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Windows 7: Network usage causes high DPC Latency


06 Jan 2010   #1

Windows 7 64bit
 
 
Network usage causes high DPC Latency

Hey everyone,

Happy New Year

After about 24 hours of booting my computer, I have seen my DPC Latency spike tremendously. At first, I thought this was an issue with my network card (since disabling it would drop DPC Latency), so I bought a new card. The problem didn't go away, so I realized it was something else. High DPC Latency is a problem since it causes audio and video lag.

As I troubleshooted the issue, I have realized the spikes were caused from network activity. For example, when I am seeding [not necessarily uploading] many torrents or am loading a website, it shoots up.

See below for a before and after screenshot respectively.

Does anyone know what may cause this and how I could prevent it?

Thanks in advance for your help,
Dan



Attached Images
  
My System SpecsSystem Spec
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06 Jan 2010   #2

windows 7 ultimate x64
 
 

interesting tool, mine is mostly green with the odd yellow.

but my green is not stable and low, its hovering between 90 and 350, and I read others who consider 90 to be the max they expect. Some above 500 every 10-20 seconds as well.
My System SpecsSystem Spec
06 Jan 2010   #3

 

turn of the power management options through OS and bios & NIC (wireless and wired)

Onboard nic will cause lag but only through initialization
Power savings programs / settings will cause this as well.
My System SpecsSystem Spec
.


06 Jan 2010   #4

 

Quote   Quote: Originally Posted by brady View Post
turn of the power management options through OS and bios
Can you expand upon this please?
My System SpecsSystem Spec
06 Jan 2010   #5

 

You might also want to check to see if you have the "Standard Floppy Controller" enabled through your Device Manager, that seems to be causing DPC latency as well.
My System SpecsSystem Spec
06 Jan 2010   #6

 

DPC latency issues can really mess up things like TV Tuners.

Usually the peaks are caused by mal-performing drivers, the question is that it's not easy to determine which ones - or even whether any virtual drivers could be guilty, I get my PC right up into the red and it causes dipixellation and blocky abhorrences in WMC...

It's been so far, totally insurmountable. I've grown so sick of it that I'm thinking of blowing a wad on a network TV tuner in lieu of what's in my system specs
My System SpecsSystem Spec
07 Jan 2010   #7

Windows 7 64bit
 
 

Quote   Quote: Originally Posted by brady View Post
turn of the power management options through OS and bios & NIC (wireless and wired)

Onboard nic will cause lag but only through initialization
Power savings programs / settings will cause this as well.
Thanks for the response dude -

I have "High Performance" chosen under power options in Windows 7 and have turned off all power management stuff in my BIOS. Do you know how to do this through the NIC?
My System SpecsSystem Spec
07 Jan 2010   #8

windows 7 ultimate x64
 
 

I wonder if interrupt moderation available on good nic's helps dpc latency, I believe there is a link.

In terms of multimedia performance I get pop's in my sound but I believe this is down to bad windows 7 creative x-fi drivers rather than DPC latency as I get no spikes when they occur. Also I had alot of apps open when running the monitor, I really should have done it it after a reboot with nothing loaded.
My System SpecsSystem Spec
07 Jan 2010   #9

Windows 7 64bit
 
 

Update: When I exit utorrent and restart it, DPC Latency goes back to manageable levels. I think that after about 24 hours of seeding 150 torrents the latency goes crazy. Does this make sense?
My System SpecsSystem Spec
07 Jan 2010   #10

 

after 24 hours of seeding, I think anything could happen
My System SpecsSystem Spec
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 Network usage causes high DPC Latency




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