DPC Latency will destroy the AVAST'S reputation ?

[PapaSmurf]

Hello,
Just an average user here, so I tried to duplicate system slow down and was unable to do so.
The image shows a few things going on at one time, and I have not noticed any slow down.
But I do thank you for this topic. It has allowed me to test for things that I might not have tested for.

[snarky]

if you use the windows XP use the rattv3 ,this it is a tool for auditing the execution times of interrupt service routines (ISRs), deferred procedure calls  (DPCs)
You can download here:
http://www.microsoft.com/whdc/DevTools/tools/RATT.mspx

go to C:\WINDOWS\system32\LogFiles\RATTV3 end open the logfile with wordpad end save to fix the words.
Put the log here.

I installed RATTV3.  Now I have 3 relatively large log files.  Not knowing what's in them, and not being able to really read them, I'm not posting them anywhere.

[Cako]

if you use the windows XP use the rattv3 ,this it is a tool for auditing the execution times of interrupt service routines (ISRs), deferred procedure calls  (DPCs)
You can download here:
http://www.microsoft.com/whdc/DevTools/tools/RATT.mspx

go to C:\WINDOWS\system32\LogFiles\RATTV3 end open the logfile with wordpad end save to fix the words.
Put the log here.

I installed RATTV3.  Now I have 3 relatively large log files.  Not knowing what's in them, and not being able to really read them, I'm not posting them anywhere.

wait a few minutes and the file will transform into .txt file (notepad).
or stop rattv3 using the icon (try icon).
upload your file here.
http://uploading.com/ end put the link here.

[snarky]

OK thanks.  Here's the file.  I'm not 100% sure I didn't screw it up by disabling the P2P shield before closing RATTV3, but I can't devote much energy to this.  The whole reason I am trying avast is because another vendor's product was consuming too much of my time...

[Cako]

OK thanks.  Here's the file.  I'm not 100% sure I didn't screw it up by disabling the P2P shield before closing RATTV3, but I can't devote much energy to this.  The whole reason I am trying avast is because another vendor's product was consuming too much of my time...

well my friend, I looked at your log and I have several drivers that you have.
and are even with high ISR and DPC.
VIDEOPRT.SYS
ntoskrnl.exe
Ndis.sys
but how avast is in conflict with them is a mystery.

NON.
I did the test that you suggested and had no results, still the same thing if I leave the P2P shield scans  emule files,but thanks again.

fear
this only happens to me when I use the P2P shield, if I upgrade to win7 and stick with high DPC without even using emule!
probably I'll  upgrade next year...
I'm afraid of it.................

PapaSmurf
DPC latency cause sound problems, no slow the computer,(in my case,until now)
in your photo shows green peaks, but went through a red  peaks and you did not show.
the DPC shows in your photo 18925us , read the warning about  Driver Error message "some device drivers on this machine"

[Chris Thomas]

Oh My God

I am also having DPC Latency problem with one of my PC

Check this screenshot



How do I fix this?

Edited:

Only when using YouTube

[NON]

Oh My God

I am also having DPC Latency problem with one of my PC

Check this screenshot



How do I fix this?

Edited:

Only when using YouTube

I can see you use Vista/7 PC, so please install Windows Performance Analysis Toolkit ,run xperf and see results.
With Stack walking method, you can see what function of the driver causes this DPC Latency.

1. Add the following environment variable:

_NT_SYMBOL_PATH = srv*C:\SrvSymbols*http://msdl.microsoft.com/download/symbols

2. From a command prompt, navigate to the Xperf directory and type

xperf -on Latency –stackwalk Profile

3. Wait for the high DPC activity to occur

4. type this and analysis will stop

xperf -d stackwalk.etl

5. Then run this command:

xperf stackwalk.etl

6. After opening xperfview window, go to "Trace" menu and check "Load symbols". If License certification window appear, press "Yes" and wait a minute.

7. Go to the area [DPC CPU Usage] and select high peak, then right click and press [Summary Table] on context menu.

8. Click selector tab (left in window), open [Column Chooser] and check Function at least.

9. You can see what function causes high DPC Latency in "Function" column.

10. Please report your findings here. Drivers' name, function, or any other findings.

Sorry for my bad English, I brought this way from Japanese WDK Support blog and I don't have enough skills to translate whole article.

Best wishes

[Cako]

Oh My God

I am also having DPC Latency problem with one of my PC

Check this screenshot

How do I fix this?

Edited:

Only when using YouTube

good morning or good evening everyone.

Chris Thomas.
Welcome.
follow the tips of NON.
put your log file (or your screenshot) here using the xperf, may help the ALWIL to see which drivers are being affected.
By coincidence some of them are the same to me,snarky end NON.

[bong2x]

in your photo shows green peaks, but went through a red  peaks and you did not show.
the DPC shows in your photo 18925us , read the warning about  Driver Error message "some device drivers on this machine"

wow! you are an expert now in dpc.

that only one peak come from the noise of network

if you can monitor the db of network, you can see that peak interphase with that noise

that 1 also in my peak rating

looks like cako and NON are best team in this post

Regards!!!

[Cako]

in your photo shows green peaks, but went through a red  peaks and you did not show.
the DPC shows in your photo 18925us , read the warning about  Driver Error message "some device drivers on this machine"

wow! you are an expert now in dpc.

that only one peak come from the noise of network

if you can monitor the db of network, you can see that peak interphase with that noise

that 1 also in my peak rating

looks like cako and NON are best team in this post

Regards!!!

just 1 red peak end the sound problem will appear on my PC happens every red peak.
he mistook slow pc with this problem and I just tell to him.
I'm no a expert and i dont like sarcasm.
Do you have done some research or something more useful to help solve this problem  
thanks for help us finding a solution  

[bong2x]

Do you have done some research or something more useful to help solve this problem

i did, but run out of solution.
what can i do? that battery control no updated software

look, if i disable it no peak, but if enable the peak is about 3209 micro second

and some dpc peak is created by wireless card, just like the peak of chris

Best Regards!!

[bong2x]

opps to big this the next picture when enable

[bong2x]

another picture

[bong2x]

continue from 3rd picture

[NON]

bong2x, you already find what causes your problem.

Try to use Device Doctor, it will show you more updates than MicrosoftUpdate. I don't think it could provide ACPI driver update, but may provide Wireless-Lan adapter drivers.
And, I heard BIOS (on mother-board) has something to do with ACPI before. So if you have BIOS Update on your computer, it's worth a try.
http://www.devicedoctor.com/


It seems your DPC Latency is also caused by power-management system... dynamic CPU clock changing, like nVidia Video Card?
I tired this but I don't have any change except for disappearing taskbar icon . Anyway, thanks for the information.

@Chris Thomas:
I also tried to see videos on YouTube , but I don't realize any changes so far. Very environment-dependence issue.