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Very High DPC Latency RRS feed

  • General discussion

  • I've been searching for months, i haven't found a solution. I have a dell 14r, and i've got very high dpc latency, i've disabled Intel speed step, i don't know if it was the cause, but helped a little, but a still have some high DPC.

    here's the DPC  Conclusion

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    CONCLUSION
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    Your system seems to have difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. 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  0:00:50  (h:mm:ss) on all processors.


    _________________________________________________________________________________________________________
    SYSTEM INFORMATION
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    Computer name:                                        ALEF
    OS version:                                           Windows 8 , 6.2, build: 9200 (x64)
    Hardware:                                             Inspiron 5437, Dell Inc., 01PN4H
    CPU:                                                  GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz
    Logical processors:                                   4
    Processor groups:                                     1
    RAM:                                                  6048 MB total


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    CPU SPEED
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    Reported CPU speed:                                   1596,0 MHz
    Measured CPU speed:                                   180,0 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.

    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. 



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    MEASURED INTERRUPT TO USER PROCESS LATENCIES
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    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):   1572,913052
    Average measured interrupt to process latency (µs):   22,366048

    Highest measured interrupt to DPC latency (µs):       1565,856753
    Average measured interrupt to DPC latency (µs):       11,824275


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     REPORTED ISRs
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    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):              364,749373
    Driver with highest ISR routine execution time:       ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation

    Highest reported total ISR routine time (%):          0,106754
    Driver with highest ISR total time:                   ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation

    Total time spent in ISRs (%)                          0,133510

    ISR count (execution time <250 µs):                   21131
    ISR count (execution time 250-500 µs):                0
    ISR count (execution time 500-999 µs):                3
    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
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    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):              747,735589
    Driver with highest DPC routine execution time:       ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation

    Highest reported total DPC routine time (%):          0,297310
    Driver with highest DPC total execution time:         ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation

    Total time spent in DPCs (%)                          0,652473

    DPC count (execution time <250 µs):                   263660
    DPC count (execution time 250-500 µs):                0
    DPC count (execution time 500-999 µs):                253
    DPC count (execution time 1000-1999 µs):              0
    DPC count (execution time 2000-3999 µs):              0
    DPC count (execution time >=4000 µs):                 0


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     REPORTED HARD PAGEFAULTS
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    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:                 explorer.exe

    Total number of hard pagefaults                       1115
    Hard pagefault count of hardest hit process:          493
    Highest hard pagefault resolution time (µs):          12225544,827694
    Total time spent in hard pagefaults (%):              247,355044
    Number of processes hit:                              22


    _________________________________________________________________________________________________________
     PER CPU DATA
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    CPU 0 Interrupt cycle time (s):                       0,761402
    CPU 0 ISR highest execution time (µs):                331,166667
    CPU 0 ISR total execution time (s):                   0,090588
    CPU 0 ISR count:                                      7756
    CPU 0 DPC highest execution time (µs):                678,561404
    CPU 0 DPC total execution time (s):                   0,432507
    CPU 0 DPC count:                                      129558
    _________________________________________________________________________________________________________
    CPU 1 Interrupt cycle time (s):                       1,093584
    CPU 1 ISR highest execution time (µs):                364,749373
    CPU 1 ISR total execution time (s):                   0,177768
    CPU 1 ISR count:                                      13378
    CPU 1 DPC highest execution time (µs):                650,636591
    CPU 1 DPC total execution time (s):                   0,566066
    CPU 1 DPC count:                                      21399
    _________________________________________________________________________________________________________
    CPU 2 Interrupt cycle time (s):                       1,091097
    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):                747,735589
    CPU 2 DPC total execution time (s):                   0,292306
    CPU 2 DPC count:                                      112231
    _________________________________________________________________________________________________________
    CPU 3 Interrupt cycle time (s):                       0,461547
    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):                338,436090
    CPU 3 DPC total execution time (s):                   0,020591
    CPU 3 DPC count:                                      725
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    Thursday, February 27, 2014 1:24 PM

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