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Windows 7: DPC latency issue (audio lag)

02 Mar 2014   #1

Windows 7 64bit
DPC latency issue (audio lag)


I've recently started noticing significant audio issues (lag, stuttering, static) when browsing internet, both on chrome and firefox, Windows 7 64. It occurs when the browser is loading new content. After some googling, I've found out it is most likely related to DPC latency caused by some driver (DPC latency check proved that theory right, at least that I've had issues with DPC latency).

The latency checker results (red spikes are me opening new site like reddit, facebook, etc, in a new tab):

After running Latency Monitor program for about half a minute while browsing, I've got the following results:

cm11264 is a driver for my external audio card Xonar U1's chip, and I can't find anywhere in the device manager where I could update it, nor any corresponding driver on the manufacturers homepage (USB Audio,PCIe audio,USB audio ic,USB sound chip--C-Media Electronics, Inc.).

Even with the audio card disconnected and uninstalled, the latency checker shows serious spikes and the issue remains. I've also noticed few dozens hard pagefaults in chrome while running latency monitor.

At this point, I am stuck. Any ideas whether I am on the right track, and what more I can do to troubleshoot this issue, please? I'm gonna call Asus support regarding the sound card, but I doubt they can help much since I've already got the latest driver from their site, which is 3 years old at this point.

My System SpecsSystem Spec

02 Mar 2014   #2

Windows 7, 64 bit Home SP1, Win 8.1.1 Pro 64 bit

I had serious DPC latency spikes on my system after I installed Chrome. As it turned out the Google updater that was installed with Chrome was causing my problems. However, I uninstalled Chrome, using Revo Uninstaller Pro (which also searches out left over registry entries) but the Google Update program was still there. I had to manually edit the registry to finally get rid of the Google updater.
My System SpecsSystem Spec
02 Mar 2014   #3

Windows 7 64bit

Just solved the issue, or at least got the DPC down to acceptable levels for now(~100-2000us, compared to 60000us). Since I could not find how to update the Xonar driver, I uninstalled it completely, ran windows update and rebooted. After installing Xonar again, the lag seems to be gone, although I still haven't rebooted as the installer suggested (card is working anyways). Just gonna hold fingers crossed that it won't reset after reboot.
My System SpecsSystem Spec

03 Mar 2014   #4

Windows 7 64bit

Well, the lag is back. I didn't reboot or anything, it just came back next day - no changes made. Almost as if it's something that builds up. Any ideas how to proceed?
My System SpecsSystem Spec
03 Mar 2014   #5

Server 2012 R2, Windows 8.1 , W7 ultimate x64

I had a bunch of dpc latency issues on an old gigabyte p35 motherboard. I don't remember the settings that caused it, but everytime the cpu clock speed or multiplier changed (speedstep?), i would get a dpc latency spike.
My System SpecsSystem Spec
07 Mar 2014   #6

Windows 7 64bit

Solved by going to a store and buying a $10 network card.
My System SpecsSystem Spec

 DPC latency issue (audio lag)

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