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Another DPC Latency problem / audio glitches

Good morning, Andrey,

Could you generate one more, a bit longer, XPERF log while having all the peripherals connected and experiencing issues?
 
Thanks for prompt responses, Tomas!

The test is here. What I've noticed - is that Dell Local Backup service (I've installed several days ago to try) active in startup panel was probably invfuencing the situation.
I've uninstalled it, and situation has improved partially.

One more question - following Lat Monitor standard sugestions while trying to find solution myself - I've disabled all CPU throttling in BIOS (c-states, hyperthread, speedstep,etc) except multiple cores support. I've also been disabling/enabling onboard audio and LAN/WLAN adapters, quitting CHROME, etc. trying to minimize the workload on the machine - though my CPU loads always were low.



What do yo think is it relevant and should I keep on switching everything off when working with audio or well-configure PC should handle everything hassle free?

Thanks once more.

Andrey

Download CPU3.zip from Sendspace.com - send big files the easy way
 
TomasD said:
That's strange. I cannot see bco_1394_x64.sys anywhere on the stack, neither in XPERF logs or LatencyMon screenshots Andrey attached.
Click to expand...

I think I know the reason - after upgrading the WPT to the 6.3.9600.16384 (previously 6.2.9200.16384) I can see KORG names, just as in your screenshot :) So - previous version of the WPT used the 'original file name' from the PE debug section instead of the actual name of the driver :)

m.
 
Hi, Thomas.Unfortunately the symptoms remain.

Playback of audio stream from Chrome stops with an audible abrupt glitch,
and then if I push playback in 5 sec - resumes and then again breaks.

What I've also noticed - that in the past with SpeedStep and Turbo modes enabled in Bios.
my СoreTemp monitor was always at 3.2 GHz (2.7GHz regular +0.5GHz of Boost as I understand).

While now after disabling/enabling through that BIOS tests period
its fluctuating from 0.8 GHZ upwards, that is quite logical though, but it was different before.

Thanks,
Andrey
 
The reasons for processor speed differences is clear now - they are both BIOS and Power plan dependant.
So in my Pro-Audio/Video mode, it always throttles on 3.2 GHz.

Keep on testing it in Pro Audio/Video mode,
though in Balanced mode - they happen regularly.
 
Hi Andrey,

I doubt it could be related to the CPU and I still think the issue is in the FireWire stack/controller or the drivers of one of your audio devices (especially, knowing at least one of them is not supported since Windows XP).

Could you please confirm you really followed this tutorial and changed 1394ohci to the legacy driver? If so, could you please generate one more XPERF report (sorry for bothering you with these, but there's really no better tool when working on these kind of issues) while experiencing audio issues when playing audio in Chrome?
 
Hi. Tomas.

No issues at all. I wil keep on running the tests the system as long as necessary.
As you may see from the title of the tread it already took me lots of nerves and time,
so I'll keep on investigating.

And the most painful issue is that I can hardly work.

I'm sure that I've followed all the instructions at the link you've provided.
But I'll doulbe check it again and will provide you with more reports.

Thanks.

Andrey
 
Thanks.

4th and 5th reports look really strange. It seems that all CPU cores were loaded 100%. That would explain the breaks. The problem is that for some reason all processes (apart from very few) in these logs are shown as UNKNOWN on WPA.

Could you please create one more log file, but this time using the following command?

Code: 
xperf -on PROC_THREAD+LOADER+PROFILE+INTERRUPT+DPC+[B]DRIVERS[/B] -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffers 256 -MaxFile 256 -FileMode Circular

Hopefully, that will provide some extra information. In addition, could you please download Process Explorer, run right after stopping XPERF, clicking CTRL+A and saving a list of all processes that are currently running?

As always, run XPERF for some time to be sure there were audio issues during the report capturing.
 
Hi, Tomas.
So it's getting tougher here in Kiev,
but we will fight.

Coming back to the point...
What I've also noticed that after switching to legacy driver - recording of audio is almost impossible -
tons of artifacts in recorded material.
I've meet that problem before but it was rare and normally after HW reset of the mixer it was gone, while now it does not help.

Please check the files/link attached.
Download CPU7.zip from Sendspace.com - send big files the easy way

Thanks,
Andrey
 

Attachments

Thanks.

In the latest log I can't see anything related to your audio devices/drivers that could impact high DPCs.

Please try the following:

  • Revert back to the default FireWire driver since the legacy one caused even more issues.
  • Try downgrading 82579LM Gigabit Network Connection drivers to the earlier version from here.
  • If the above doesn't help, try installing the most recent version of 82579LM Gigabit Network Connection drivers from here.
  • Paste output of verifier /querysettings command here.
 
After switching to previous driver version and installing your first driver suggestions -
for an hour or so the system runs smoothly. Can't believe it!!! but keep on checking )))
Thanks, Tomas.
Will post more bit later. It looks like it will be hot in the city today.

****

Add on: audio stream has been running smoothly till I selected another tab in chrome.
Then the syndrome appeared again.
So will dig it with a 2nd recommendation later.

Printscreens attached.
 
Good morning, Andrey,

I noticed you mentioned Chrome few times when talking about issues. Does issues occur when Chrome is closed and you are using, for example, Internet Explorer? Are there any issues when you are not browsing the Internet (have your browsers closed) and just listening music locally?
 
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