DPC/Latency Spikes

ScottyYDG · June 3, 2021

I have tried almost every forum imaginable at this point, save for the LTT forums. I have been dealing with an unsolvable latency issue that is observable in most games (most noticeably VR), and after a certain length of time it is also noticeable on the desktop. Almost any fix I have tried has been unsuccessful, be it altering PCIe lane speeds, updating bios, updating drivers, rolling back drivers, setting Windows to performance mode, editing registry (at the request of Nvidia support), and so far my only hope is to have someone who is knowledgeable in XPERF traces sift through the linked one to see which drivers are having issues, as that is seemingly what I have narrowed it down to. Hardware is a few months old, with no crashes, faults, etc, and performance is on par with what it should be (minus the stuttering). Below will be my LatencyMon readout, along with my specs, and the most recent trace where I was able to observe the stuttering through CPU frametime in VR.

AMD Ryzen 5950X [Stock]
Nvidia RTX 3080 FTW 3 Ultra [Stock]
4x 8GB 3200MHZ DDR4 TridentZ
MSI X570 Tomahawk WiFi
1x Samsung 2.5” 1TB SATA SSD
1x 2TB Seagate HDD
1x 6TB WD HDD
EVGA 750W Gold 80+ PSU

Trace: https://1drv.ms/u/s!AnT4XFCUGJYs-B7qxFL6ghh1VYCc?e=obeRiW

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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 1:12:21 (h:mm:ss) on all processors.

____________________________________________________________________________________________________ _____
SYSTEM INFORMATION
____________________________________________________________________________________________________ _____
Computer name: DESKTOP-3IMK363
OS version: Windows 10, 10.0, version 2009, build: 19043 (x64)
Hardware: MS-7C84, Micro-Star International Co., Ltd. (Bios: 1.63)
CPU: AuthenticAMD AMD Ryzen 9 5950X 16-Core Processor
Logical processors: 32
Processor groups: 1
RAM: 32692 MB total

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CPU SPEED
____________________________________________________________________________________________________ _____
Reported CPU speed: 340 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.

____________________________________________________________________________________________________ _____
MEASURED INTERRUPT TO USER PROCESS LATENCIES
____________________________________________________________________________________________________ _____
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): 497.30
Average measured interrupt to process latency (µs): 5.567518

Highest measured interrupt to DPC latency (µs): 491.20
Average measured interrupt to DPC latency (µs): 1.555345

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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): 171.810
Driver with highest ISR routine execution time: HDAudBus.sys - High Definition Audio Bus Driver, Microsoft Corporation

Highest reported total ISR routine time (%): 0.000036
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

Total time spent in ISRs (%) 0.000042

ISR count (execution time <250 µs): 119870
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-1000 µs): 0
ISR count (execution time 1000-2000 µs): 0
ISR count (execution time 2000-4000 µs): 0
ISR count (execution time >=4000 µs): 0

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REPORTED DPCs
____________________________________________________________________________________________________ _____
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): 3400.510
Driver with highest DPC routine execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 456.71 , NVIDIA Corporation

Highest reported total DPC routine time (%): 0.001298
Driver with highest DPC total execution time: afd.sys - Ancillary Function Driver for WinSock, Microsoft Corporation

Total time spent in DPCs (%) 0.004881

DPC count (execution time <250 µs): 2403095
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-10000 µs): 34
DPC count (execution time 1000-2000 µs): 0
DPC count (execution time 2000-4000 µs): 3
DPC count (execution time >=4000 µs): 0

____________________________________________________________________________________________________ _____
REPORTED HARD PAGEFAULTS
____________________________________________________________________________________________________ _____
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 581
Hard pagefault count of hardest hit process: 212
Number of processes hit: 27

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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 11.063476
CPU 0 ISR highest execution time (µs): 6.630
CPU 0 ISR total execution time (s): 0.000293
CPU 0 ISR count: 123
CPU 0 DPC highest execution time (µs): 94.590
CPU 0 DPC total execution time (s): 0.314120
CPU 0 DPC count: 163394
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CPU 1 Interrupt cycle time (s): 6.422759
CPU 1 ISR highest execution time (µs): 8.950
CPU 1 ISR total execution time (s): 0.000130
CPU 1 ISR count: 34
CPU 1 DPC highest execution time (µs): 55.20
CPU 1 DPC total execution time (s): 0.005305
CPU 1 DPC count: 2142
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CPU 2 Interrupt cycle time (s): 10.237052
CPU 2 ISR highest execution time (µs): 27.430
CPU 2 ISR total execution time (s): 0.002278
CPU 2 ISR count: 818
CPU 2 DPC highest execution time (µs): 455.590
CPU 2 DPC total execution time (s): 0.286156
CPU 2 DPC count: 56900
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CPU 3 Interrupt cycle time (s): 8.010791
CPU 3 ISR highest execution time (µs): 171.810
CPU 3 ISR total execution time (s): 0.007589
CPU 3 ISR count: 2783
CPU 3 DPC highest execution time (µs): 496.620
CPU 3 DPC total execution time (s): 0.174920
CPU 3 DPC count: 74074
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CPU 4 Interrupt cycle time (s): 7.257983
CPU 4 ISR highest execution time (µs): 2.650
CPU 4 ISR total execution time (s): 0.000099
CPU 4 ISR count: 131
CPU 4 DPC highest execution time (µs): 111.470
CPU 4 DPC total execution time (s): 0.034346
CPU 4 DPC count: 17773
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CPU 5 Interrupt cycle time (s): 7.034823
CPU 5 ISR highest execution time (µs): 1.470
CPU 5 ISR total execution time (s): 0.000007
CPU 5 ISR count: 8
CPU 5 DPC highest execution time (µs): 52.610
CPU 5 DPC total execution time (s): 0.008519
CPU 5 DPC count: 5096
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CPU 6 Interrupt cycle time (s): 8.447246
CPU 6 ISR highest execution time (µs): 4.060
CPU 6 ISR total execution time (s): 0.000771
CPU 6 ISR count: 927
CPU 6 DPC highest execution time (µs): 494.140
CPU 6 DPC total execution time (s): 0.309142
CPU 6 DPC count: 53809
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CPU 7 Interrupt cycle time (s): 7.490877
CPU 7 ISR highest execution time (µs): 5.890
CPU 7 ISR total execution time (s): 0.000755
CPU 7 ISR count: 910
CPU 7 DPC highest execution time (µs): 107.310
CPU 7 DPC total execution time (s): 0.122825
CPU 7 DPC count: 34325
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CPU 8 Interrupt cycle time (s): 9.712983
CPU 8 ISR highest execution time (µs): 3.260
CPU 8 ISR total execution time (s): 0.000652
CPU 8 ISR count: 853
CPU 8 DPC highest execution time (µs): 736.670
CPU 8 DPC total execution time (s): 0.090472
CPU 8 DPC count: 36438
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CPU 9 Interrupt cycle time (s): 11.022269
CPU 9 ISR highest execution time (µs): 3.0
CPU 9 ISR total execution time (s): 0.000612
CPU 9 ISR count: 1035
CPU 9 DPC highest execution time (µs): 3400.510
CPU 9 DPC total execution time (s): 0.143604
CPU 9 DPC count: 66613
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CPU 10 Interrupt cycle time (s): 18.110295
CPU 10 ISR highest execution time (µs): 7.260
CPU 10 ISR total execution time (s): 0.003473
CPU 10 ISR count: 7432
CPU 10 DPC highest execution time (µs): 3396.390
CPU 10 DPC total execution time (s): 0.422796
CPU 10 DPC count: 131116
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CPU 11 Interrupt cycle time (s): 44.335364
CPU 11 ISR highest execution time (µs): 6.680
CPU 11 ISR total execution time (s): 0.031564
CPU 11 ISR count: 82884
CPU 11 DPC highest execution time (µs): 3337.850
CPU 11 DPC total execution time (s): 3.472098
CPU 11 DPC count: 773806
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CPU 12 Interrupt cycle time (s): 6.447224
CPU 12 ISR highest execution time (µs): 1.830
CPU 12 ISR total execution time (s): 0.000109
CPU 12 ISR count: 245
CPU 12 DPC highest execution time (µs): 126.960
CPU 12 DPC total execution time (s): 0.021659
CPU 12 DPC count: 12051
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CPU 13 Interrupt cycle time (s): 6.251364
CPU 13 ISR highest execution time (µs): 0.980
CPU 13 ISR total execution time (s): 0.000007
CPU 13 ISR count: 11
CPU 13 DPC highest execution time (µs): 74.180
CPU 13 DPC total execution time (s): 0.004229
CPU 13 DPC count: 2453
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CPU 14 Interrupt cycle time (s): 5.656017
CPU 14 ISR highest execution time (µs): 1.20
CPU 14 ISR total execution time (s): 0.000037
CPU 14 ISR count: 77
CPU 14 DPC highest execution time (µs): 95.590
CPU 14 DPC total execution time (s): 0.027607
CPU 14 DPC count: 15987
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CPU 15 Interrupt cycle time (s): 6.592568
CPU 15 ISR highest execution time (µs): 1.570
CPU 15 ISR total execution time (s): 0.000020
CPU 15 ISR count: 40
CPU 15 DPC highest execution time (µs): 100.660
CPU 15 DPC total execution time (s): 0.021420
CPU 15 DPC count: 12825
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CPU 16 Interrupt cycle time (s): 6.095627
CPU 16 ISR highest execution time (µs): 1.070
CPU 16 ISR total execution time (s): 0.000082
CPU 16 ISR count: 101
CPU 16 DPC highest execution time (µs): 87.370
CPU 16 DPC total execution time (s): 0.011375
CPU 16 DPC count: 10246
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CPU 17 Interrupt cycle time (s): 5.997298
CPU 17 ISR highest execution time (µs): 1.770
CPU 17 ISR total execution time (s): 0.000049
CPU 17 ISR count: 80
CPU 17 DPC highest execution time (µs): 111.840
CPU 17 DPC total execution time (s): 0.011327
CPU 17 DPC count: 10100
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CPU 18 Interrupt cycle time (s): 8.163705
CPU 18 ISR highest execution time (µs): 6.220
CPU 18 ISR total execution time (s): 0.001926
CPU 18 ISR count: 3645
CPU 18 DPC highest execution time (µs): 451.10
CPU 18 DPC total execution time (s): 0.080026
CPU 18 DPC count: 61662
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CPU 19 Interrupt cycle time (s): 9.159196
CPU 19 ISR highest execution time (µs): 5.820
CPU 19 ISR total execution time (s): 0.003303
CPU 19 ISR count: 7785
CPU 19 DPC highest execution time (µs): 108.240
CPU 19 DPC total execution time (s): 0.129551
CPU 19 DPC count: 100342
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CPU 20 Interrupt cycle time (s): 11.391695
CPU 20 ISR highest execution time (µs): 4.490
CPU 20 ISR total execution time (s): 0.001113
CPU 20 ISR count: 1356
CPU 20 DPC highest execution time (µs): 104.950
CPU 20 DPC total execution time (s): 0.177056
CPU 20 DPC count: 64722
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CPU 21 Interrupt cycle time (s): 11.936780
CPU 21 ISR highest execution time (µs): 1.770
CPU 21 ISR total execution time (s): 0.000174
CPU 21 ISR count: 209
CPU 21 DPC highest execution time (µs): 258.210
CPU 21 DPC total execution time (s): 0.140646
CPU 21 DPC count: 52441
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CPU 22 Interrupt cycle time (s): 6.171439
CPU 22 ISR highest execution time (µs): 1.630
CPU 22 ISR total execution time (s): 0.000006
CPU 22 ISR count: 7
CPU 22 DPC highest execution time (µs): 84.160
CPU 22 DPC total execution time (s): 0.010407
CPU 22 DPC count: 9651
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CPU 23 Interrupt cycle time (s): 6.308361
CPU 23 ISR highest execution time (µs): 1.630
CPU 23 ISR total execution time (s): 0.000036
CPU 23 ISR count: 49
CPU 23 DPC highest execution time (µs): 107.860
CPU 23 DPC total execution time (s): 0.015672
CPU 23 DPC count: 14549
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CPU 24 Interrupt cycle time (s): 6.803407
CPU 24 ISR highest execution time (µs): 1.30
CPU 24 ISR total execution time (s): 0.000062
CPU 24 ISR count: 92
CPU 24 DPC highest execution time (µs): 104.050
CPU 24 DPC total execution time (s): 0.034354
CPU 24 DPC count: 31572
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CPU 25 Interrupt cycle time (s): 7.721994
CPU 25 ISR highest execution time (µs): 3.40
CPU 25 ISR total execution time (s): 0.000113
CPU 25 ISR count: 178
CPU 25 DPC highest execution time (µs): 105.980
CPU 25 DPC total execution time (s): 0.063375
CPU 25 DPC count: 59543
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CPU 26 Interrupt cycle time (s): 8.565343
CPU 26 ISR highest execution time (µs): 2.260
CPU 26 ISR total execution time (s): 0.000317
CPU 26 ISR count: 652
CPU 26 DPC highest execution time (µs): 120.580
CPU 26 DPC total execution time (s): 0.097797
CPU 26 DPC count: 88653
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CPU 27 Interrupt cycle time (s): 15.792242
CPU 27 ISR highest execution time (µs): 4.610
CPU 27 ISR total execution time (s): 0.002815
CPU 27 ISR count: 6941
CPU 27 DPC highest execution time (µs): 478.440
CPU 27 DPC total execution time (s): 0.460518
CPU 27 DPC count: 387283
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CPU 28 Interrupt cycle time (s): 6.720471
CPU 28 ISR highest execution time (µs): 2.870
CPU 28 ISR total execution time (s): 0.000091
CPU 28 ISR count: 125
CPU 28 DPC highest execution time (µs): 101.320
CPU 28 DPC total execution time (s): 0.018795
CPU 28 DPC count: 16504
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CPU 29 Interrupt cycle time (s): 6.446847
CPU 29 ISR highest execution time (µs): 1.070
CPU 29 ISR total execution time (s): 0.000009
CPU 29 ISR count: 11
CPU 29 DPC highest execution time (µs): 111.580
CPU 29 DPC total execution time (s): 0.017230
CPU 29 DPC count: 16114
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CPU 30 Interrupt cycle time (s): 8.738726
CPU 30 ISR highest execution time (µs): 2.120
CPU 30 ISR total execution time (s): 0.000178
CPU 30 ISR count: 223
CPU 30 DPC highest execution time (µs): 456.840
CPU 30 DPC total execution time (s): 0.037440
CPU 30 DPC count: 12142
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CPU 31 Interrupt cycle time (s): 7.700054
CPU 31 ISR highest execution time (µs): 1.440
CPU 31 ISR total execution time (s): 0.000069
CPU 31 ISR count: 105
CPU 31 DPC highest execution time (µs): 108.660
CPU 31 DPC total execution time (s): 0.015769
CPU 31 DPC count: 8806
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t.l. · June 30, 2022

i've had the same problemish i think?i'm trying to run any music programs to them becoming distorted. i've done everything possible. i've tried other pc aswell they work on them(intel). so maybe the problem is with the cpu?? here what my latecymon said. maybe it'll help get our problems fixed.

Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. 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 0:18:12 (h:mm:ss) on processors 0,1,2,3,4 and 5.

_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: NONYA
OS version: Windows 11, 10.0, version 2009, build: 22000 (x64)
Hardware: B450M Steel Legend, To Be Filled By O.E.M.
BIOS: P4.30
CPU: AuthenticAMD AMD Ryzen 5 2600 Six-Core Processor
Logical processors: 12
Processor groups: 1
Processor group size: 12
RAM: 24501 MB total

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CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed (WMI): 340 MHz
Reported CPU speed (registry): 340 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.

_________________________________________________________________________________________________________
MEASURED INTERRUPT TO USER PROCESS LATENCIES
_________________________________________________________________________________________________________
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): 743.90
Average measured interrupt to process latency (µs): 5.623797

Highest measured interrupt to DPC latency (µs): 737.50
Average measured interrupt to DPC latency (µs): 2.862066

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REPORTED ISRs
_________________________________________________________________________________________________________
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): 570.330
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Highest reported total ISR routine time (%): 0.067766
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Total time spent in ISRs (%) 0.080620

ISR count (execution time <250 µs): 616540
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-1000 µs): 41
ISR count (execution time 1000-2000 µs): 0
ISR count (execution time 2000-4000 µs): 0
ISR count (execution time >=4000 µs): 0

_________________________________________________________________________________________________________
REPORTED DPCs
_________________________________________________________________________________________________________
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): 1317.80
Driver with highest DPC routine execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 456.71 , NVIDIA Corporation

Highest reported total DPC routine time (%): 0.049101
Driver with highest DPC total execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 456.71 , NVIDIA Corporation

Total time spent in DPCs (%) 0.113859

DPC count (execution time <250 µs): 1319028
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-10000 µs): 459
DPC count (execution time 1000-2000 µs): 6
DPC count (execution time 2000-4000 µs): 0
DPC count (execution time >=4000 µs): 0

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REPORTED HARD PAGEFAULTS
_________________________________________________________________________________________________________
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: chrome.exe

Total number of hard pagefaults 454
Hard pagefault count of hardest hit process: 99
Number of processes hit: 21

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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 39.242810
CPU 0 ISR highest execution time (µs): 570.330
CPU 0 ISR total execution time (s): 10.559320
CPU 0 ISR count: 609128
CPU 0 DPC highest execution time (µs): 1317.80
CPU 0 DPC total execution time (s): 14.320331
CPU 0 DPC count: 1230368
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CPU 1 Interrupt cycle time (s): 3.506539
CPU 1 ISR highest execution time (µs): 11.060
CPU 1 ISR total execution time (s): 0.002065
CPU 1 ISR count: 1464
CPU 1 DPC highest execution time (µs): 155.140
CPU 1 DPC total execution time (s): 0.022348
CPU 1 DPC count: 3816
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CPU 2 Interrupt cycle time (s): 5.363208
CPU 2 ISR highest execution time (µs): 15.350
CPU 2 ISR total execution time (s): 0.001374
CPU 2 ISR count: 953
CPU 2 DPC highest execution time (µs): 419.960
CPU 2 DPC total execution time (s): 0.271340
CPU 2 DPC count: 41187
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CPU 3 Interrupt cycle time (s): 3.720229
CPU 3 ISR highest execution time (µs): 20.650
CPU 3 ISR total execution time (s): 0.004109
CPU 3 ISR count: 3211
CPU 3 DPC highest execution time (µs): 416.650
CPU 3 DPC total execution time (s): 0.161366
CPU 3 DPC count: 23531
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CPU 4 Interrupt cycle time (s): 3.617543
CPU 4 ISR highest execution time (µs): 9.120
CPU 4 ISR total execution time (s): 0.001147
CPU 4 ISR count: 697
CPU 4 DPC highest execution time (µs): 318.420
CPU 4 DPC total execution time (s): 0.134123
CPU 4 DPC count: 17798
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CPU 5 Interrupt cycle time (s): 2.983922
CPU 5 ISR highest execution time (µs): 6.80
CPU 5 ISR total execution time (s): 0.001755
CPU 5 ISR count: 1128
CPU 5 DPC highest execution time (µs): 86.740
CPU 5 DPC total execution time (s): 0.018101
CPU 5 DPC count: 2793
_________________________________________________________________________________________________________

t.l. · July 10, 2022

well i figured it out??? so i used sdio link(https://sourceforge.net/projects/snappy-driver-installer-origin/) to update the driver's. the driver that worked for me from what i've seen is the amd psp 11.0?? i have no clue? but it works now. i will test more later to verify this(with a fresh install) problem since i have been plagued with it for over 2 years and no one giving and solution to the problem. so i hope this helps one of you.