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Weird DPC latency problem

Last response: in Motherboards
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May 2, 2009 5:57:07 PM

I have been having a very weird problem with DPC Latency with my 1.86Ghz C2Duo, GA-965P-Ds3 motherboard system.

It started when I noticed sound popping, downloaded the dpc latency checker, and found that i had consistent 4000μs latency.

About a week of reinstalling xp, trying the windows 7 beta, bios updates, driver updates, and hair pulling, I haven't fixed the problem but I have made a weird discovery.

If I turn on the computer from a cold boot, and load windows (I'm using Windows 7 now), everything is good, and latency averages about 125μs, give or take 25.

If I reboot the machine. The latency will be all over the place. It seems to be related to video as if I maximize the DPC Latency checker so it fills the screen, the latency goes off the charts constantly. At a normal size the latency fluctuates wildly, but peaks around 6000μs.

The weird part, is that if i turn the computer off completely, and restart it. Everything is fine again.

I guess not rebooting the computer ever is a solution of sorts. But what could cause this in the first place?



a c 177 V Motherboard
May 2, 2009 10:36:01 PM

Do you have any unusual h'ware? I had oddball, inconsistent latency problems at one point that turned out to (apparently) be a driver problem for a Hauppage HVR-2250 tuner - all drivers past 27023 work OK on all OSs...
May 2, 2009 10:39:38 PM

bilbat said:
Do you have any unusual h'ware? I had oddball, inconsistent latency problems at one point that turned out to (apparently) be a driver problem for a Hauppage HVR-2250 tuner - all drivers past 27023 work OK on all OSs...


No, only a gtx 260 video card, 2 sata drives and an IDE dvd-rw.



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a c 177 V Motherboard
May 2, 2009 11:15:29 PM

I guess the next question is what's in your startup list? These days, it seems like every %$#@ thing you install has to put some POC (or two, or three) in startup - lessee, we gotta have an upgrade watcher, and a quick startup loader, and, um, an extra drive indexer (as if MS's wasn't bad enough), and, oh yeah, a monitor to tell us where your browser's been, so we can find more suckers to sell this ^&%$ to... I run QuickStartUp and check my services list after every single install, just in hopes of stealing some memory and CPU cycles for programs I might actually want to run!
a c 177 V Motherboard
March 28, 2010 10:23:19 PM

I'll get it all read & get back [:bilbat:8]
!