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Windows 7: Network usage causes high DPC Latency

02 Jan 2011   #61

Windows 7

Well I guess it's not clear sailing yet.

Things are looking a little bit better I think but I'm still getting spikes of around 16000 regularly... exactly every 40 seconds actually. and one as high as 116034 (my previous spike was 540694)

latency mon says windows' tcp/ip driver is the culprit

My System SpecsSystem Spec
09 Jan 2011   #62

Windows 7

Microsoft virus scanners apparently can contribute to the problem. If you are running Microsoft Security essentials or Forefront, try this:

1. Open Microsoft Security Essential or Forefront.
2. Click the Settings tab.
3. Click Excluded files and Locations
4. Click Add.
5. Select either of the following paths, depending on the scanner you are using:

c:\Program files\Microsoft security essentials\MsMpEng.exe
C:\Program Files\Microsoft Forefront\Forefront System\Client\AntiMalware\MsMpEng.exe

6. Click Ok.
7. Click Save changes.
8. Close the scanner program, and then restart the computer.

You might also try excluding other network intensive programs like iTunes.exe or iTuneHelper.exe.

For more on this, see the following:
My System SpecsSystem Spec
12 Jan 2011   #63

Windows 7

Thanks Darryl.. sounds like a good idea just in general!

Just a quick update on my end... I haven't had any autio glitching since I installed that last windows update. I have had some pretty large DPC spikes, but they haven't had any observable negative affects, so that is pretty cool!
I am pretty curious why this affected some of us so badly and others not at all
My System SpecsSystem Spec

17 Feb 2011   #64

Windows 7 Ultimate x64

I'm having this problem too, though I don't get as many red spikes. The spikes I get are perfectly synced with disruption in audio output which is horribly annoying. I've tried many of the suggestions in this thread and found that it seems to be my tcp/ip driver (according to LatencyMon's last report the highest execution time was around 15ms). Disabling the wireless network adapter (Intel WiFi Link 5100 AGN) gets rid of the spikes and audio disruption but keeping the WiFi disabled is not a viable option for me.

I wonder if this is something Intel could fix with a driver update (I have the most current drivers) or if it's more of a problem inherent to Windows 7 since this seems to be happening with other network adapters.

Anyways, replying and subscribing in hopes that a solution will pop up eventually.
My System SpecsSystem Spec
20 Feb 2011   #65

Windows 7 Ultimate 32bit

I've been struggling to find a solution for this high DPC Latency when I use WiFi for a very long time and almost accidentally after the last 12 hour round of fight I've done it.

The solution was as simple as changing a single option in the driver properties of my Intel Pro/Wireless 2915abg network adapter in Device manager.
In Advanced -> Power Management move the slider to "Highest" (which means no power saving and highest performance, not the other way around).
This changed the times from this

to this

The last one is not perfect but it's far better than before.

The laptop with this problem was an old Dell Latitude D410 with Windows XP SP3 but I hope this will help somebody else as I think that the problem is pretty general IMHO.
My System SpecsSystem Spec
02 Mar 2011   #66

Windows 7 Professional x64

I signed up to say that I've found a service that is a possible culprit.
If you suffer from Latency spikes appearing in certain intervals disabling the Service "Network Location Awareness" might get rid of the latency spikes. This service is not required for accessing the internet.

I appologize if this has already been pointed out.
My System SpecsSystem Spec
05 Mar 2011   #67
Krisp PL

Windows 7 Professional 32bit

I'm always getting red bars after power on/off or restart. But I've discovered everything comes instantly to normal (green bars) after putting computer to sleep and wakeing it up again. My comp is ASRock ION 330HT-BD desktop and about a year with Windows 7 Professional 32 there were no problems - they come suddently with windows update I suppose, because I didn't do anything myself in Windows config or software.

This fact comes me to a conclusion that there is some Windows 7 power management issue causing all this usb, ndis, audio etc. conflicts.

In the meantime, I'm only putting PC to sleep.
My System SpecsSystem Spec
05 Mar 2011   #68
Holy Moses

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

I have been having issues with this for some time now, as previously posted in this thread.

The problem ONLY ever arises when using uTorrent, Vuze or similar P2P apps (at least on my end)

The other day, I was looking for a program to cycle reboots to handle the latency. I thought I could find a program to reboot my PC every 4 hours or so, and with the way I have it set up at login (none), it would just be a 40 second pause in data transfer, at every set interval.

Well, I ended up downloading a program called Shutdown Scheduler. I messed around with it for while, got some scheduling set up and it suited my needs.

Then I reset it to default.....meant to set it again but forgot about. Magically though, I have not touched my PC in a week now, no reboots and no latency.

This is the only program I have installed in my laptop in nearly two months or so, and Windows updates were recently shut off as I also suspected them as being a latency trigger.

Long story short, I installed Shutdown Scheduler, and that alone seems to have fixed the issue. Maybe it's the Smart Ram feature it uses, but I no longer suffer from latency at all.

Hopefully some REAL answers come forth one day though.
My System SpecsSystem Spec
06 Mar 2011   #69
Krisp PL

Windows 7 Professional 32bit

For torrentz suff I bought dedicated PC for about 20USD (old IBM) which I operate through RDP. So, torrentz is not my problem :)
My System SpecsSystem Spec
14 Apr 2011   #70

Windows 7 Home Premium 64bit

Hi All!

I just registered to tell you guys what i did!
I've got an Acer Aspire TimelineX 5820T, with Realtek HD audio.
I've been having clicks and pops in my speakers for almost 9 months, since i bought the computer. I managed to solve it once, when I installed some new realtek drivers, think it was the 2.45 driver. But few weeks ago I decided to update to the newest 2.5X from the realtek website, and POOF, I got the clicks and pops again!

SO I read through this forum and finally, Holy Moses from pg. 4 came up with the solution for me!
I disabled the Atheros PCI-E Gigabit Ethernet Controller in device manager, and wolah. IT WORKS!!
Try it out!
My System SpecsSystem Spec

 Network usage causes high DPC Latency

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