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ACPI.sys and Wdf01000.sys causing high DPC latency. Sound freezing.
Old 14th February 2017
  #1
Here for the gear
 

ACPI.sys and Wdf01000.sys causing high DPC latency. Sound freezing.

I have bought a new Dell XPS15 (9560) which I mainly want to use for DJing with Traktor DJ software. However, during DJing I hear glitches and pops and after a few minutes the sound freezes. You hear a buzz, which is a repetition of sound of like 2 ms I think. The software is still responding though, it's just the sound that's freezing.

I optimized Windows 10 for performance using this guideline: https://www.sweetwater.com/sweetcare...or-windows-10/
After that didn't work I decided to do a clean install of Windows 10. I downloaded all the latest drivers from the Dell website and tried DJing again. Unfortunately I still have the same problem.

While DJing I connect it to my Traktor Audio 6 external sound card through USB and I also use a Traktor X1 midi controller connected via USB. I think it has something to do with my sound card, cause when I play through my internal sound card I don't hear any glitches.

This is my hardware:
Dell XPS 15 9560
Intel Core i7 7700hq
Nividia Geforce GTX 1050
16GB DDR4 2400mhz
512GB SSD
Windows 10 Home 64 bit
Complete list of specs can be found here: XPS 15 9560 High Performance Laptop with InfinityEdge Display | Dell


I ran LatencyMon while DJing and I got the following result:
As you can see, way to high latency and hard pagefaults. Who can help me identify and solve the problem?

_________________________________________________________________________________________________________
CONCLUSION
_________________________________________________________________________________________________________
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 0:06:56 (h:mm:ss) on all processors.

_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: DESKTOP-HFBUDJ4
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: XPS 15 9560, Dell Inc., 05FFDN
CPU: GenuineIntel Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
Logical processors: 8
Processor groups: 1
RAM: 16201 MB total

_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed: 2808,0 MHz
Measured CPU speed: 3042,0 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.

_________________________________________________________________________________________________________
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): 21689,978951
Average measured interrupt to process latency (µs): 6,458951
Highest measured interrupt to DPC latency (µs): 3691,577674
Average measured interrupt to DPC latency (µs): 2,008820

_________________________________________________________________________________________________________
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): 157,980769
Driver with highest ISR routine execution time: ACPI.sys - ACPI-stuurprogramma voor NT, Microsoft Corporation
Highest reported total ISR routine time (%): 0,009454
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework-runtime, Microsoft Corporation
Total time spent in ISRs (%) 0,014629
ISR count (execution time <250 µs): 294201
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

_________________________________________________________________________________________________________
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): 21409,710470
Driver with highest DPC routine execution time: ACPI.sys - ACPI-stuurprogramma voor NT, Microsoft Corporation
Highest reported total DPC routine time (%): 0,283908
Driver with highest DPC total execution time: Wdf01000.sys - Kernel Mode Driver Framework-runtime, Microsoft Corporation
Total time spent in DPCs (%) 0,395547
DPC count (execution time <250 µs): 1680101
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 1384
DPC count (execution time 1000-1999 µs): 10
DPC count (execution time 2000-3999 µs): 0
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 5157
Hard pagefault count of hardest hit process: 4602
Highest hard pagefault resolution time (µs): 361547,980413
Total time spent in hard pagefaults (%): 0,750315
Number of processes hit: 13

_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 31,340157
CPU 0 ISR highest execution time (µs): 136,851140
CPU 0 ISR total execution time (s): 0,471941
CPU 0 ISR count: 284729
CPU 0 DPC highest execution time (µs): 21409,710470
CPU 0 DPC total execution time (s): 11,308105
CPU 0 DPC count: 1427119
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 21,593659
CPU 1 ISR highest execution time (µs): 157,980769
CPU 1 ISR total execution time (s): 0,013466
CPU 1 ISR count: 9210
CPU 1 DPC highest execution time (µs): 1546,999288
CPU 1 DPC total execution time (s): 0,522029
CPU 1 DPC count: 42285
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 10,226479
CPU 2 ISR highest execution time (µs): 55,973647
CPU 2 ISR total execution time (s): 0,001374
CPU 2 ISR count: 248
CPU 2 DPC highest execution time (µs): 827,334046
CPU 2 DPC total execution time (s): 0,362544
CPU 2 DPC count: 60448
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 20,477954
CPU 3 ISR highest execution time (µs): 8,170940
CPU 3 ISR total execution time (s): 0,000081
CPU 3 ISR count: 14
CPU 3 DPC highest execution time (µs): 1623,392806
CPU 3 DPC total execution time (s): 0,060651
CPU 3 DPC count: 12738
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 10,692918
CPU 4 ISR highest execution time (µs): 0,0
CPU 4 ISR total execution time (s): 0,0
CPU 4 ISR count: 0
CPU 4 DPC highest execution time (µs): 789,753561
CPU 4 DPC total execution time (s): 0,286258
CPU 4 DPC count: 43449
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 19,744791
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): 605,868590
CPU 5 DPC total execution time (s): 0,081318
CPU 5 DPC count: 13295
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 18,214567
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): 864,829060
CPU 6 DPC total execution time (s): 0,225998
CPU 6 DPC count: 35772
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 19,318223
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): 736,665954
CPU 7 DPC total execution time (s): 0,317395
CPU 7 DPC count: 46392
_________________________________________________________________________________________________________
Old 15th February 2017
  #2
Gear Nut
 

Interesting that latencymon shows your system as windows 8.

I've recently been dealing with similar issues with a win 7 system.

driver and OS optimization did wonders though it is still a work in progress.

based on the drivers latencymon listed I would make sure I had the latest IRST driver installed. also try running latencymon with all internet and bluetooth adapters disabled, antivirus disabled, and windows update disabled if you weren't already.
Old 15th February 2017
  #3
Gear Maniac
In my Win 10 system I found the ACPI problem was related to the "turn off display/ put computer to sleep" settings in power options. I set both to "never", and the ACPI problem went away.
Old 15th February 2017
  #4
Here for the gear
 

I think/hope I found the solution. A user at another forum had the same problem with the same laptop. He advised to use Snappy Driver Installer: https://sdi-tool.org/
This tool*detects which are the most optimal drivers for your computer. I reinstalled the drivers with this tool instead of downloading them from the Dell website.

I started DJing again with LatencyMon running in the background. I heard some pops. I checked it in LatencyMon and I saw that*drivers related to the wireless networking card (tcpip.sys, ndis.sys) had a latency of between 1 and 2 ms. It is generally advised to disable your network card while DJing, so I disabled it in the device manager. After that I didn't hear any glitches and pops anymore!

There was 1 spike of ACPI.sys of 4ms which is too high, but it only happened one time. Wdf01000.sys which combined with ACPI.sys caused the most trouble when I still used the old drivers had a low latency of 0.4. Before it peaked at 21ms!
I'll keep running LatencyMon while DJing this week and hope my laptop will be stable.

Strange that the drivers from the Dell website are not the most optimal for my system.
Old 15th February 2017
  #5
Here for the gear
 

Quote:
Originally Posted by Patrick5150 View Post
Interesting that latencymon shows your system as windows 8.

I've recently been dealing with similar issues with a win 7 system.

driver and OS optimization did wonders though it is still a work in progress.

based on the drivers latencymon listed I would make sure I had the latest IRST driver installed. also try running latencymon with all internet and bluetooth adapters disabled, antivirus disabled, and windows update disabled if you weren't already.
Indeed very strange that it says I run Windows 8. It's a brand new laptop and Windows 8 has never been installed.
In my previous post I explain how I (think I) solved the issue. I don't know what caused it, because I installed a bunch of new drivers with Snappy Driver Installer. I hope it will be okay from now on.

Quote:
Originally Posted by pottering View Post
In my Win 10 system I found the ACPI problem was related to the "turn off display/ put computer to sleep" settings in power options. I set both to "never", and the ACPI problem went away.
I had already changed this setting. It didn't work for me unfortunately.

I'll keep you updated if there is any more trouble. Thanks for the help so far!
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