Windows 10: High DPC/ ISR Latency

Discus and support High DPC/ ISR Latency in Windows 10 BSOD Crashes and Debugging to solve the problem; Hello community, So by way of background, for a while now I have experienced issues regarding audio crackles and pops. This primarily occurs when... Discussion in 'Windows 10 BSOD Crashes and Debugging' started by Macl64, Jan 31, 2019.

  1. MACL64
    Macl64 Win User

    High DPC/ ISR Latency


    Hello community,


    So by way of background, for a while now I have experienced issues regarding audio crackles and pops. This primarily occurs when using Cubase 9.5 but also exists outside of the software too, occasionally. After searching for solutions, I came across LatencyMon and decided to start testing (the results of which can be found below). I should add that when trying it for the past few days, I have noticed that the 'Highest measured interrupt to process latency' changes between HDAudBus.sys and Wdf01000.sys.


    Steps I have taken so far:

    1) The first thing I did was simply to plug out all of the USB devices that were inserted in my computer one by one. One potentially notable piece of information is that I switched audio interface very recently - from the Focusrite 2i2 to the Audient iD4. However, I experienced these issues with my last audio interface too. This step produced no differences.


    2) I then, through device manager, disabled a huge variety of drivers one by one to see if there was a particular driver causing the issue. This primarily included network, audio and USB drivers. This step produced no differences.


    3) Following this I downloaded Driver Booster and tried to update all outdated drives, of which there were many. This step produced no differences.


    Pretty sure there were a few other minor things I have tried too such as disabling WiFi, antivirus and more. All produced no result.


    More than happy to provide more details if necessary. Any help is greatly appreciated.


    LatencyMon:

    _________________________________________________________________________________________________________

    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. 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 0:04:26 (h:mm:ss) on all processors.





    _________________________________________________________________________________________________________

    SYSTEM INFORMATION

    _________________________________________________________________________________________________________

    Computer name: DESKTOP-9TGICJA

    OS version: Windows 10 , 10.0, build: 17134 (x64)

    Hardware: N552VX, ASUSTeK COMPUTER INC.

    CPU: GenuineIntel Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz

    Logical processors: 4

    Processor groups: 1

    RAM: 12156 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 (µs): 2250.220222

    Average measured interrupt to process latency (µs): 5.684522



    Highest measured interrupt to DPC latency (µs): 2190.220275

    Average measured interrupt to DPC latency (µs): 2.232872





    _________________________________________________________________________________________________________

    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 (µs): 149.830729

    Driver with highest ISR routine execution time: HDAudBus.sys - High Definition Audio Bus Driver, Microsoft Corporation



    Highest reported total ISR routine time (%): 0.021921

    Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation



    Total time spent in ISRs (%) 0.023631



    ISR count (execution time <250 µs): 82832

    ISR count (execution time 250-500 µs): 0

    ISR count (execution time 500-999 µs): 0

    ISR count (execution time 1000-1999 µs): 0

    ISR count (execution time 2000-3999 µs): 0

    ISR count (execution time >=4000 µs): 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 (µs): 1638.547743

    Driver with highest DPC routine execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation



    Highest reported total DPC routine time (%): 0.562742

    Driver with highest DPC total execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation



    Total time spent in DPCs (%) 0.710236



    DPC count (execution time <250 µs): 944181

    DPC count (execution time 250-500 µs): 0

    DPC count (execution time 500-999 µs): 162

    DPC count (execution time 1000-1999 µs): 4

    DPC count (execution time 2000-3999 µs): 0

    DPC count (execution time >=4000 µs): 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.



    NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.



    Process with highest pagefault count: winword.exe



    Total number of hard pagefaults 643

    Hard pagefault count of hardest hit process: 323

    Number of processes hit: 18





    _________________________________________________________________________________________________________

    PER CPU DATA

    _________________________________________________________________________________________________________

    CPU 0 Interrupt cycle time (s): 17.051465

    CPU 0 ISR highest execution time (µs): 149.830729

    CPU 0 ISR total execution time (s): 0.251434

    CPU 0 ISR count: 82832

    CPU 0 DPC highest execution time (µs): 1638.547743

    CPU 0 DPC total execution time (s): 7.498538

    CPU 0 DPC count: 938734

    _________________________________________________________________________________________________________

    CPU 1 Interrupt cycle time (s): 6.104686

    CPU 1 ISR highest execution time (µs): 0.0

    CPU 1 ISR total execution time (s): 0.0

    CPU 1 ISR count: 0

    CPU 1 DPC highest execution time (µs): 227.875868

    CPU 1 DPC total execution time (s): 0.026960

    CPU 1 DPC count: 2310

    _________________________________________________________________________________________________________

    CPU 2 Interrupt cycle time (s): 5.310433

    CPU 2 ISR highest execution time (µs): 0.0

    CPU 2 ISR total execution time (s): 0.0

    CPU 2 ISR count: 0

    CPU 2 DPC highest execution time (µs): 203.476563

    CPU 2 DPC total execution time (s): 0.009951

    CPU 2 DPC count: 1081

    _________________________________________________________________________________________________________

    CPU 3 Interrupt cycle time (s): 5.152465

    CPU 3 ISR highest execution time (µs): 0.0

    CPU 3 ISR total execution time (s): 0.0

    CPU 3 ISR count: 0

    CPU 3 DPC highest execution time (µs): 279.683160

    CPU 3 DPC total execution time (s): 0.021462

    CPU 3 DPC count: 2222

    _________________________________________________________________________________________________________

    :)
     
    Macl64, Jan 31, 2019
    #1
  2. DONNIEADLER
    donnieadler Win User

    Windows 10 High Dpc Latency

    _________________________________________________________________________________________________________

    CONCLUSION

    _________________________________________________________________________________________________________

    Your system appears to be suitable for handling real-time audio and other tasks without dropouts.

    LatencyMon has been analyzing your system for 0:00:34 (h:mm:ss) on all processors.

    _________________________________________________________________________________________________________

    SYSTEM INFORMATION

    _________________________________________________________________________________________________________

    Computer name: TOXIFY

    OS version: Windows 8 , 6.2, build: 9200 (x64)

    Hardware: All Series, ASUS, ASUSTeK COMPUTER INC., MAXIMUS VII HERO

    CPU: GenuineIntel Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz

    Logical processors: 8

    Processor groups: 1

    RAM: 16325 MB total

    _________________________________________________________________________________________________________

    CPU SPEED

    _________________________________________________________________________________________________________

    Reported CPU speed: 40 MHz

    Measured CPU speed: 17 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 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 (µs): 476.527045

    Average measured interrupt to process latency (µs): 22.071483

    Highest measured interrupt to DPC latency (µs): 453.130216

    Average measured interrupt to DPC latency (µs): 10.219612

    _________________________________________________________________________________________________________

    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 (µs): 95.002250

    Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

    Highest reported total ISR routine time (%): 0.088418

    Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

    Total time spent in ISRs (%) 0.091639

    ISR count (execution time <250 µs): 18208

    ISR count (execution time 250-500 µs): 0

    ISR count (execution time 500-999 µs): 0

    ISR count (execution time 1000-1999 µs): 0

    ISR count (execution time 2000-3999 µs): 0

    ISR count (execution time >=4000 µs): 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 (µs): 314.29850

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

    Highest reported total DPC routine time (%): 0.288840

    Driver with highest DPC total execution time: cmudaxp.sys - C-Media Audio WDM Driver, C-Media Inc

    Total time spent in DPCs (%) 0.834058

    DPC count (execution time <250 µs): 236473

    DPC count (execution time 250-500 µs): 0

    DPC count (execution time 500-999 µs): 17

    DPC count (execution time 1000-1999 µs): 0

    DPC count (execution time 2000-3999 µs): 0

    DPC count (execution time >=4000 µs): 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.

    NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

    Process with highest pagefault count: searchindexer.exe

    Total number of hard pagefaults 107

    Hard pagefault count of hardest hit process: 80

    Highest hard pagefault resolution time (µs): 10444.1780

    Total time spent in hard pagefaults (%): 0.012556

    Number of processes hit: 3

    _________________________________________________________________________________________________________

    PER CPU DATA

    _________________________________________________________________________________________________________

    CPU 0 Interrupt cycle time (s): 3.152745

    CPU 0 ISR highest execution time (µs): 95.002250

    CPU 0 ISR total execution time (s): 0.240482

    CPU 0 ISR count: 15864

    CPU 0 DPC highest execution time (µs): 312.2290

    CPU 0 DPC total execution time (s): 2.025879

    CPU 0 DPC count: 195597

    _________________________________________________________________________________________________________

    CPU 1 Interrupt cycle time (s): 0.145655

    CPU 1 ISR highest execution time (µs): 71.0830

    CPU 1 ISR total execution time (s): 0.007632

    CPU 1 ISR count: 1470

    CPU 1 DPC highest execution time (µs): 156.977750

    CPU 1 DPC total execution time (s): 0.032375

    CPU 1 DPC count: 4747

    _________________________________________________________________________________________________________

    CPU 2 Interrupt cycle time (s): 0.313203

    CPU 2 ISR highest execution time (µs): 2.45350

    CPU 2 ISR total execution time (s): 0.000049

    CPU 2 ISR count: 29

    CPU 2 DPC highest execution time (µs): 314.29850

    CPU 2 DPC total execution time (s): 0.166350

    CPU 2 DPC count: 30377

    _________________________________________________________________________________________________________

    CPU 3 Interrupt cycle time (s): 0.111494

    CPU 3 ISR highest execution time (µs): 4.445250

    CPU 3 ISR total execution time (s): 0.000530

    CPU 3 ISR count: 471

    CPU 3 DPC highest execution time (µs): 78.54750

    CPU 3 DPC total execution time (s): 0.003921

    CPU 3 DPC count: 545

    _________________________________________________________________________________________________________

    CPU 4 Interrupt cycle time (s): 0.175799

    CPU 4 ISR highest execution time (µs): 2.2550

    CPU 4 ISR total execution time (s): 0.000035

    CPU 4 ISR count: 23

    CPU 4 DPC highest execution time (µs): 101.90950

    CPU 4 DPC total execution time (s): 0.012382

    CPU 4 DPC count: 1404

    _________________________________________________________________________________________________________

    CPU 5 Interrupt cycle time (s): 0.110466

    CPU 5 ISR highest execution time (µs): 5.3840

    CPU 5 ISR total execution time (s): 0.000311

    CPU 5 ISR count: 209

    CPU 5 DPC highest execution time (µs): 93.5640

    CPU 5 DPC total execution time (s): 0.004549

    CPU 5 DPC count: 543

    _________________________________________________________________________________________________________

    CPU 6 Interrupt cycle time (s): 0.150359

    CPU 6 ISR highest execution time (µs): 2.923750

    CPU 6 ISR total execution time (s): 0.000031

    CPU 6 ISR count: 18

    CPU 6 DPC highest execution time (µs): 75.430

    CPU 6 DPC total execution time (s): 0.017617

    CPU 6 DPC count: 2617

    _________________________________________________________________________________________________________

    CPU 7 Interrupt cycle time (s): 0.108249

    CPU 7 ISR highest execution time (µs): 5.0440

    CPU 7 ISR total execution time (s): 0.000189

    CPU 7 ISR count: 124

    CPU 7 DPC highest execution time (µs): 71.406750

    CPU 7 DPC total execution time (s): 0.005565

    CPU 7 DPC count: 660

    _________________________________________________________________________________________________________
     
    donnieadler, Jan 31, 2019
    #2
  3. IGOR LEYKO
    Igor Leyko Win User
    Windows 10 - High DPC Latency And ISR Cause Audio Dropouts And Lag

    In most cases high DPC latencies occurs due to hardware problems or incorrect drivers. Please, double-check you have installed not the newest but correct drivers. There is third-party utility DPC Latency Checker to help diagnose problem/u
     
    Igor Leyko, Jan 31, 2019
    #3
  4. SPIRITX MS MVP
    SpiritX MS MVP Win User

    High DPC/ ISR Latency

    DPC Latency High

    Hi,

    Check these:

    Solving DPC Latency Issues - Download Latency Monitor and DPC Latency Checker

    Solving DPC Latency Issues | Sweetwater

    DPC Latency Checker

    Troubleshoot Driver Problems Using DPC Latency Checker - Windows Tutorials

    DPC Latency Checker - Download

    DPC Latency Checker

    Hope this helps.

    --------------------------------------------------------------------------------------------

    Rob Brown -
    Microsoft MVP     <- profile - Windows and Devices for IT : Bicycle - Mark Twain said it right.
     
    SpiritX MS MVP, Jan 31, 2019
    #4
Thema:

High DPC/ ISR Latency

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