitive, journal" format. i suspected jumper settings but when i read through the manual on the WD website it didnt seem to say anything about doing something specifically for apple. it had a jumper for slower transfer rate 1.5Gb/s one called SSC which i guess is for radio interference.
any help would make me super happy, i am a computer technician and the reason i bought this computer was to step up my apple game. but having some trouble right now. thanks for taking the time to read this!
Message was edited by: chubbs899

Hi chubbs899, and a warm welcome to the forums & Macdom!
i have read says you can go in through disk utility and partition the drive but i still have yet to see anything that says something about disk utility.
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
How to format your disks...
http://www.kenstone.net/fcphomepage/partitioningtiger.html
Thanks to Pondini, Formatting, Partitioning, Verifying, and Repairing Disks...
http://web.me.com/pondini/AppleTips/DU.html
it gives you the option of doing "journal" format or "case sensitive, journal" format.
Don't use Case Sensitive, confuses many Apps.
i suspected jumper settings but when i read through the manual on the WD website it didnt seem to say anything about doing something specifically for apple. it had a jumper for slower transfer rate 1.5Gb/s
Yes, it needs that jumper on pins 5&6.

Broken in Logic 9?: Reindex loops from external drive

Adding loops from an external drive in Logic 9 does not seem to work any longer. It used to work great in L8. Anyone have similar experiences? Know any work arounds? Is it a bug? If it's a bug I'll file it with Apple.
Previously in Logic 8 it was easy to reindex loops on an external drive:
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(2) Use Finder to locate the loops on the external
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(4) L8 asks if you want to copy the loops or use them from their present location. Select present location intsead of copy locally.
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I have tried this procedure several times in L9 without success. Instead I get the following:
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(3) Drag the loop folders into the L8 media browser.
(4) L9 ask for my admin password.
(5) Enter my password
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(7) In the end nothing happened. No loops copied, indexed, or anything
There is only one way I managed to get loops into L9 but it is exactly what I'm NOT looking for:
(1) In the folder with all my loops spotlight search ".CAF" (In this case want to reindex Apple content which is all CAF)
(2) Make sure to click "show more" at the bottom of the search results.
(3) Drag the search results to the loop browser.
(4) L9 indexes them all right, AND also copies them to my user library! All 30 GBs worth. Definitely not what I want.
In the end, I had to reinstall the Loops from the DVDs and specify an external location for them. (This whole mess got started when I tried to move the GarageBand and iLife loops to an external drive. The installer does not let you specify a location for them.)
Just so you know I've done some homework:
I've scoured other Logic forums and found these relevant threads that in the end did not solve the issue. They mostly seem to refer to Logic 8 which does not have this issue.
@ LUG
Thread 1
@ Logic Pro Help
Thread 1
Thread 2
Thread 3 this fellow seems to have a similar problem as I. He drags folders into the loop browser but nothing happens.
@ Apple Discussions
Thread 1
Thread 2

I just installed LP9 and all my loops and samples are on external drives. The drag and drop onto the browser method worked fine and I WAS given the option to move the files or not. The only exception to the above is Ultrabeat samples. They seem to want to be on the System drive.
RW

My mac air died, after i reinstall from dvd drive, when i boot up again, i saw a prohibit sign showing up on the screen, then get to my logon screen. After logon, it takes very long time to load any application. pls help

my mac air died, after i reinstall from dvd drive, when i boot up again, i saw a prohibit sign showing up on the screen, then get to my logon screen. After logon, it takes very long time to load any application. pls help

OK. If you believe that.
When the disk is starting to die it can be bad for a moment and then be good for a while. If there was no problem while you were checking it of course it shows up good.
I tell you those are the signs of a disk that is about to die.
Allan

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Hi,
I use LR 2.7. I want to copy one file from one drive to another drive with the same file name. I thought you could drag the file, but it doesn't copy over the file in the other drive, can you explain what I have to do?
Also, I tried to import the folder into another drive, but it doesn't copy the keyword tags. Is there a way to do this?
Thanks
Barb

Hey Barb,
Well, if you use the Year/Month/Day/pictures_here format, none of the folders contains a massive amount of folders. It's not the number of folders that generates problems, it's having them all in _one_ folder that creates slow-down issues. Imagine if you had a deck of cards; look for one card... you have to go through all 52 cards to find it. But, if you broke it down into the 4 groups, you only have to go through 13, which is lots faster. Now imagine going through 15000 instead of 52...
Look at the way lightroom can automatically import by date; it has several preset formats. If you pick one of those, then when you import new photos, it will automatically create any missing ones, and you have lots less to do.
Depending on how much work you have already done, you might consider making a new catalog and just importing all of your photos again, and let it create everything quickly for you.
You could save all of your "edit" changes by writing out all of the xmp files first. But with 15000 files in one directory, this will double it to 30000 (one per image!), but will preserve all of your edits if you choose to make a new catalog approach.
As for combing catalogs, once you have one catalog the way you want it, you can select "import from catalog" and it will suck it into a new one, thus combining the catalogs. The only problem I can see is that it will import it in the format you already have it, so you have to organize it manually before you import it. Otherwise, you'll get your old format and your new format in the one catalog (but can then move pictures around if you need to).
Personally, I'd go the 'write xmp files, create new catalog' approach. Then just recreate my collections, etc.
But either way you do it, it will take some time processing, as that's a lot of files to start with!
Ciao!
Jason

I moved all my music from c: drive(because it was full) to an external harddrive and now itunes can't find any of my music. Is there a way to get Itunes to find music on external drive without having to place all the music back onto the c: drive? Thanks

I moved all my music from c: drive(because it was full) to an external harddrive and now itunes can't find any of my music. Is there a way to get Itunes to find music on external drive without having to place all the music back onto the c: drive? Thanks

Hopefully you moved the entire iTunes Media (or iTunes Music) folder to a new path on your external drive. Copy your iTunes library folder out to the root of the external drive, e.g. X:\iTunes (where X: is your external drive), then move the media folder inside it. Hold down shift as you start iTUnes and keep holding untila asked to choose or create a library. Choose the library at X:\iTunes\iTunes Library.itl. Should all be good.
Failing that, download and run my FindTracks script and point it at the new location of your media folder.
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KeSetevent() from kmdf driver DPC @ IRQL_DISPATCH taking from 40uS - 600+ uS

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