1. #1

    Horrific dpc latency

    My pc is a home build running windows 10 pro x64 insider preview 17025 and is around 5 years old. It has had a full os reinstall around 1 year ago also.



    My system is overclocked and fully prime stable, cpu is an i7 2600k running at 4.6ghz @ 1.325 volts


    trace.etl file is here

    trace.etl - Google Drive


    http://speccy.piriform.com/results/z...njboiVbuzynRQZ

    I am not using any antivirus etc apart from windows defender and malwarebytes

    Any more info needed i will reply asap

    Thanks
    Attached Files Attached Files


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  2. #2

    Re: Horrific dpc latency

    Ok i have added a latencymon to show what is happening


    CONCLUSION
    _________________________________________________________________________________________________________
    Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. 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 0:02:33 (h:mm:ss) on all processors.


    _________________________________________________________________________________________________________
    SYSTEM INFORMATION
    _________________________________________________________________________________________________________
    Computer name: EMPTY
    OS version: Windows 10 , 10.0, build: 17025 (x64)
    Hardware: ASUSTeK Computer INC., Maximus IV Extreme
    CPU: GenuineIntel Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
    Logical processors: 8
    Processor groups: 1
    RAM: 8159 MB total


    _________________________________________________________________________________________________________
    CPU SPEED
    _________________________________________________________________________________________________________
    Reported CPU speed: 340 MHz
    Measured CPU speed: 1 MHz (approx.)

    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.

    WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.



    _________________________________________________________________________________________________________
    MEASURED INTERRUPT TO DPC LATENCIES
    _________________________________________________________________________________________________________
    The interrupt to DPC latency reflects the measured interval in which a DPC could execute in response to a hardware request from the moment the interrupt service routine started execution.

    Highest measured interrupt to DPC latency (s): 1016.758444
    Average measured interrupt to DPC latency (s): 2.300401


    _________________________________________________________________________________________________________
    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 (s): 94.162941
    Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

    Highest reported total ISR routine time (%): 0.100008
    Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

    Total time spent in ISRs (%) 0.143692

    ISR count (execution time <250 s): 108659
    ISR count (execution time 250-500 s): 0
    ISR count (execution time 500-999 s): 0
    ISR count (execution time 1000-1999 s): 0
    ISR count (execution time 2000-3999 s): 0
    ISR count (execution time >=4000 s): 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 (s): 1036.519412
    Driver with highest DPC routine execution time: nusb3xhc.sys - USB 3.0 Host Controller Driver, Renesas Electronics Corporation

    Highest reported total DPC routine time (%): 0.064251
    Driver with highest DPC total execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 387.92 , NVIDIA Corporation

    Total time spent in DPCs (%) 0.117069

    DPC count (execution time <250 s): 593173
    DPC count (execution time 250-500 s): 0
    DPC count (execution time 500-999 s): 0
    DPC count (execution time 1000-1999 s): 4
    DPC count (execution time 2000-3999 s): 0
    DPC count (execution time >=4000 s): 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 (s): 0.0
    Total time spent in hard pagefaults (%): 0.0
    Number of processes hit: 0


    _________________________________________________________________________________________________________
    PER CPU DATA
    _________________________________________________________________________________________________________
    CPU 0 Interrupt cycle time (s): 7.003579
    CPU 0 ISR highest execution time (s): 94.162941
    CPU 0 ISR total execution time (s): 1.680139
    CPU 0 ISR count: 104426
    CPU 0 DPC highest execution time (s): 1036.519412
    CPU 0 DPC total execution time (s): 1.293210
    CPU 0 DPC count: 548259
    _________________________________________________________________________________________________________
    CPU 1 Interrupt cycle time (s): 0.357773
    CPU 1 ISR highest execution time (s): 71.534118
    CPU 1 ISR total execution time (s): 0.078611
    CPU 1 ISR count: 4225
    CPU 1 DPC highest execution time (s): 57.897647
    CPU 1 DPC total execution time (s): 0.041516
    CPU 1 DPC count: 4749
    _________________________________________________________________________________________________________
    CPU 2 Interrupt cycle time (s): 0.323814
    CPU 2 ISR highest execution time (s): 0.0
    CPU 2 ISR total execution time (s): 0.0
    CPU 2 ISR count: 0
    CPU 2 DPC highest execution time (s): 43.438235
    CPU 2 DPC total execution time (s): 0.023873
    CPU 2 DPC count: 10708
    _________________________________________________________________________________________________________
    CPU 3 Interrupt cycle time (s): 0.240277
    CPU 3 ISR highest execution time (s): 0.0
    CPU 3 ISR total execution time (s): 0.0
    CPU 3 ISR count: 0
    CPU 3 DPC highest execution time (s): 43.838235
    CPU 3 DPC total execution time (s): 0.004015
    CPU 3 DPC count: 1445
    _________________________________________________________________________________________________________
    CPU 4 Interrupt cycle time (s): 0.310094
    CPU 4 ISR highest execution time (s): 5.014706
    CPU 4 ISR total execution time (s): 0.000014
    CPU 4 ISR count: 3
    CPU 4 DPC highest execution time (s): 58.592353
    CPU 4 DPC total execution time (s): 0.025419
    CPU 4 DPC count: 10512
    _________________________________________________________________________________________________________
    CPU 5 Interrupt cycle time (s): 0.263439
    CPU 5 ISR highest execution time (s): 5.123529
    CPU 5 ISR total execution time (s): 0.000025
    CPU 5 ISR count: 5
    CPU 5 DPC highest execution time (s): 53.103529
    CPU 5 DPC total execution time (s): 0.009826
    CPU 5 DPC count: 3751
    _________________________________________________________________________________________________________
    CPU 6 Interrupt cycle time (s): 0.335318
    CPU 6 ISR highest execution time (s): 0.0
    CPU 6 ISR total execution time (s): 0.0
    CPU 6 ISR count: 0
    CPU 6 DPC highest execution time (s): 59.078235
    CPU 6 DPC total execution time (s): 0.030446
    CPU 6 DPC count: 12510
    _________________________________________________________________________________________________________
    CPU 7 Interrupt cycle time (s): 0.242996
    CPU 7 ISR highest execution time (s): 0.0
    CPU 7 ISR total execution time (s): 0.0
    CPU 7 ISR count: 0
    CPU 7 DPC highest execution time (s): 21.240
    CPU 7 DPC total execution time (s): 0.004617
    CPU 7 DPC count: 1243
    _________________________________________________________________________________________________________


    This was only run for a few seconds but it already show's bad latency, when i run longer it obviously get's lots worse

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