DPC Latency Issues

thewisdomp

Honorable
Jul 18, 2013
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10,710
I have been trying to use my laptop for recording (Sager NP8270) with my audio interface (Scarlett 2i4) and the unit keeps dropping out or restarting while im trying to use it. I believe its because of DPC latency issues. I ran the LatencyMon ill put the report below. Can anyone help me resolve this issue?

SYSTEM INFORMATION
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Computer name: BEAST-MODE
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: P17SM , Notebook
CPU: GenuineIntel Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Logical processors: 8
Processor groups: 1
RAM: 16303 MB total


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CPU SPEED
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Reported CPU speed: 2394.0 MHz
Measured CPU speed: 2504.0 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): 725.302405
Average measured interrupt to process latency (µs): 11.529232

Highest measured interrupt to DPC latency (µs): 228.795275
Average measured interrupt to DPC latency (µs): 1.564820


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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): 56.401003
Driver with highest ISR routine execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation

Highest reported total ISR routine time (%): 0.056920
Driver with highest ISR total time: USBPORT.SYS - USB 1.1 & 2.0 Port Driver, Microsoft Corporation

Total time spent in ISRs (%) 0.060512

ISR count (execution time <250 µs): 83403
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): 455.839599
Driver with highest DPC routine execution time: USBPORT.SYS - USB 1.1 & 2.0 Port Driver, Microsoft Corporation

Highest reported total DPC routine time (%): 0.390296
Driver with highest DPC total execution time: USBPORT.SYS - USB 1.1 & 2.0 Port Driver, Microsoft Corporation

Total time spent in DPCs (%) 1.041441

DPC count (execution time <250 µs): 907330
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 924
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: taskhostex.exe

Total number of hard pagefaults 135
Hard pagefault count of hardest hit process: 100
Highest hard pagefault resolution time (µs): 4358.481203
Total time spent in hard pagefaults (%): 0.002817
Number of processes hit: 4