Windows 8 and 8.1 Forums

DPC Latency issues

  1. #1


    Posts : 29
    Windows 8

    DPC Latency issues


    Recently been getting significant latency issues on my desktop after roughly a day/two of use (hibernating at night). This causes audio stuttering and static. Issue seems to be caused by ndis, and tcpip.

    Using DPC Latency monitor I noticed it would skyrocket to red whenever the internet got a burst of use, for example refreshing a browser page, or receiving a message on skype. A la:


    Spikes are page refreshes. Everything else is yellow (yellow not green as the software has issues with Win8).

    Ran a LatencyMon scan with my network card disabled:


    Quite the difference, stayed completely in the yellow in the DPC monitor.

    Network card enabled:


    Looks like tcpip and ndis are the offending drivers.

    Been happening for a few weeks now. Restarting solves the problem but only for a day or two. All drivers are updated as far as I can tell.

    Tried:
    chkdsk r f
    sfc scannow
    dism scan/restore
    defragment
    disk cleanup
    full virus scan
    driver updates (as best as I can tell)
    lots of other small solutions that escape memory

    Computer Type PC/Desktop
    System Manufacturer/Model Number PCSpecialist
    OS Windows 8
    CPU Intel® Core™i5 Quad Core Processor i5-3570 (3.4GHz) 6MB Cache
    Motherboard ASUS® P8Z77-M: MICRO-ATX, USB 3.0, SATA 6GBs, ATI®CrossFireX
    Memory 8GB KINGSTON HYPER-X GENESIS DUAL-DDR3 1600MHz, X.M.P (2 x 4GB KIT)
    Graphics Card 2GB AMD RADEON™ HD7870 - DVI,HDMI,2 mDP - DX® 11, Eyefinity 4 Capable
    Sound Card ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
    Monitor(s) Displays LG IPS
    Screen Resolution 1920x1080
    Keyboard Logitech k360
    Mouse Logitech G700
    PSU 450W Quiet 80 PLUS Dual Rail PSU + 120mm Case Fan
    Case COOLERMASTER ELITE 430 BLACK CASE
    Cooling INTEL SOCKET LGA1155 STANDARD CPU COOLER
    Hard Drives 2TB 3.5" SATA-III 6GB/s HDD 7200RPM 64MB CACHE
    Internet Speed 120mb/ps Ethernet wired cable
    Browser Chrome
    Antivirus Avast Pro Internet Security
    Speakers Realtek

    Any help would be appreciated.
    Last edited by Russs; 07 Sep 2014 at 05:51.

      My System SpecsSystem Spec

  2. #2


    The DPC Latency Checker is not valid for Windows 8. They have a statement to that effect on their web site.

    Try the Resplendence Latency program, which is valid.
    Resplendence Software - LatencyMon: suitability checker for real-time audio and other tasks
      My System SpecsSystem Spec

  3. #3


    Posts : 29
    Windows 8


    Hello,

    You mean use LatencyMon? I have been. Got a few snapshots of it in my first post to illustrate the problem. I know there's issues with the latency checker but the latency problems it highlights are still perfectly valid and correlate with LatencyMon.
      My System SpecsSystem Spec

  4. #4


    I mainly responded since I saw you had the invalid DPC Latency Checker displayed.

    Here is what the DPC Latency checker site says about Win 8

    Windows 8 Compatibility: The DPC latency utility runs on Windows 8 but does not show correct values. The output suggests that the Windows 8 kernel performs badly and introduces a constant latency of one millisecond, which is not the case in practice. DPCs in the Windows 8 kernel behave identical to Windows 7. The utility produces incorrect results because the implementation of kernel timers has changed in Windows 8, which causes a side effect with the measuring algorithm used by the utility
    You need to delete that and only work with the Resplendence program. However, I've never been able to digest all the info that the Resplendence program provides.
      My System SpecsSystem Spec

  5. #5


    Posts : 29
    Windows 8


    Even though there's inconsistencies, the baseline it provides gives a more user friendly view than LatencyMon. Its easier to look past the inaccuracies it gives and just at the major spikes. In other words I'm only using it for monitoring of hard faults which I then compare time wise with LatencyMon to get greater detail (and both programs always agree with each other). Its not causing any harm and its not effecting the latency itself, the benefits outweigh the drawbacks to using it.

    Thank-you though
      My System SpecsSystem Spec

  6. #6


    Posts : 18
    Windows 8.1 update 1


    Its the intel network driver. To be specific the 82579LM based Network Controller. I had the same issue on several computers and used the below solution to solve all issues...

    http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/DPC-latency-audio-mouse-skip-and-stutter-on-t420s/td-p/602481

    If you don't feel like reading the post on how to fix it, basically you need to install an older driver from this link:
    Drivers & software - HP Support Center

    Don't worry if your system is not an HP..it will work with any system that has the 82579LM
      My System SpecsSystem Spec

  7. #7


    Posts : 18
    Windows 8.1 update 1


    Quote Originally Posted by tabascojoe View Post
    Its the intel network driver. To be specific the 82579LM based Network Controller. I had the same issue on several computers and used the below solution to solve all issues...

    http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/DPC-latency-audio-mouse-skip-and-stutter-on-t420s/td-p/602481

    If you don't feel like reading the post on how to fix it, basically you need to install an older driver from this link:
    Drivers & software - HP Support Center

    Don't worry if your system is not an HP..it will work with any system that has the 82579LM
    I just searched your mobo and found it uses Realtek 811F network controller. Whats funny is people are reportng the same issue and the driver from here solves it:

    http://www.realtek.com.tw/downloads/...&GetDown=false
      My System SpecsSystem Spec

  8. #8


    Posts : 29
    Windows 8


    Uninstalled avast, issue disappeared. Reinstalled with just the free version, nothing bad yet. Think some of the pro features might've screwed me over.

    Regardless, thank-you for your help!
    Last edited by Russs; 11 Sep 2014 at 12:25.
      My System SpecsSystem Spec

DPC Latency issues
Related Threads
dpc latency high as hell in General Support
so i decided to download 2 dpc latency checkers, one said everything was fine the other was dangerously high i then tried having them open with aida64 and stresstesting everything, my entire pc started lagging and the latencymon didnt go up much but the dpc latency cheker spiked a bit higher, but...
After having my motherboard, graphics card and RAM replaced due to a power surge, I have been experiencing high audio latency, along with very poor sound quality which includes static noise, crackling. The sound is similar to that of an untuned radio. http://puu.sh/c5qgz/e691d9d8c7.png The sound...
DPC latency spikes from USBPORT.sys in Performance & Maintenance
Hey everyone, I'm yet another victim of DPC spikes caused by USBPORT.sys. I definitely know there are lots of other threads regarding this problem, but so far none of them have helped. I tried most of other tweaks suggested, from power management settings, to disabling stuff in the device...
High latency when WLAN is on in Network & Sharing
Hey folks :) I've run into a strange something, which I can't find any explanation for. Whenever I turn on WLAN in my router, the whole network suffers from an incredible latency. No online game is playable, but the download speed itself is not being touched (i.e. fullspeed) and websites load...
Solved is this 1ms+ DPC Latency normal? in Performance & Maintenance
I see lots of people going on about DPC Latency in Windows 8 not going below 1ms (1000us)... I have seen it on a few windows 8 machines ive tested.. heres Windows 8 installed on my computer : http://i.imgur.com/Kv1J8cn.jpg heres XP installed : http://i.imgur.com/DYbdUDy.jpg
Why is the DPC latency high on Windows 8? in Performance & Maintenance
I cannot recall what it was in Windows 7 exactly, but it was much less than 500us. In Windows 8, it never drops below 1000us. I measured the DPC Latency using the DPC Latency Checker. Any idea why this is? Immature drivers? (Specs in the sig btw) 7761 This is also on the *leaked*...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook