Hi,
i'm trying to chase out an annoying DPC spike that Latencymon detects.
the offending driver is ntoskrnl.exe
it jumps up to 0.290ms
otherwise the system doesn't go above 0.130ms with NIC enabled.
I know this is not high by usual standards but i use this for real-time audio production and the lower the DPC latency the better.
can someone help re what is causing ntoskrnl to spike up like this?
I tried to do a trace via elevated command prompt but it didn't seem to do anything.
instructions said PC would get sluggish but nothing happened.
is there a better guide somewhere on how to run a trace?
I also tried to set up drop box but couldn't get it to work (files can't be previewed error)
driver/BIOS are updated to latest.
any help would be appreciated.
Latencymon stats below:
_________________________________________________________________________________________________________
CONCLUSION
_________________________________________________________________________________________________________
Your system appears to be suitable for handling real-time audio and other tasks without dropouts.
LatencyMon has been analyzing your system for 0:10:18 (h:mm:ss) on all processors.
_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name:
OS version: Windows 10 , 10.0, build: 16299 (x64)
Hardware: All Series, ASUS, ASUSTeK COMPUTER INC., X99-A
CPU: GenuineIntel Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
Logical processors: 12
Processor groups: 1
RAM: 32680 MB total
GPU - AMD RADEON RX550
_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed: 330 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.
_________________________________________________________________________________________________________
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): 70.438859
Average measured interrupt to process latency (µs): 2.417653
Highest measured interrupt to DPC latency (µs): 68.577039
Average measured interrupt to DPC latency (µs): 0.692375
_________________________________________________________________________________________________________
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): 3.695758
Driver with highest ISR routine execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation
Highest reported total ISR routine time (%): 0.000024
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation
Total time spent in ISRs (%) 0.000024
ISR count (execution time <250 µs): 2058
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): 290.372121
Driver with highest DPC routine execution time: ntoskrnl.exe - NT Kernel & System, Microsoft Corporation
Highest reported total DPC routine time (%): 0.001591
Driver with highest DPC total execution time: rspLLL64.sys - Resplendence Latency Monitoring and Auxiliary Kernel Library, Resplendence Software Projects Sp.
Total time spent in DPCs (%) 0.007828
DPC count (execution time <250 µs): 353533
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 11
DPC count (execution time 1000-1999 µs): 0
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.
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
_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 0.948339
CPU 0 ISR highest execution time (µs): 3.695758
CPU 0 ISR total execution time (s): 0.001769
CPU 0 ISR count: 2058
CPU 0 DPC highest execution time (µs): 81.947879
CPU 0 DPC total execution time (s): 0.292809
CPU 0 DPC count: 253948
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 0.255121
CPU 1 ISR highest execution time (µs): 0.0
CPU 1 ISR total execution time (s): 0.0
CPU 1 ISR count: 0
CPU 1 DPC highest execution time (µs): 290.372121
CPU 1 DPC total execution time (s): 0.011836
CPU 1 DPC count: 4834
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 0.295979
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): 290.174545
CPU 2 DPC total execution time (s): 0.025519
CPU 2 DPC count: 12467
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 0.247513
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): 290.047273
CPU 3 DPC total execution time (s): 0.011034
CPU 3 DPC count: 2975
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 0.274456
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): 289.495758
CPU 4 DPC total execution time (s): 0.027663
CPU 4 DPC count: 13198
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 0.241186
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): 289.667879
CPU 5 DPC total execution time (s): 0.010722
CPU 5 DPC count: 2720
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 0.505852
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): 289.395152
CPU 6 DPC total execution time (s): 0.086814
CPU 6 DPC count: 23025
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 0.255857
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): 289.201212
CPU 7 DPC total execution time (s): 0.009124
CPU 7 DPC count: 2362
_________________________________________________________________________________________________________
CPU 8 Interrupt cycle time (s): 0.267623
CPU 8 ISR highest execution time (µs): 0.0
CPU 8 ISR total execution time (s): 0.0
CPU 8 ISR count: 0
CPU 8 DPC highest execution time (µs): 288.825455
CPU 8 DPC total execution time (s): 0.027627
CPU 8 DPC count: 12294
_________________________________________________________________________________________________________
CPU 9 Interrupt cycle time (s): 0.257007
CPU 9 ISR highest execution time (µs): 0.0
CPU 9 ISR total execution time (s): 0.0
CPU 9 ISR count: 0
CPU 9 DPC highest execution time (µs): 288.835152
CPU 9 DPC total execution time (s): 0.012043
CPU 9 DPC count: 4664
_________________________________________________________________________________________________________
CPU 10 Interrupt cycle time (s): 0.330105
CPU 10 ISR highest execution time (µs): 0.0
CPU 10 ISR total execution time (s): 0.0
CPU 10 ISR count: 0
CPU 10 DPC highest execution time (µs): 288.493333
CPU 10 DPC total execution time (s): 0.043594
CPU 10 DPC count: 14699
_________________________________________________________________________________________________________
CPU 11 Interrupt cycle time (s): 0.267291
CPU 11 ISR highest execution time (µs): 0.0
CPU 11 ISR total execution time (s): 0.0
CPU 11 ISR count: 0
CPU 11 DPC highest execution time (µs): 288.528485
CPU 11 DPC total execution time (s): 0.02180
CPU 11 DPC count: 6358
_________________________________________________________________________________________________________
i'm trying to chase out an annoying DPC spike that Latencymon detects.
the offending driver is ntoskrnl.exe
it jumps up to 0.290ms
otherwise the system doesn't go above 0.130ms with NIC enabled.
I know this is not high by usual standards but i use this for real-time audio production and the lower the DPC latency the better.
can someone help re what is causing ntoskrnl to spike up like this?
I tried to do a trace via elevated command prompt but it didn't seem to do anything.
instructions said PC would get sluggish but nothing happened.
is there a better guide somewhere on how to run a trace?
I also tried to set up drop box but couldn't get it to work (files can't be previewed error)
driver/BIOS are updated to latest.
any help would be appreciated.
Latencymon stats below:
_________________________________________________________________________________________________________
CONCLUSION
_________________________________________________________________________________________________________
Your system appears to be suitable for handling real-time audio and other tasks without dropouts.
LatencyMon has been analyzing your system for 0:10:18 (h:mm:ss) on all processors.
_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name:
OS version: Windows 10 , 10.0, build: 16299 (x64)
Hardware: All Series, ASUS, ASUSTeK COMPUTER INC., X99-A
CPU: GenuineIntel Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
Logical processors: 12
Processor groups: 1
RAM: 32680 MB total
GPU - AMD RADEON RX550
_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed: 330 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.
_________________________________________________________________________________________________________
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): 70.438859
Average measured interrupt to process latency (µs): 2.417653
Highest measured interrupt to DPC latency (µs): 68.577039
Average measured interrupt to DPC latency (µs): 0.692375
_________________________________________________________________________________________________________
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): 3.695758
Driver with highest ISR routine execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation
Highest reported total ISR routine time (%): 0.000024
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation
Total time spent in ISRs (%) 0.000024
ISR count (execution time <250 µs): 2058
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): 290.372121
Driver with highest DPC routine execution time: ntoskrnl.exe - NT Kernel & System, Microsoft Corporation
Highest reported total DPC routine time (%): 0.001591
Driver with highest DPC total execution time: rspLLL64.sys - Resplendence Latency Monitoring and Auxiliary Kernel Library, Resplendence Software Projects Sp.
Total time spent in DPCs (%) 0.007828
DPC count (execution time <250 µs): 353533
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 11
DPC count (execution time 1000-1999 µs): 0
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.
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
_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 0.948339
CPU 0 ISR highest execution time (µs): 3.695758
CPU 0 ISR total execution time (s): 0.001769
CPU 0 ISR count: 2058
CPU 0 DPC highest execution time (µs): 81.947879
CPU 0 DPC total execution time (s): 0.292809
CPU 0 DPC count: 253948
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 0.255121
CPU 1 ISR highest execution time (µs): 0.0
CPU 1 ISR total execution time (s): 0.0
CPU 1 ISR count: 0
CPU 1 DPC highest execution time (µs): 290.372121
CPU 1 DPC total execution time (s): 0.011836
CPU 1 DPC count: 4834
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 0.295979
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): 290.174545
CPU 2 DPC total execution time (s): 0.025519
CPU 2 DPC count: 12467
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 0.247513
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): 290.047273
CPU 3 DPC total execution time (s): 0.011034
CPU 3 DPC count: 2975
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 0.274456
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): 289.495758
CPU 4 DPC total execution time (s): 0.027663
CPU 4 DPC count: 13198
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 0.241186
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): 289.667879
CPU 5 DPC total execution time (s): 0.010722
CPU 5 DPC count: 2720
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 0.505852
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): 289.395152
CPU 6 DPC total execution time (s): 0.086814
CPU 6 DPC count: 23025
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 0.255857
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): 289.201212
CPU 7 DPC total execution time (s): 0.009124
CPU 7 DPC count: 2362
_________________________________________________________________________________________________________
CPU 8 Interrupt cycle time (s): 0.267623
CPU 8 ISR highest execution time (µs): 0.0
CPU 8 ISR total execution time (s): 0.0
CPU 8 ISR count: 0
CPU 8 DPC highest execution time (µs): 288.825455
CPU 8 DPC total execution time (s): 0.027627
CPU 8 DPC count: 12294
_________________________________________________________________________________________________________
CPU 9 Interrupt cycle time (s): 0.257007
CPU 9 ISR highest execution time (µs): 0.0
CPU 9 ISR total execution time (s): 0.0
CPU 9 ISR count: 0
CPU 9 DPC highest execution time (µs): 288.835152
CPU 9 DPC total execution time (s): 0.012043
CPU 9 DPC count: 4664
_________________________________________________________________________________________________________
CPU 10 Interrupt cycle time (s): 0.330105
CPU 10 ISR highest execution time (µs): 0.0
CPU 10 ISR total execution time (s): 0.0
CPU 10 ISR count: 0
CPU 10 DPC highest execution time (µs): 288.493333
CPU 10 DPC total execution time (s): 0.043594
CPU 10 DPC count: 14699
_________________________________________________________________________________________________________
CPU 11 Interrupt cycle time (s): 0.267291
CPU 11 ISR highest execution time (µs): 0.0
CPU 11 ISR total execution time (s): 0.0
CPU 11 ISR count: 0
CPU 11 DPC highest execution time (µs): 288.528485
CPU 11 DPC total execution time (s): 0.02180
CPU 11 DPC count: 6358
_________________________________________________________________________________________________________
