Windows 8 and 8.1 Forums

usbport.sys causes very high DPC ,wifi adapter ?

  1. #1

    Posts : 1
    Windows 8.1

    usbport.sys causes very high DPC ,wifi adapter ?

    Greetings everyone..

    So this has been an unending nightmare, it all started when i noticed that there are annoying sound lag spikes while playing music/movies/games etc... i searched until i found a program called LatencyMon, tried it and here's the result :
    Click image for larger version

    Click image for larger version

    Your system appears to be suitable for handling real-time audio and other tasks without dropouts. 
    LatencyMon has been analyzing your system for  0:03:02  (h:mm:ss) on all processors.
    Computer name:                                        MA
    OS version:                                           Windows 8 , 6.2, build: 9200 (x64)
    Hardware:                                             INTEL_, Intel Corporation, DG41RQ
    CPU:                                                  GenuineIntel Pentium(R) Dual-Core CPU E5200 @ 2.50GHz
    Logical processors:                                   2
    Processor groups:                                     1
    RAM:                                                  4091 MB total
    Reported CPU speed:                                   2500.0 MHz
    Measured CPU speed:                                   2009.0 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.
    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):   236.343096
    Average measured interrupt to process latency (Ás):   4.108497
    Highest measured interrupt to DPC latency (Ás):       189.647927
    Average measured interrupt to DPC latency (Ás):       1.300708
    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):              36.69480
    Driver with highest ISR routine execution time:       ataport.SYS - ATAPI Driver Extension, Microsoft Corporation
    Highest reported total ISR routine time (%):          0.041797
    Driver with highest ISR total time:                   USBPORT.SYS - USB 1.1 & 2.0 Port Driver, Microsoft Corporation
    Total time spent in ISRs (%)                          0.093575
    ISR count (execution time <250 Ás):                   82684
    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
    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):              387.810
    Driver with highest DPC routine execution time:       ndis.sys - Network Driver Interface Specification (NDIS), Microsoft Corporation
    Highest reported total DPC routine time (%):          0.234799
    Driver with highest DPC total execution time:         USBPORT.SYS - USB 1.1 & 2.0 Port Driver, Microsoft Corporation
    Total time spent in DPCs (%)                          0.848810
    DPC count (execution time <250 Ás):                   734263
    DPC count (execution time 250-500 Ás):                0
    DPC count (execution time 500-999 Ás):                3
    DPC count (execution time 1000-1999 Ás):              0
    DPC count (execution time 2000-3999 Ás):              0
    DPC count (execution time >=4000 Ás):                 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.
    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:                 mom.exe
    Total number of hard pagefaults                       26
    Hard pagefault count of hardest hit process:          7
    Highest hard pagefault resolution time (Ás):          22682.44520
    Total time spent in hard pagefaults (%):              0.040821
    Number of processes hit:                              8
    CPU 0 Interrupt cycle time (s):                       4.230762
    CPU 0 ISR highest execution time (Ás):                36.69480
    CPU 0 ISR total execution time (s):                   0.168463
    CPU 0 ISR count:                                      41269
    CPU 0 DPC highest execution time (Ás):                387.810
    CPU 0 DPC total execution time (s):                   1.780668
    CPU 0 DPC count:                                      594948
    CPU 1 Interrupt cycle time (s):                       2.620244
    CPU 1 ISR highest execution time (Ás):                21.82520
    CPU 1 ISR total execution time (s):                   0.172181
    CPU 1 ISR count:                                      41415
    CPU 1 DPC highest execution time (Ás):                246.70520
    CPU 1 DPC total execution time (s):                   1.309273
    CPU 1 DPC count:                                      139318
    Used to tell me that i was having problems in the report but i stopped just before i wanted to post this thread...weird.
    After disabling wifi adapter :

    Click image for larger version

    Although even after doing that i still get the same voice lag....

    I'm using TP-LINK TL-WN321G wi fi adapter, tried using another one but the problem remainds..

    Using 2 old routers, one is which a d-link 502t which doesn't have wireless, and the other is a linksys wag354g access point, both connected with eachother, been using them since forever and that problem didn't happen before so i don't think that's the problem here...
    Last edited by Zeus; 22 May 2015 at 06:43.

      My System SpecsSystem Spec

usbport.sys causes very high DPC ,wifi adapter ?
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