Almost satisfied (DPC Latency)

[Redpalmtree]

Hi, thanks for reading. I'm building a friend a DAW-machine and I am almost completely satisfied with the DPC Latency that I managed to achieve (average of 0,49μs).

 

Once in a while it still spikes, to around 50μs. I can't seem to find the driver that's causing this issue. It'd be freaking awesome if I could get this last bottleneck out of the way. I want to build him an ultimate audio producing rig so a stable 0,49μs would be AWESOME. 

 

Also, I don't really know what to do with the 'Hard Pagefault' number, any help would be appreciated.

 

Here's the Summary, and pictures of Latencymon and Device manager:

 

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CONCLUSION

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Your system appears to be suitable for handling real-time audio and other tasks without dropouts. 

LatencyMon has been analyzing your system for  1:49:20  (h:mm:ss) on all processors.

 

 

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SYSTEM INFORMATION

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Computer name:                                        CRPC1501

OS version:                                           Windows 8 , 6.2, build: 9200 (x64)

Hardware:                                             All Series, ASUS, ASUSTeK COMPUTER INC., Z97-A

CPU:                                                  GenuineIntel Intel® Core i7-4790 CPU @ 3.60GHz

Logical processors:                                   8

Processor groups:                                     1

RAM:                                                  16067 MB total

 

 

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CPU SPEED

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Reported CPU speed:                                   3592,0 MHz

Measured CPU speed:                                   3764,0 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.

 

 

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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):   46,756843

Average measured interrupt to process latency (µs):   2,024981

 

Highest measured interrupt to DPC latency (µs):       45,616432

Average measured interrupt to DPC latency (µs):       0,492042

 

 

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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):              10,503341

Driver with highest ISR routine execution time:       storport.sys - Microsoft Storage Port Driver, Microsoft Corporation

 

Highest reported total ISR routine time (%):          0,000124

Driver with highest ISR total time:                   storport.sys - Microsoft Storage Port Driver, Microsoft Corporation

 

Total time spent in ISRs (%)                          0,000134

 

ISR count (execution time <250 µs):                   37226

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):              66,777283

Driver with highest DPC routine execution time:       Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

 

Highest reported total DPC routine time (%):          0,001610

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 (%)                          0,002427

 

DPC count (execution time <250 µs):                   2262328

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

 

 

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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:                 svchost.exe

 

Total number of hard pagefaults                       114

Hard pagefault count of hardest hit process:          63

Highest hard pagefault resolution time (µs):          2041,586581

Total time spent in hard pagefaults (%):              0,000057

Number of processes hit:                              7

 

 

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 PER CPU DATA

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CPU 0 Interrupt cycle time (s):                       4,025723

CPU 0 ISR highest execution time (µs):                10,503341

CPU 0 ISR total execution time (s):                   0,070522

CPU 0 ISR count:                                      37226

CPU 0 DPC highest execution time (µs):                66,777283

CPU 0 DPC total execution time (s):                   1,244545

CPU 0 DPC count:                                      2243868

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CPU 1 Interrupt cycle time (s):                       1,215290

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):                6,322940

CPU 1 DPC total execution time (s):                   0,000869

CPU 1 DPC count:                                      609

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CPU 2 Interrupt cycle time (s):                       0,936802

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):                8,374165

CPU 2 DPC total execution time (s):                   0,003246

CPU 2 DPC count:                                      2188

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CPU 3 Interrupt cycle time (s):                       1,212683

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):                8,014477

CPU 3 DPC total execution time (s):                   0,001795

CPU 3 DPC count:                                      853

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CPU 4 Interrupt cycle time (s):                       0,948691

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):                8,212695

CPU 4 DPC total execution time (s):                   0,001661

CPU 4 DPC count:                                      1162

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CPU 5 Interrupt cycle time (s):                       1,214644

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):                5,649220

CPU 5 DPC total execution time (s):                   0,000683

CPU 5 DPC count:                                      435

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CPU 6 Interrupt cycle time (s):                       0,896538

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):                12,020045

CPU 6 DPC total execution time (s):                   0,001358

CPU 6 DPC count:                                      1073

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CPU 7 Interrupt cycle time (s):                       1,143016

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):                10,958797

CPU 7 DPC total execution time (s):                   0,019581

CPU 7 DPC count:                                      12140

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