1. #1

    Stuttering during network activity - High DPC latency (ndis, tcpip, several others)

    Hi.
    Windows 8.1 x64
    MSI B85M-G43 (on-board sound and internet by Realtek)
    Intel Xeon E3 1241v3
    MSI nVidia GeForce GTX970

    I'm experiencing audio and mouse lag/stutter. I've noticed it starts when upload/download speed exceeds 500kb/s. I found several guides on this site on how to diagnose the issue and find the culprit(s), but I don't know what to do with them afterwards. I already had all the latest drivers, so I reinstalled them - didn't work; had no luck deleting them all and letting Windows handle updates; tried installing the earliest compatible version - solved the problem for a month and now stuttering has returned. I've updated all the drivers again (might as well, if it no longer helps?)

    I did the WPA/xperf thing several times over the last day. Most times it listed those with "duration" above 0,9ms:
    ndis.sys | NDIS 6.20 Wrapper Driver - Windows Update
    Wdf01000.sys | WDF Dynamic - Kernel Mode Driver Framework Runtime
    nvlddmkm.sys | nVidia Video drivers - Get from OEM for laptops
    tcpip.sys | Microsoft TCP/IP Driver (networking related) - Windows Update
    dxgkrnl.sys | DirectX Graphics Kernel - Windows Update
    storport.sys | Microsoft Storage Port Driver - Windows Update
    ntoskrnl.exe | NT Kernel & System - Windows Update
    dpclat_driver.sys | ?
    (The latest check attached as a screenshot)

    Disabling network adapter or sound devices didn't stop stuttering, neither did stopping antivirus/firewall or making firewall block all traffic, but strangely enough (for me), when I'm just not using internet (not downloading/uploading/loading a page/have anything using traffic in background) - everything is fine; so, is "not downloading anything" =/= "blocking traffic with firewall" or "disabling network adapter"?
    I also attached screenshots of DPCLatencyChecker with uTorrent in background (the one that's all red) and with uTorrent disabled, just refreshing two pages in FireFox (yellow one with few red spikes); and a screenshot from LatencyMon Drivers page.
    LatencyMon's stats:
    Read More:

    If anybody could help me regarding what do from here with stuttering, I'd be very grateful.
    Attached Thumbnails Attached Thumbnails Stuttering during network activity - High DPC latency (ndis, tcpip, several others)-03wpa-jpg   Stuttering during network activity - High DPC latency (ndis, tcpip, several others)-02dpclatencychecker-utorrent-disabled-jpg   Stuttering during network activity - High DPC latency (ndis, tcpip, several others)-01dpclatencychecker-utorrent-working-jpg   Stuttering during network activity - High DPC latency (ndis, tcpip, several others)-04latmon-jpg  


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  2. #2

    Re: Stuttering during network activity - High DPC latency (ndis, tcpip, several other

    OK, I guess the problem's solved now: it was Adguard (it's an ad-filtering software, highly recommend it despite everything). Disabling use of some "WFP-driver" in it's settings and rebooting the computer did it. No problems for the past week.
    xilolee and jcgriff2 say thanks for this.

  3. #3

    Join Date
    Dec 2013
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    World, Europe, Italy
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    1,464

    Re: Stuttering during network activity - High DPC latency (ndis, tcpip, several other

    Wow good to know and good job!
    Thanks for letting us know it.

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