Yet another DPC latency issue - Win 10 x 64 Pro - build 1803

  1. Posts : 2
    10 x 64 Pro, 1803
       15 May 2018 #1

    Yet another DPC latency issue - Win 10 x 64 Pro - build 1803

    Hi all,

    Following a fresh reinstall it seems I am now in the same position as many before me - high DPC latency causing audio crackling, popping and distortion (especially in Kodi :-( )

    I've read everything I can find online and yet I'm still suffering this issue.

    This is a fresh install of windows 10 x64 Pro RS 4 on a Dell Inspiron 15r se (7520).

    Accordingly to Latencymon the high DPC latency is being caused by ndis.sys. The ISR is down to i8042prt.sys which is the driver for my laptop keypad.

    The issue with DPC does go away if I disable the Wireless NIC (Intel Centrino N 2230) but I need the wireless option. I have tried the all available drivers for the Centrino N 2230, none seem to make any difference.

    I have power settings to max and 100% cpu usage min / max with no sleep on wifi and no power control on usb etc.

    I've set the /tick and done a tcp optimizer.

    Its work pointing out that I have ghosted a clean fresh windows 10 install so I can restore and test drivers at any time.

    any thoughts?? Latencymon results are included below. The annoying thing is that I had no issue before I decided to rebuild to RS4. And yes I have tried going back to RS3, I even did a low level format for the sake of cleanness.



    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  3:22:42  (h:mm:ss) on all processors.
    Computer name:                                        DESKTOP-KTUQ4O5
    OS version:                                           Windows 10 , 10.0, build: 17134 (x64)
    Hardware:                                             Inspiron 7520, Dell Inc., 0PXH02
    CPU:                                                  GenuineIntel Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
    Logical processors:                                   4
    Processor groups:                                     1
    RAM:                                                  8067 MB total
    Reported CPU speed:                                   2594 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.
    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 (s):   32653.974763
    Average measured interrupt to process latency (s):   4.988388
    Highest measured interrupt to DPC latency (s):       32650.816853
    Average measured interrupt to DPC latency (s):       1.423473
    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):              70.555513
    Driver with highest ISR routine execution time:       i8042prt.sys - i8042 Port Driver, Microsoft Corporation
    Highest reported total ISR routine time (%):          0.001164
    Driver with highest ISR total time:                   i8042prt.sys - i8042 Port Driver, Microsoft Corporation
    Total time spent in ISRs (%)                          0.001631
    ISR count (execution time <250 s):                   98150
    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
    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):              32673.097147
    Driver with highest DPC routine execution time:       ndis.sys - Network Driver Interface Specification (NDIS), Microsoft Corporation
    Highest reported total DPC routine time (%):          0.068011
    Driver with highest DPC total execution time:         rspLLL64.sys - Resplendence Latency Monitoring and Auxiliary Kernel Library, Resplendence Software Projects Sp.
    Total time spent in DPCs (%)                          0.160623
    DPC count (execution time <250 s):                   31936928
    DPC count (execution time 250-500 s):                0
    DPC count (execution time 500-999 s):                9952
    DPC count (execution time 1000-1999 s):              451
    DPC count (execution time 2000-3999 s):              1465
    DPC count (execution time >=4000 s):                 0
    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
    CPU 0 Interrupt cycle time (s):                       169.367235
    CPU 0 ISR highest execution time (s):                70.555513
    CPU 0 ISR total execution time (s):                   0.728034
    CPU 0 ISR count:                                      63287
    CPU 0 DPC highest execution time (s):                32673.097147
    CPU 0 DPC total execution time (s):                   70.350211
    CPU 0 DPC count:                                      31346530
    CPU 1 Interrupt cycle time (s):                       168.380218
    CPU 1 ISR highest execution time (s):                56.564765
    CPU 1 ISR total execution time (s):                   0.054377
    CPU 1 ISR count:                                      27345
    CPU 1 DPC highest execution time (s):                9794.580185
    CPU 1 DPC total execution time (s):                   0.973163
    CPU 1 DPC count:                                      102504
    CPU 2 Interrupt cycle time (s):                       88.552004
    CPU 2 ISR highest execution time (s):                29.897070
    CPU 2 ISR total execution time (s):                   0.003656
    CPU 2 ISR count:                                      2980
    CPU 2 DPC highest execution time (s):                12137.331534
    CPU 2 DPC total execution time (s):                   5.617731
    CPU 2 DPC count:                                      365166
    CPU 3 Interrupt cycle time (s):                       170.194935
    CPU 3 ISR highest execution time (s):                53.047417
    CPU 3 ISR total execution time (s):                   0.007475
    CPU 3 ISR count:                                      4538
    CPU 3 DPC highest execution time (s):                11446.78990
    CPU 3 DPC total execution time (s):                   1.201150
    CPU 3 DPC count:                                      135514
    Attached Thumbnails Attached Thumbnails screen.jpg  
    Last edited by Brink; 15 May 2018 at 12:26. Reason: code box
      My ComputerSystem Spec

  2.    15 May 2018 #2

    Wi-Fi is a known cause of your problem. However, I have a Dell Inspiron 15, 5577 model. I bought it mainly to use in my recording studio for on-site recordings (using Cakewalk Sonar or Studio One 3 Pro recording software). I worked on getting the PC configured for recording but still had dropouts and DPC Latency. It came with an M.2 SSD and space for an added hard drive or SSD. I Installed a spare SSD I had and made it a dual boot, the original Dell image and a second with Win 10, necessary drivers and my recording software and nothing else. If I want regular PC use I boot to the Dell M.2 image. If I want to use it for recording, I boot to the recording image.
      My ComputersSystem Spec

  3. Posts : 2
    10 x 64 Pro, 1803
    Thread Starter
       16 May 2018 #3

    I've now tried windows 8.1 and windows 7 - both are giving the same dropouts and high DPC. I'm starting to think it might be a hardware issue. To be fair I had the laptop apart a few weeks back to clean the dust out (as I've done every couple of years). If I damaged or didnt reseat the pci-e cables correctly could it cause this kind of issue? I'll try taking it apart again at the weekend and take another look.
      My ComputerSystem Spec

  4.    16 May 2018 #4

    I wouldn't think cleaning it caused the problems. But, check everything just in case.
    Since the problem goes away when you disable Wi-Fi, do you have the latest driver for the Wi-Fi?

    Did this work OK at one time?
    My Inspiron laptop had DPC latency dropouts from the time it was new and tweaking and disabling thing would not fix it. Its a 2017 model, designed for Win 10.
      My ComputersSystem Spec


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