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Windows 7: NDIS.sys DPC Latency Issue

06 Jun 2012   #1

Windows 7 Ultimate x64
NDIS.sys DPC Latency Issue

*I know this has been threaded all throughout the internet on many different websites and I think we need too get to the bottom of this.

As usual, this is a problem that happens when I use Windows 7 64-bit. (I think it's happened to 32-bit users as well, and I read some cases with XP users... but as for me when I had XP, I never experienced any of this).

In my case, I need to run Windows 7 due to the fact that I have 8 gigs of ram in my system and Windows XP 64-bit has basically no drivers developed for it that are in working condition. My specs are: ASUS M4A785-M mobo, AMD Athlon II X4 620 Processor 2.60GHz, 8.00 GB of RAM, Realtek PCIe GBE Family Controller, XFX AMD Radeon HD 6950 2048mb, Steinberg CI1 Audio Interface.

Basically when I disable the network adapter, everything works smoothly, music, games, video files, etc. but once it's on, my LatencyMon shows NDIS.sys running at 33ms where as everything is in the microseconds more or less. Although at the very moment netbt.sys is running at 2ms (I don't know if that's bad or good) but I definitly notice when the network adapter is disable, I get no audio-dropouts/static/distortion. Is there any way of fixing this issue that anyone has come up with? I tried a whole bunch of different methods including updating drivers, uninstalling applications one by one, disabling/enabling different options in control pannel, power management etc. NOTHING but disabling my network adapter does anything so I know that is the problem... The only 2 questions that remain are, how to go about fixing it? and why hasn't Microsoft addressed this issue? (because I see it with all different types of network adapters, not just Realteks.)

Thanks in advance

My System SpecsSystem Spec
06 Jun 2012   #2

Windows 7 Ultimate x64

My System SpecsSystem Spec
17 Nov 2012   #3

Windows 7 Prfessonal x64

I've been trying to figure out this problem for a long time. I even got Dell to replace the motherboard on my PC (because the network adapter is integrated) in attemp to resolve it because updating all the drivers and re installing everything from scratch didn't solve anything.
It's unbelievable that nobody seems to have a solution for this.

Rebooting my PC solves the problem temporarily but the NDIS.SYS driver eventually starts spiking over 50 ms.

Doesn't anyone have a solution?
My System SpecsSystem Spec

17 Nov 2012   #4
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

I have no exaxt solution but I know that latency issues relate nearly always to drive problems. You can run this program - if it gives you red bars, it may have some hints below the bars which driver is the culprit. DPC Latency Checker
My System SpecsSystem Spec
17 Nov 2012   #5

Windows 7 Prfessonal x64

Yes, I already run DPC Latency Checker. It doesn't show which driver is lagging. A better utility is LatencyMon LatencyMon - CNET
It can show each driver and its highest execution time. This is how I confirmed that ndis.sys is the culprit.

Since posting earlier I found another forum that suggested updating my chipset from Intel Intel Download Center
I ran their Driver Update Utility and it showed there is a newer version of the chipset driver so I updated. So far so good but time will tell. As I said before, simply rebooting will solve the problem temporarily so I won't know if it's really fixed until I've used my PC a few hours.

I just noticed that ndis.sys spiked to 9.5ms -- better than 50+ ms but not encouraging.
My System SpecsSystem Spec

 NDIS.sys DPC Latency Issue

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