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Dpc Latency Windows7 64Bits

Tags:
  • Latency
  • CPUs
  • Windows 7
Last response: in CPUs
May 13, 2013 11:47:35 AM

This is my little dpc latency problem and that I get
not how to solve?


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 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 0:03:19 (h:mm:ss) on all processors.


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SYSTEM INFORMATION
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Computer name: GAME-PC
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
Hardware: H61H2-CM, ECS
CPU: GenuineIntel Intel(R) Pentium(R) CPU G620 @ 2.60GHz
Logical processors: 2
Processor groups: 1
RAM: 4078 MB total


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CPU SPEED
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Reported CPU speed: 2594,0 MHz
Measured CPU speed: 1721,0 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 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): 22783,100291
Average measured interrupt to process latency (µs): 4,614457

Highest measured interrupt to DPC latency (µs): 321,705997
Average measured interrupt to DPC latency (µs): 0,825359


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MEASURED SMI, IPI AND CPU STALLS
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The SMI, IPI and CPU stalls value represents the highest measured interval that a CPU did not respond while having its maskable interrupts disabled.

Highest measured SMI or CPU stall (µs) 12,631401


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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): 79,784117
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Highest reported total ISR routine time (%): 0,161188
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Total time spent in ISRs (%) 0,373066

ISR count (execution time <250 µs): 371580
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


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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): 331,730146
Driver with highest DPC routine execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 320.00 , NVIDIA Corporation

Highest reported total DPC routine time (%): 0,259693
Driver with highest DPC total execution time: ataport.SYS - ATAPI Driver Extension, Microsoft Corporation

Total time spent in DPCs (%) 0,829025

DPC count (execution time <250 µs): 1175697
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 28
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: svchost.exe

Total number of hard pagefaults 1127
Hard pagefault count of hardest hit process: 668
Highest hard pagefault resolution time (µs): 515880,016191
Total time spent in hard pagefaults (%): 7,070723
Number of processes hit: 7


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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 5,723175
CPU 0 ISR highest execution time (µs): 79,784117
CPU 0 ISR total execution time (s): 1,490936
CPU 0 ISR count: 371580
CPU 0 DPC highest execution time (µs): 331,730146
CPU 0 DPC total execution time (s): 3,209313
CPU 0 DPC count: 1155851
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CPU 1 Interrupt cycle time (s): 0,943474
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): 118,169622
CPU 1 DPC total execution time (s): 0,103837
CPU 1 DPC count: 19874
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More about : dpc latency windows7 64bits

a c 345 $ Windows 7
a c 243 à CPUs
May 20, 2013 6:55:58 AM

First, ensure that your BIOS is up to date. Also, verify that your chipset and video drivers are up to date as well.

Second, why are you measuring this stuff anyway? Are you experiencing a specific issue that you are trying to resolve?

Last, what, if anything (CPU, GPU, memory) are you overclocking?
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