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Question DPC Latency

May 22, 2020
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I've been having lag and stuttering recently and I ran LatencyMon for a few hours and the main culprit seems to be ndis.sys I've already disabled HPET and updated BIOS but the stuttering is still here. I posted my LatencyMon report here

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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. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. 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 1:49:00 (h🇲🇲ss) on all processors.

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SYSTEM INFORMATION

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Computer name: LUV

OS version: Windows 10 , 10.0, build: 18363 (x64)

Hardware: MS-7A59, MSI, Z270 SLI (MS-7A59)

CPU: GenuineIntel Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz

Logical processors: 4

Processor groups: 1

RAM: 16343 MB total





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CPU SPEED

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Reported CPU speed: 3408 MHz



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): 5189.60

Average measured interrupt to process latency (µs): 3.250634



Highest measured interrupt to DPC latency (µs): 2473.30

Average measured interrupt to DPC latency (µs): 0.889044





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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): 202.303404

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



Highest reported total ISR routine time (%): 0.302628

Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation



Total time spent in ISRs (%) 0.360115



ISR count (execution time <250 µs): 8882219

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): 1974.732981

Driver with highest DPC routine execution time: CLASSPNP.SYS - SCSI Class System Dll, Microsoft Corporation



Highest reported total DPC routine time (%): 0.148444

Driver with highest DPC total execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation



Total time spent in DPCs (%) 0.369471



DPC count (execution time <250 µs): 25763111

DPC count (execution time 250-500 µs): 0

DPC count (execution time 500-999 µs): 39

DPC count (execution time 1000-1999 µs): 4

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: system



Total number of hard pagefaults 24371

Hard pagefault count of hardest hit process: 10632

Number of processes hit: 77





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PER CPU DATA

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CPU 0 Interrupt cycle time (s): 256.595174

CPU 0 ISR highest execution time (µs): 202.303404

CPU 0 ISR total execution time (s): 93.984784

CPU 0 ISR count: 8770859

CPU 0 DPC highest execution time (µs): 1974.732981

CPU 0 DPC total execution time (s): 90.242991

CPU 0 DPC count: 24591072

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CPU 1 Interrupt cycle time (s): 42.915269

CPU 1 ISR highest execution time (µs): 74.250587

CPU 1 ISR total execution time (s): 0.220349

CPU 1 ISR count: 110886

CPU 1 DPC highest execution time (µs): 1147.788732

CPU 1 DPC total execution time (s): 5.053666

CPU 1 DPC count: 745694

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CPU 2 Interrupt cycle time (s): 29.879141

CPU 2 ISR highest execution time (µs): 3.880282

CPU 2 ISR total execution time (s): 0.000891

CPU 2 ISR count: 474

CPU 2 DPC highest execution time (µs): 168.693075

CPU 2 DPC total execution time (s): 0.632594

CPU 2 DPC count: 205548

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CPU 3 Interrupt cycle time (s): 28.465742

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): 839.605634

CPU 3 DPC total execution time (s): 0.724334

CPU 3 DPC count: 220840

 

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