Windows 10: High DPC latency (especially ndis.sys and tpip.sys)


  1. Posts : 1
    Windows 10, build: 15063 (x64)
       31 Dec 2017 #1

    High DPC latency (especially ndis.sys and tpip.sys)


    I've had a problem with DPC latency for several months (craks/pops/random dropouts when listening to music/sound). I recently found out about LatencyMon and let it run for about 15 minutes. The result is pasted below. I'd appreciate if you could suggest what to do next.
    Am I correct in understanding that the latency caused by ndis.sys and tpip.sys happens because I'm using a WiFi network?

    Thanks in advance for your help.

    LatencyMon result:






    CONCLUSION
    ____________________________________________________________________________________________________ _____
    Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
    LatencyMon has been analyzing your system for 0:15:17 (h:mm:ss) on all processors.


    ____________________________________________________________________________________________________ _____
    SYSTEM INFORMATION
    ____________________________________________________________________________________________________ _____
    Computer name: LAPTOP-C6TE2AP4
    OS version: Windows 10 , 10.0, build: 15063 (x64)
    Hardware: Aspire E5-575, Acer, Ironman_SK
    CPU: GenuineIntel Intel(R) Core(TM) i3-6100U CPU @ 2.30GHz
    Logical processors: 4
    Processor groups: 1
    RAM: 6017 MB total


    ____________________________________________________________________________________________________ _____
    CPU SPEED
    ____________________________________________________________________________________________________ _____
    Reported CPU speed: 2304 MHz

    Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.


    ____________________________________________________________________________________________________ _____
    MEASURED INTERRUPT TO USER PROCESS LATENCIES
    ____________________________________________________________________________________________________ _____
    The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

    Highest measured interrupt to process latency (Ás): 75946.154715
    Average measured interrupt to process latency (Ás): 8.786541

    Highest measured interrupt to DPC latency (Ás): 74260.822879
    Average measured interrupt to DPC latency (Ás): 4.782860


    ____________________________________________________________________________________________________ _____
    REPORTED ISRs
    ____________________________________________________________________________________________________ _____
    Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

    Highest ISR routine execution time (Ás): 105.132813
    Driver with highest ISR routine execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

    Highest reported total ISR routine time (%): 0.033725
    Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

    Total time spent in ISRs (%) 0.033726

    ISR count (execution time <250 Ás): 405738
    ISR count (execution time 250-500 Ás): 0
    ISR count (execution time 500-999 Ás): 0
    ISR count (execution time 1000-1999 Ás): 0
    ISR count (execution time 2000-3999 Ás): 0
    ISR count (execution time >=4000 Ás): 0


    ____________________________________________________________________________________________________ _____
    REPORTED DPCs
    ____________________________________________________________________________________________________ _____
    DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

    Highest DPC routine execution time (Ás): 64763.179688
    Driver with highest DPC routine execution time: ndis.sys - Network Driver Interface Specification (NDIS), Microsoft Corporation

    Highest reported total DPC routine time (%): 0.586483
    Driver with highest DPC total execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

    Total time spent in DPCs (%) 1.143568

    DPC count (execution time <250 Ás): 3934747
    DPC count (execution time 250-500 Ás): 0
    DPC count (execution time 500-999 Ás): 4763
    DPC count (execution time 1000-1999 Ás): 151
    DPC count (execution time 2000-3999 Ás): 1095
    DPC count (execution time >=4000 Ás): 0


    ____________________________________________________________________________________________________ _____
    REPORTED HARD PAGEFAULTS
    ____________________________________________________________________________________________________ _____
    Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.


    Process with highest pagefault count: none

    Total number of hard pagefaults 0
    Hard pagefault count of hardest hit process: 0
    Highest hard pagefault resolution time (Ás): 0.0
    Total time spent in hard pagefaults (%): 0.0
    Number of processes hit: 0


    ____________________________________________________________________________________________________ _____
    PER CPU DATA
    ____________________________________________________________________________________________________ _____
    CPU 0 Interrupt cycle time (s): 48.232684
    CPU 0 ISR highest execution time (Ás): 95.488715
    CPU 0 ISR total execution time (s): 0.721241
    CPU 0 ISR count: 230747
    CPU 0 DPC highest execution time (Ás): 64763.179688
    CPU 0 DPC total execution time (s): 31.977599
    CPU 0 DPC count: 3560952
    ____________________________________________________________________________________________________ _____
    CPU 1 Interrupt cycle time (s): 24.089196
    CPU 1 ISR highest execution time (Ás): 105.132813
    CPU 1 ISR total execution time (s): 0.515896
    CPU 1 ISR count: 174985
    CPU 1 DPC highest execution time (Ás): 28784.198785
    CPU 1 DPC total execution time (s): 5.299618
    CPU 1 DPC count: 152982
    ____________________________________________________________________________________________________ _____
    CPU 2 Interrupt cycle time (s): 12.957132
    CPU 2 ISR highest execution time (Ás): 5.555556
    CPU 2 ISR total execution time (s): 0.000017
    CPU 2 ISR count: 6
    CPU 2 DPC highest execution time (Ás): 19072.513889
    CPU 2 DPC total execution time (s): 3.140433
    CPU 2 DPC count: 164741
    ____________________________________________________________________________________________________ _____
    CPU 3 Interrupt cycle time (s): 12.520489
    CPU 3 ISR highest execution time (Ás): 0.0
    CPU 3 ISR total execution time (s): 0.0
    CPU 3 ISR count: 0
    CPU 3 DPC highest execution time (Ás): 19002.136285
    CPU 3 DPC total execution time (s): 1.531277
    CPU 3 DPC count: 62538
    Attached Thumbnails Attached Thumbnails latmon 1.png   latmon 2.png  
      My ComputerSystem Spec

  2.    31 Dec 2017 #2

    Hi, I note your Windows build is older- 15063. There was at one point an update said to resolve a problem like this some were experiencing- I can't find or recall which it was, but a year or so ago perhaps. Are you up to date with current updates for your build?

    You may like to search this forum for 'crackle' - you will find a number of threads.

    Also see:
    Audio or Sound Popping on Windows 10/7 [Solved] - Driver Easy
    Speakers Crackling since Windows 10 update - Microsoft Community
    How to Fix Crackling or Popping Sound on a Windows PC
      My ComputerSystem Spec

  3.    01 Jan 2018 #3

    I have had this same issue for ages, no help about other than the usual - update everything. It doesn't work. There is definitely a conflict somewhere between the sound driver and network drivers NDIS and TCIP. Who knows how to fix it, i dont know. I have looked for ages.
      My ComputerSystem Spec

  4.    02 Jan 2018 #4

    Seems a number of reports for Acers.. anything on Acer's forum?
    These just for illustration- there'll be a lot of reports and no solution, I'd guess..
    https://www.google.co.uk/search?q=Ac...Cc3AgAT4mIHwBQ
    Acer Aspire E-15 Crackling Sound. ÔÇö Digital Spy
    Cracking Sounds in Acer Aspire E15 E5-575-33BM laptop ÔÇö Acer Community

    Try using an older version of your network driver. (Can you roll it back in Device Manager?)
    If that works you will need to protect it from being replaced by a driver update.

    Basics: try:
    Hide or Show Windows Updates in Windows 10 Windows Update Activation Tutorials
      My ComputerSystem Spec


 

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