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Windows 7: DPC Latency Checker shows problem but I can't find it

22 Aug 2012   #1

Windows 7, 64 bit Home SP1, Win 8.1.1 Pro 64 bit
 
 
DPC Latency Checker shows problem but I can't find it

I was getting some clicks in my recording studio system and ran the DPC Latency checker. It shows a problem, which I can't find (if it really is a problem). However, the clicks in my recording program went away after I changed the buffer size for my USB connected recording device (a Roland Octa-Capture) and I'm not getting any other audio pops/clicks which could be a latency problem.

I've set "diagnostic startup" in the System Configuration panel, rebooted and ran the DPC latency checker program and the spikes are still there. I've disabled all the devices I could in the Device Manager and the spikes are still there. I disabled core parking on my i7 3770 in case that was causing anything and it didn't change anything. I've looked at other system tools and didn't see anything, that I could recognize, as a problem, but I'll admit I'm not sure what I'm looking at on some of those panels.

The DPC Latency Checker will not run in Safe Mode so I can't test there.

I'm stumped on this one.



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My System SpecsSystem Spec
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22 Aug 2012   #2

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

Update, from info on the DPC web site this could be caused by a kernal mode driver. If this is the case, how do I go about isolating/determining what is it?

From their web site, which shows a display similar to what I'm getting:

Quote:
At a period of 3 seconds a kernel-mode driver in the system is stalling the CPU for about 3.5 milliseconds. So, every 3 seconds DPC latency is exceptional large and drop-outs in real-time data streams will typically occur
My System SpecsSystem Spec
22 Aug 2012   #3

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

Problem solved by Jim Rosebury, who builds custom recording system PC's, on the Sonar forum. The problem was "Easy Tune" that I installed from the Gigabyte installation disc when I first installed. I had removed most of the garbage that the Gigabyte disc installed but I missed the Easy Tune.

Latency is back to average 100 microsec's.

Jack
My System SpecsSystem Spec
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 DPC Latency Checker shows problem but I can't find it




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