Nvidia DPC latency

[Eichel Piet]

Hey guys. 

 

I have a problem with DPC latency caused by nvlddmkm.sys (Nvidia drivers). I read a lot of threads about it but nothing i tried helped me fix it. 

 

Things i tried:

- complete fresh OS

- reinstalling every driver multiple times (older versions too)

- disabling CPU throttling

- no Nvidia HD Audio driver

 

Without the Nvidia driver there is near no/normal latency 

 

Spoiler

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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  0:07:50  (h:mm:ss) on all processors.

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SYSTEM INFORMATION
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Computer name:                                        DESKTOP-C94EK0Q
OS version:                                           Windows 10 , 10.0, build: 15063 (x64)
Hardware:                                             ASUSTeK COMPUTER INC., MAXIMUS VIII HERO
CPU:                                                  GenuineIntel Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Logical processors:                                   8
Processor groups:                                     1
RAM:                                                  16322 MB total

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CPU SPEED
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Reported CPU speed:                                   4008 MHz
Measured CPU speed:                                   1 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.

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):   998,195991
Average measured interrupt to process latency (µs):   1,607855

Highest measured interrupt to DPC latency (µs):       996,663057
Average measured interrupt to DPC latency (µs):       0,558119

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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):              204,912425
Driver with highest ISR routine execution time:       dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Highest reported total ISR routine time (%):          0,064772
Driver with highest ISR total time:                   dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Total time spent in ISRs (%)                          0,082512

ISR count (execution time <250 µs):                   376627
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):              5329,373004
Driver with highest DPC routine execution time:       nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 385.41 , NVIDIA Corporation

Highest reported total DPC routine time (%):          0,030497
Driver with highest DPC total execution time:         nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 385.41 , NVIDIA Corporation

Total time spent in DPCs (%)                          0,100834

DPC count (execution time <250 µs):                   2271663
DPC count (execution time 250-500 µs):                0
DPC count (execution time 500-999 µs):                34
DPC count (execution time 1000-1999 µs):              18
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.

Process with highest pagefault count:                 none

Total number of hard pagefaults                       0
Hard pagefault count of hardest hit process:          0
Highest hard pagefault resolution time (µs):          0,0
Total time spent in hard pagefaults (%):              0,0
Number of processes hit:                              0

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 PER CPU DATA
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CPU 0 Interrupt cycle time (s):                       9,034225
CPU 0 ISR highest execution time (µs):                204,912425
CPU 0 ISR total execution time (s):                   3,100812
CPU 0 ISR count:                                      375969
CPU 0 DPC highest execution time (µs):                5329,373004
CPU 0 DPC total execution time (s):                   3,344266
CPU 0 DPC count:                                      2082244
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CPU 1 Interrupt cycle time (s):                       1,117498
CPU 1 ISR highest execution time (µs):                44,179641
CPU 1 ISR total execution time (s):                   0,001748
CPU 1 ISR count:                                      658
CPU 1 DPC highest execution time (µs):                107,896707
CPU 1 DPC total execution time (s):                   0,036279
CPU 1 DPC count:                                      7366
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CPU 2 Interrupt cycle time (s):                       1,347120
CPU 2 ISR highest execution time (µs):                0,0
CPU 2 ISR total execution time (s):                   0,0
CPU 2 ISR count:                                      0
CPU 2 DPC highest execution time (µs):                106,886228
CPU 2 DPC total execution time (s):                   0,132702
CPU 2 DPC count:                                      99337
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CPU 3 Interrupt cycle time (s):                       1,158504
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):                58,004990
CPU 3 DPC total execution time (s):                   0,024343
CPU 3 DPC count:                                      7814
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CPU 4 Interrupt cycle time (s):                       1,256590
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):                69,698603
CPU 4 DPC total execution time (s):                   0,082874
CPU 4 DPC count:                                      27451
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CPU 5 Interrupt cycle time (s):                       1,195590
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):                117,625998
CPU 5 DPC total execution time (s):                   0,027855
CPU 5 DPC count:                                      7734
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CPU 6 Interrupt cycle time (s):                       1,277273
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):                44,000998
CPU 6 DPC total execution time (s):                   0,099060
CPU 6 DPC count:                                      28950
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CPU 7 Interrupt cycle time (s):                       1,149992
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):                55,986527
CPU 7 DPC total execution time (s):                   0,044122
CPU 7 DPC count:                                      10820
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Really hope some of you guys have more ideas.

 

Thx for the help already

 

Piet

 

 

[Majestic]

Contact Nvidia.

 

Also, how is this affecting your actual usage, other than some utility reporting an issue?

[Mira Yurizaki]

Let's see... Most of the DPC executions were done in under 250 uS. Only 0.00229% of these were up to 2ms.

 

If this is a trend throughout time, I don't think this is anything to lose sleep over.

[Eichel Piet]

You can hear pops and cracks in the sound, while gaming it gets a lot more and every activity with sound is like not doable anymore. 

 

And i forgot, i also tried the newest Bios drivers.

 

Setup: 

Win 10 Home
Intel I7 6700k

Asus Maximus Hero VIII
Asus Geforce GTX 980