Windows 10: DPC Latency Issues? APCI Driver for NT

Hello,


I'm working on trouble shooting an audio interface on my laptop.


.OS Name Microsoft Windows 10 Home

Version 10.0.18362 Build 18362

Other OS Description Not Available

OS Manufacturer Microsoft Corporation


System Manufacturer HP

System Model OMEN by HP Laptop 15-dc0xxx

System Type x64-based PC


Processor Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz, 2208 Mhz, 6 Core(s), 12 Logical Processor(s)

BIOS Version/Date AMI F.09, 6/11/2019

Installed Physical Memory (RAM) 32.0 GB






I've been having a lot of audio drop outs\disconnections. I've tried a lot of the usual troubleshooting (adjusted power save settings,,updating firmware/ drivers.) The manufacturer of the interface suggested I'm having DPC Latency issues. However they told me to contact microsoft tech support. i tried and they said there services were down temporarily


I ran a Latency monitor and generated this report (listed below). Anyone know where i go from here on this one


Thank you in advanced




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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. Also one or more ISR 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 0:21:27 (h:mm:ss) on all processors.





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SYSTEM INFORMATION

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Computer name: LAPTOP-3VG3IKO1

OS version: Windows 10 , 10.0, version 1903, build: 18362 (x64)

Hardware: OMEN by HP Laptop 15-dc0xxx, HP, 84DB

CPU: GenuineIntel Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz

Logical processors: 12

Processor groups: 1

RAM: 32643 MB total





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CPU SPEED

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Reported CPU speed: 2208 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): 4689.70

Average measured interrupt to process latency (µs): 7.332006



Highest measured interrupt to DPC latency (µs): 4668.90

Average measured interrupt to DPC latency (µs): 3.827375





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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): 2215.725543

Driver with highest ISR routine execution time: ACPI.sys - ACPI Driver for NT, Microsoft Corporation



Highest reported total ISR routine time (%): 0.105863

Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation



Total time spent in ISRs (%) 0.124861



ISR count (execution time <250 µs): 427198

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

ISR count (execution time 500-999 µs): 772

ISR count (execution time 1000-1999 µs): 16

ISR count (execution time 2000-3999 µs): 1

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): 4951.003623

Driver with highest DPC routine execution time: ACPI.sys - ACPI Driver for NT, Microsoft Corporation



Highest reported total DPC routine time (%): 0.064940

Driver with highest DPC total execution time: ACPI.sys - ACPI Driver for NT, Microsoft Corporation



Total time spent in DPCs (%) 0.160781



DPC count (execution time <250 µs): 3466688

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

DPC count (execution time 500-999 µs): 25629

DPC count (execution time 1000-1999 µs): 234

DPC count (execution time 2000-3999 µs): 7

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: aswidsagent.exe



Total number of hard pagefaults 9782

Hard pagefault count of hardest hit process: 5789

Number of processes hit: 55





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PER CPU DATA

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CPU 0 Interrupt cycle time (s): 103.305379

CPU 0 ISR highest execution time (µs): 2215.725543

CPU 0 ISR total execution time (s): 18.100338

CPU 0 ISR count: 322167

CPU 0 DPC highest execution time (µs): 4951.003623

CPU 0 DPC total execution time (s): 23.189532

CPU 0 DPC count: 3248133

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CPU 1 Interrupt cycle time (s): 93.387618

CPU 1 ISR highest execution time (µs): 945.293478

CPU 1 ISR total execution time (s): 0.910654

CPU 1 ISR count: 12817

CPU 1 DPC highest execution time (µs): 1798.274457

CPU 1 DPC total execution time (s): 0.746101

CPU 1 DPC count: 33922

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CPU 2 Interrupt cycle time (s): 56.543911

CPU 2 ISR highest execution time (µs): 882.185688

CPU 2 ISR total execution time (s): 0.222598

CPU 2 ISR count: 3476

CPU 2 DPC highest execution time (µs): 802.066123

CPU 2 DPC total execution time (s): 0.220013

CPU 2 DPC count: 19089

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CPU 3 Interrupt cycle time (s): 53.347863

CPU 3 ISR highest execution time (µs): 255.488225

CPU 3 ISR total execution time (s): 0.001554

CPU 3 ISR count: 69

CPU 3 DPC highest execution time (µs): 220.083333

CPU 3 DPC total execution time (s): 0.004701

CPU 3 DPC count: 857

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CPU 4 Interrupt cycle time (s): 37.814304

CPU 4 ISR highest execution time (µs): 36.418478

CPU 4 ISR total execution time (s): 0.000077

CPU 4 ISR count: 33

CPU 4 DPC highest execution time (µs): 172.794384

CPU 4 DPC total execution time (s): 0.013037

CPU 4 DPC count: 6978

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CPU 5 Interrupt cycle time (s): 38.171434

CPU 5 ISR highest execution time (µs): 0.0

CPU 5 ISR total execution time (s): 0.0

CPU 5 ISR count: 0

CPU 5 DPC highest execution time (µs): 228.501812

CPU 5 DPC total execution time (s): 0.002979

CPU 5 DPC count: 601

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CPU 6 Interrupt cycle time (s): 42.463482

CPU 6 ISR highest execution time (µs): 0.0

CPU 6 ISR total execution time (s): 0.0

CPU 6 ISR count: 0

CPU 6 DPC highest execution time (µs): 249.101449

CPU 6 DPC total execution time (s): 0.009177

CPU 6 DPC count: 1703

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CPU 7 Interrupt cycle time (s): 42.261761

CPU 7 ISR highest execution time (µs): 0.0

CPU 7 ISR total execution time (s): 0.0

CPU 7 ISR count: 0

CPU 7 DPC highest execution time (µs): 268.133152

CPU 7 DPC total execution time (s): 0.013936

CPU 7 DPC count: 3133

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CPU 8 Interrupt cycle time (s): 93.690153

CPU 8 ISR highest execution time (µs): 64.101449

CPU 8 ISR total execution time (s): 0.005193

CPU 8 ISR count: 5317

CPU 8 DPC highest execution time (µs): 309.924819

CPU 8 DPC total execution time (s): 0.010380

CPU 8 DPC count: 1663

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CPU 9 Interrupt cycle time (s): 28.884591

CPU 9 ISR highest execution time (µs): 58.512681

CPU 9 ISR total execution time (s): 0.054909

CPU 9 ISR count: 81914

CPU 9 DPC highest execution time (µs): 305.535326

CPU 9 DPC total execution time (s): 0.578048

CPU 9 DPC count: 167043

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CPU 10 Interrupt cycle time (s): 83.118980

CPU 10 ISR highest execution time (µs): 60.822464

CPU 10 ISR total execution time (s): 0.001245

CPU 10 ISR count: 1276

CPU 10 DPC highest execution time (µs): 285.726449

CPU 10 DPC total execution time (s): 0.054756

CPU 10 DPC count: 8545

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CPU 11 Interrupt cycle time (s): 77.979066

CPU 11 ISR highest execution time (µs): 52.637681

CPU 11 ISR total execution time (s): 0.000767

CPU 11 ISR count: 918

CPU 11 DPC highest execution time (µs): 228.122283

CPU 11 DPC total execution time (s): 0.006072

CPU 11 DPC count: 893

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:)

 

DPC Latency High

Hi,

Check these:

Solving DPC Latency Issues - Download Latency Monitor and DPC Latency Checker

https://www.sweetwater.com/sweetcare/articles/solving-dpc-latency-issues/

DPC Latency Checker

Troubleshoot Driver Problems Using DPC Latency Checker - Windows Tutorials

DPC Latency Checker - Download

DPC Latency Checker

Hope this helps.

--------------------------------------------------------------------------------------------

Rob Brown -
Microsoft MVP <- profile - Windows and Devices for IT : Bicycle - Mark Twain said it right.

 

High DPC latency

I use my Dell XPS for recording and live playback but the system suffers from high DPC latency caused by ACPI driver.

I removed Dell audio drivers and installed those from RealTek with no avail. Latency is an issue because I need this computer for live recording. Please your advice.

 

Sound Latency Issues

I have recently run into sound latency issues and think recent updates have caused this as I've successfully used Ableton for 2+ years with no sound crackling, dropouts or popping. I just restored Windows and its still happening. Ran latencymon and get the
feedback that issue is storport.sys. Any ideas how to fix? Latencymon info:

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SYSTEM INFORMATION

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Computer name: LENOVO-PC

OS version: Windows 10 , 10.0, build: 17134 (x64)

Hardware: 20238, LENOVO, INVALID

CPU: GenuineIntel Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz

Logical processors: 8

Processor groups: 1

RAM: 8104 MB total

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CPU SPEED

_________________________________________________________________________________________________________

Reported CPU speed: 2394 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): 105149.492355

Average measured interrupt to process latency (µs): 30.901791
Highest measured interrupt to DPC latency (µs): 105124.688509

Average measured interrupt to DPC latency (µs): 28.102392

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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): 105324.005013

Driver with highest DPC routine execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation
Highest reported total DPC routine time (%): 1.095332

Driver with highest DPC total execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation
Total time spent in DPCs (%) 1.129141
DPC count (execution time <250 µs): 60801

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

DPC count (execution time 500-999 µs): 0

DPC count (execution time 1000-1999 µs): 0

DPC count (execution time 2000-3999 µs): 0

DPC count (execution time >=4000 µs): 0