personally I I spent my time in the latest 27 hours doing tests on my computer.
I installed the Device Doctor and guess what, any driver needs to be installed or updated.
I uninstall Avast 5 end install Avast 4.8 (latest version)
Avast 4.8 - low DPC latency.
I uninstall avast 4.8 and install kaspersky.
kaspersky - low DPC latency.
I uninstall kaspersky and install AVG.
AVG - low DPC latency.
I uninstall AVG and install Avast 5 version 396.
Avast 5 version 396 - low DPC latency.
I uninstall Avast 5 version 396 end install Avast 5 version 462.
Avast 5 version 462 - very high DPC latency.
when I deactivated the P2P shield scan - low DPC latency.
well, the only thing left to do its downgrade the drivers, but I will not do.
I'm using Avast 5 version462.
My sister's computer:
have the exactly same result.
her computer has a conf. completely different from mine.
Next version of avast.
I'll wait for the next version and see if the problem continues, I will create another topic again, end again,end again , end again, end again..........
thank for everything guys.
Just curious
Why are you messing with Avast 5.462?
That is ancient history.
Current Config
Windows 7 HP x64
Firefox 4.0b10
AIS 5.1.889 all real time shields running
Programs running
1. Thunderbird
2. Firefox with 7 tabs open
3. AIS 5.1889 doing a full scan of of Video and Audio files 127 GB on an external USB HDD
4. uTorrent running and downloading one file about 15 kB or so
5. Playing one YouTube streaming video
DPC remains consistently under 500us at between 125us and 300us, though it did spike up to around 500us when the Youtube video began to download. After that and for the duration of the video the DPC remained under 300us. It was a musical video about 4:30 in length
However I did get one spike into the Red when "SystemRestoreCreation" was completing. SRC is a third party application that allows you to back up your registry on Windows 7. Windows 7 has no functionality to just back up the Registry so I use this program and run it daily using Windows Task Scheduler.
I just manually reran SRC. The only difference this time is there was no Video playing. I got the same Red spike when it finished. Just one bar when the program finished and popped up its small window indicating that the backup was complete and successful.
No biggie since this is a 3rd party program that runs only once a day and the Red DPC was only one bar when the program completed. However, it is something that I may look further into.