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Windows 7: Network usage causes high DPC Latency

06 Nov 2010   #41
SpellStorm

Windows 7 Ultimate 32bit
 
 

It's been a few days since I tried the solution and everything is in the green (literaly! )
I even tried running 3DMARK06 to see if it made any dent in my graphic performance and it didn't.


My System SpecsSystem Spec
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06 Nov 2010   #42
Holy Moses

Windows 7 Professional 32-bit///Vista Home Premium 32-bit
 
 

Quote   Quote: Originally Posted by SpellStorm View Post
It's been a few days since I tried the solution and everything is in the green (literaly! )
I even tried running 3DMARK06 to see if it made any dent in my graphic performance and it didn't.
My latency stays in the green until I open a bittorrent client then all hell breaks loose. I don't run a graphics card as I only a built in card. My problem is DEFINITELY related to my ethernet adapter. As soon as I disable it, all latency disappears.

I am convinced it is Windows 7 and the way it is interacting with various drivers is the issue.
It is the only common factor it seems in all these posts, and didn't seem to be a wide spread problem until recently, at least looking at various post dates on different forums since I started researching it.
My System SpecsSystem Spec
07 Nov 2010   #43
eross

 
 

Powermizer switch does not work on a Desktop PC. It comes up with an error that no powermizer is found.
My PC is relatively new, but I don't remember if I had the problem from day one. I'm thinking that perhaps it appeared after some windows update. I will go over all the updates and check if anything has to do with NDIS.SYS.
My System SpecsSystem Spec
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07 Nov 2010   #44
titule

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by SpellStorm View Post
[...]
So I looked up and here is the same solution without any program to download just tweak some reg keys:


\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{**a series of numbers that are different**}\0000\PerfLevelSrc

[...]



Step 4- Find "PowerMizerEnable" which is probably 5 ways down from "PerfLevelSrc". When you find it double click on PowerMizerEnable and change the value data from 1 to 0.


This will disable Powermizer
Thanks for that detailed instructions. Unfortunately, none of these keys exist in my registry. (I did search for keys, values and data, some classes where found but nothing you mentioned.


Quote   Quote: Originally Posted by SpellStorm View Post
hope this works for you. But in any case, if nothing is going over 0.8ms or so in your case, this is a very good latency and its weird that you are still getting spikes in DPC latency checker. Do you?
Yes, the values I posted where good values with only a few spikes. DPC Latency is always higher then 16 milliseconds(!) when using the network.


Quote   Quote: Originally Posted by SpellStorm View Post
I also should note that when I installed a fresh WIN7 (one of the first things I tried) before I installed ANYTHING else, the latency wasn't that bad - mostly yellow and only sometimes red, but after the sound drivers and especially the network and WLAN drivers were installed everything got crazy just like before.


Hope this helps I created an account & posted here just for this solution!
Thank you very much for that, this is very kind. If only more people would come back with solutions to the forums....

I never checked for DPC latency at the beginning (when I got that computer I did not even know that this thing exists.. those were nice times...)

It is clear for me now that DPC latency can have more than one cause and it is therefore not possible to find a one-for-all solution. I'm sure your solution will help some people with laptops and I hope someone will find a solution for me too.
My System SpecsSystem Spec
07 Nov 2010   #45
titule

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by eross View Post
Still waiting for Intel support to solve this. In the mean time I found a way to restore normal DPC latency without rebooting: Go to Services and restart Base Filtering Engine. After this you need to restart Windows firewall from the Action Center in the systray .
I tried this and get a message that the name of the service is wrong. "net help start" also does not list "Base Filtering Engine" as a parameter.
Is this related to the windows firewall? I use the pctools firewall..
My System SpecsSystem Spec
07 Nov 2010   #46
eross

 
 

Did you check to see if you have this service in the services list? (management console)
The Base Filtering Engine is related to the Windows firewall. If you don't have that service, try to restart your firewall service, and see if that resets the DPC latency.
My System SpecsSystem Spec
07 Nov 2010   #47
SpellStorm

Windows 7 Ultimate 32bit
 
 

Quote   Quote: Originally Posted by eross View Post
Powermizer switch does not work on a Desktop PC. It comes up with an error that no powermizer is found.
My PC is relatively new, but I don't remember if I had the problem from day one. I'm thinking that perhaps it appeared after some windows update. I will go over all the updates and check if anything has to do with NDIS.SYS.
yea it gives an error and asks if I'm sure and it might not work on older drivers or something I just clicked yes and everything is ok. but like I said, maybe there are different problems here. The only main thing connecting everything here is WIN7 .

by the way - I disabled all updates to windows as soon as I installed windows, and the spikes were there nonetheless. for me at least, I don't think it was an update issue.
My System SpecsSystem Spec
07 Nov 2010   #48
titule

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by eross View Post
Did you check to see if you have this service in the services list? (management console)
The Base Filtering Engine is related to the Windows firewall. If you don't have that service, try to restart your firewall service, and see if that resets the DPC latency.
It doesn't.
Well... it does for some time. But after restarting the firewall, it is back in the reds again.
My System SpecsSystem Spec
07 Nov 2010   #49
titule

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by SpellStorm View Post
by the way - I disabled all updates to windows as soon as I installed windows, and the spikes were there nonetheless. for me at least, I don't think it was an update issue.
Not a windows update issue. I think windows without any other software installed may work fine. But a soon as you install programs that actually USE the machine (like a fileshare program) you will get problems.
I don't have DPC lag when I don't surf. But that can't be the solution on a modern machine.. if I don't surf and only want to listen, I can use the ol' ghetto blaster.
My System SpecsSystem Spec
07 Nov 2010   #50
SpellStorm

Windows 7 Ultimate 32bit
 
 

Quote   Quote: Originally Posted by titule View Post
Quote   Quote: Originally Posted by SpellStorm View Post
by the way - I disabled all updates to windows as soon as I installed windows, and the spikes were there nonetheless. for me at least, I don't think it was an update issue.
Not a windows update issue. I think windows without any other software installed may work fine. But a soon as you install programs that actually USE the machine (like a fileshare program) you will get problems.
I don't have DPC lag when I don't surf. But that can't be the solution on a modern machine.. if I don't surf and only want to listen, I can use the ol' ghetto blaster.
Yea I believe you are right. while the spikes were constant during network traffic, once I stopped all connections and disabled all LAN and WLAN adapters it all went to the greenish-yellow. but still, every 10-20 seconds I would get like 2 spikes in a row measuring above 20,000.
My System SpecsSystem Spec
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 Network usage causes high DPC Latency




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