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High DPC latency!
Hi!
I have problem with latency! I have Sony Vaio VPCF12M1E/H laptop with Samsung SSD.
Current OS is Windows 7 x64.
In last two days i have reinstalled OS three times! And still no success.
I have tried running LatencyMon with default OS (microsoft) drivers and with latest drivers from manufacturer.
I have tried to disable many devices in device manager step by step but the problem is still here.
So i guess its not software... Am i right?
It is very annoying! And i cant use this laptop like that! If i watch youtube i hear "clicks & pops" every few seconds. Annoying!
Is there any way to solve this problem?
One example:
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CONCLUSION
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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 0:32:55 (h:mm:ss) on all processors in the system.
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SYSTEM INFORMATION
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Computer name: TOM-PC
OS version: Windows 7 , 6.1, build: 7600 (x64)
CPU: GenuineIntel Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz
Logical processors: 4
Processor groups: 1
RAM: 4014 MB total
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CPU SPEED
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Reported CPU speed: 2394,0 MHz
Measured CPU speed: 1715,0 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.
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MEASURED KERNEL TIMER LATENCIES
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Highest measured kernel timer latency (µs): 38332,052291
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MEASURED SMIs AND CPU STALLS
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Highest measured SMI, IPI or CPU stall (µs) 164,247228
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REPORTED DPCs
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Highest DPC routine execution time (µs): 40791,541353
Driver with highest DPC routine execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 306.97 , NVIDIA Corporation
Highest reported total DPC routine time (%): 0,392327
Driver with highest DPC total execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 306.97 , NVIDIA Corporation
Total time spent in DPCs (%) 0,727341
DPC count (execution time <250 µs): 2636063
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 3670
DPC count (execution time 1000-1999 µs): 11399
DPC count (execution time 2000-3999 µs): 38
DPC count (execution time >=4000 µs): 0
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REPORTED ISRs
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Highest ISR routine execution time (µs): 599,203008
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation
Highest reported total ISR routine time (%): 0,263908
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation
Total time spent in ISRs (%) 0,660763
ISR count (execution time <250 µs): 3789114
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 41
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0
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REPORTED HARD PAGEFAULTS
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Process with highest pagefault count: none
Total number of hard pagefaults 14932
Hard pagefault count of hardest hit process: 7951
Highest hard pagefault resolution time (µs): 150963,956140
Total time spent in hard pagefaults (%): 0,129215
Number of processes hit: 0
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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 39,917208
CPU 0 ISR highest execution time (µs): 353,326232
CPU 0 ISR total execution time (s): 15,873429
CPU 0 ISR count: 2424442
CPU 0 DPC highest execution time (µs): 2063,013367
CPU 0 DPC total execution time (s): 19,080266
CPU 0 DPC count: 1452965
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CPU 1 Interrupt cycle time (s): 27,105590
CPU 1 ISR highest execution time (µs): 548,0
CPU 1 ISR total execution time (s): 12,622868
CPU 1 ISR count: 455083
CPU 1 DPC highest execution time (µs): 40791,541353
CPU 1 DPC total execution time (s): 13,218109
CPU 1 DPC count: 361174
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CPU 2 Interrupt cycle time (s): 26,444516
CPU 2 ISR highest execution time (µs): 599,203008
CPU 2 ISR total execution time (s): 11,711346
CPU 2 ISR count: 455326
CPU 2 DPC highest execution time (µs): 5193,181704
CPU 2 DPC total execution time (s): 11,773562
CPU 2 DPC count: 401176
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CPU 3 Interrupt cycle time (s): 26,369461
CPU 3 ISR highest execution time (µs): 304,842105
CPU 3 ISR total execution time (s): 12,002229
CPU 3 ISR count: 454304
CPU 3 DPC highest execution time (µs): 11146,724311
CPU 3 DPC total execution time (s): 13,398563
CPU 3 DPC count: 435862
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