[W10StdV1703b15063 x64] DPC storport or CPU throttling

J

Jak22099

Member
Joined
Jul 23, 2017
Posts
6
Location
Tennessee
Hi, new to this forum but joined up because I saw many people having the same issue as me. I am also experiencing severe audio/video latency that is seeming to also be caused by storport.sys. I have tried many things, including going through and disabling/reenabling all my drivers, (including sound drivers and network adapters), I replaced my soundcard, I uninstalled and reinstalled all of my NVIDIA drivers, I tried reverting to a previous version of Windows 10, (I re updated to the latest version after it didn't work as well), I used driver easy and driver verifier to check for corrupted and out of date drivers, I checked my power management settings, updated my BIOS, tried overclocking my CPU in my BIOS, and unplugged my monitors and all of my USB devices. None of that has put a dent in my problem, as I still get Latency µs counts of anywhere from 30,000 to 200,000. Similar to other descriptions, it causes audio pop outs and video lag every few seconds. I used latency monitor which said the problem was due to CPU throttling, but showed storport.sys as the only process creating latency. Occasionally I won't have latency at all, and then it will suddenly return. It works whether I am streaming or using downloaded content.

______________________________________________________________________________________________________________________________________________________________________________
SPECS AND LATENCYMON RESULTS
______________________________________________________________________________________________________________________________________________________________________________

My computer is a custom built desktop. Here are my specs from System Information. If it's missing anything let me know.

DISPLAY INFO: Imgur: The most awesome images on the Internet

GENERAL INFO: Imgur: The most awesome images on the Internet

LATENCYMON RESULTS: Imgur: The most awesome images on the Internet

______________________________________________________________________________________________________________________________________________________________________________
WINDOWS PERFORMANCE ANALYZER TRACE FILE:
______________________________________________________________________________________________________________________________________________________________________________
I downloaded SDK as well and attempted to capture a trace file as recommended to provide further info. However, when I copied and entered the first line of code provided, I got the message:

C:\WINDOWS\system32>xperf -stop -d C:\CPU.etl
'xperf' is not recognized as an internal or external command,
operable program or batch file.

If anyone can help me with this as well I can try and provide an accurate trace file.

I would appreciate it if you guys could also help me with this infuriating problem that many others seem to be dealing with. Thanks in advance, and like I said earlier if there's any info I left out that you need just let me know.

EDIT:
______________________________________________________________________________________________________________________________________________________________________________ IN-DEPTH LATENCY TEST RESULTS
______________________________________________________________________________________________________________________________________________________________________________

Here are my results as well from using the in depth latency test software.

OVERVIEW: Imgur: The most awesome images on the Internet


DETAILS: Imgur: The most awesome images on the Internet
 
Re: High DPC latency from NDIS.sys, storport.sys causing audio issues

FORGOT TO ADD: The rest of my information from LatencyMon
_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: JACK-PC
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: ASUSTeK COMPUTER INC., MAXIMUS IX HERO
CPU: GenuineIntel Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Logical processors: 8
Processor groups: 1
RAM: 16314 MB total




_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed: 4008.0 MHz
Measured CPU speed: 4442.0 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): 100604.794308
Average measured interrupt to process latency (µs): 13.272134


Highest measured interrupt to DPC latency (µs): 100603.005883
Average measured interrupt to DPC latency (µs): 12.168925




_________________________________________________________________________________________________________
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): 169.813373
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation


Highest reported total ISR routine time (%): 0.130820
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation


Total time spent in ISRs (%) 0.175379


ISR count (execution time <250 µs): 42955
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): 100605.728792
Driver with highest DPC routine execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation


Highest reported total DPC routine time (%): 1.044303
Driver with highest DPC total execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation


Total time spent in DPCs (%) 1.353271


DPC count (execution time <250 µs): 161913
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 1
DPC count (execution time 1000-1999 µs): 1
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): 1.848425
CPU 0 ISR highest execution time (µs): 169.813373
CPU 0 ISR total execution time (s): 0.213931
CPU 0 ISR count: 36125
CPU 0 DPC highest execution time (µs): 100605.728792
CPU 0 DPC total execution time (s): 1.779832
CPU 0 DPC count: 117705
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 0.216796
CPU 1 ISR highest execution time (µs): 103.313872
CPU 1 ISR total execution time (s): 0.039533
CPU 1 ISR count: 6666
CPU 1 DPC highest execution time (µs): 100340.835329
CPU 1 DPC total execution time (s): 0.146228
CPU 1 DPC count: 7937
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 0.077867
CPU 2 ISR highest execution time (µs): 40.669162
CPU 2 ISR total execution time (s): 0.000581
CPU 2 ISR count: 134
CPU 2 DPC highest execution time (µs): 46.0
CPU 2 DPC total execution time (s): 0.023640
CPU 2 DPC count: 32814
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 0.045343
CPU 3 ISR highest execution time (µs): 3.514471
CPU 3 ISR total execution time (s): 0.000029
CPU 3 ISR count: 30
CPU 3 DPC highest execution time (µs): 58.888473
CPU 3 DPC total execution time (s): 0.001887
CPU 3 DPC count: 555
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 0.050103
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): 34.458333
CPU 4 DPC total execution time (s): 0.002499
CPU 4 DPC count: 906
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 0.049370
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): 26.509481
CPU 5 DPC total execution time (s): 0.001932
CPU 5 DPC count: 614
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 0.053046
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): 26.072355
CPU 6 DPC total execution time (s): 0.003076
CPU 6 DPC count: 952
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 0.042133
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): 15.846307
CPU 7 DPC total execution time (s): 0.001416
CPU 7 DPC count: 448
_________________________________________________________________________________________________________


Here are Screenshots as well of the Processes, Drivers, and CPU's data

CPU: Imgur: The most awesome images on the Internet
Processes:Imgur: The most awesome images on the Internet
Drivers: Imgur: The most awesome images on the Internet


ALSO:
For some reason all of the latencymon-related software says I'm running Windows 8. I don't know why this is, I am running Windows 10 Home Edition. All of the other info seems to be accurate though.
 
Re: storport.sys or CPU throttling latency

Please use the Windows Performance Analyzer to provide us with your trace file. The trace file will probably be too large to upload here, so host it from a third party site like Dropbox or Microsoft OneDrive.

Windows 10 SDK - Windows app development

https://www.sysnative.com/forums/wi...c-latency-issues-wpa-windows-vista-7-8-a.html (similar steps can be used with the Windows 10 WPA)


Please also provide your dxdiag and msinfo32 reports:

Open and run DxDiag.exe

This tool is used to collect info about devices to help troubleshoot problems with DirectX sound and video. A support person might ask for this info, or you might post it in a forum when you ask for help.


  • In Windows, select Start and enter dxdiag into the search box on the taskbar. Select dxdiag from the results.
  • In the tool, select Save All Information for an easily shared format.


Run msinfo32

Open an instance of elevated command prompt:
  • Log on to your Windows 10 computer using any account of your preference.
  • Once on the desktop screen, right-click the Start button.
  • From the context menu, click Command Prompt (Admin) or Windows PowerShell (Admin)
  • If you opened Windows PowerShell, type
    Code: 
    cmd
    to start the Command Prompt

  • Type the following into the Command Prompt
    Code: 
    msinfo32 /nfo %USERPROFILE%\Desktop\msinfo32.nfo
  • Zip the msinfo.nfo file up (found on the Desktop of your administrator account) and attach it to your next post
Click to expand...
 
Re: storport.sys or CPU throttling latency

I have done as you requested and put the zipped trace kernel file, zipped msinfo32 file, and DxDiag result text file onto my OneDrive. If there's any other info you need, or the trace didn't catch my problem and needs to be ran again, please let me know. Thank you so much for your help so far!

ONEDRIVE LINK FOR ALL 3 FILES:
https://1drv.ms/f/s!Ar4BF44VeEvsmlzLxtZ7OEwe-7eN
 
Re: storport.sys or CPU throttling latency

I'm seeing some usage spikes from Google Chrome. Have you tried another browser?

I also see some spikes from Windows Defender that may suggest corruption in your Windows install. Run the following in an elevated command prompt (see my previous post for steps to open an elevated command prompt):
Code: 
sfc /scannow
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHealth


Check your motherboard retailer for your motherboard model, and install any updates to Intel Rapid Storage Technology. You should also check all SATA connectors to ensure they are properly connected to your SSD and HDDs, and make sure your RAM is seated properly in its slots.


If none of the above help, start performing some hardware testing to make sure hardware isn't overheating or failing:

 
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Re: storport.sys or CPU throttling latency

Alright. I tried uninstalling chrome and using edge and still had latency issues. I ran everything you said in an elevated command prompt, and the results said everything was normal.
I checked all of my SATA connections which also didn't solve the problem.

HOWEVER:
I tried re-seating the RAM and the problem was gone when I restarted. However, it returned again after I restarted a few more times.

It's confusing because I get different results from latencymon; sometimes it is iaStor or storport.sys causing the latency according to the results, but other times like in a screenshot I will attatch, I have latency but no driver shows up as causing a significant amount.

Screenshot: Imgur: The most awesome images on the Internet

It's hard to get a lock on it since sometimes my computer works fine, only for the problem to return later. I also downloaded the latest Intel Rapid Storage Technology software and updated my Nvidia drivers also to no avail. Intel Rapid Storage says all of my hard drives are normal and functioning correctly. I also downloaded the Realtek audio driver for my motherboard.
Since one of the problems appeared to be storport.sys, I tried unplugging my other 2 hard drives and just booting from my ssd and that didn't fix the problem either. If you have any other ideas, or need more info, I'm more than open to try them. Thanks again.

PS. Here's what the reading looks like when I'm not experiencing latency:

Low latency reading - Album on Imgur
 
Re: storport.sys or CPU throttling latency

Under audio devices in Device Manager, try disabling your NVIDIA High Definition Audio device if you're not using it.
 
Re: storport.sys or CPU throttling latency

writhziden said:
Under audio devices in Device Manager, try disabling your NVIDIA High Definition Audio device if you're not using it.
Click to expand...

I've been screwing with this for days now. Pulling my hair out trying to figure it out.

Finally fixed the problem doing two things. It is linked to a corrupt Intel Ethernet Driver, in my case Intel(R) 82583V, and the NVIDIA HD Audio, disable both in the Device Manager and run wifi instead.

The DPC latency problem went away completely...
 
Re: storport.sys or CPU throttling latency

richwalsh said:
writhziden said:
Under audio devices in Device Manager, try disabling your NVIDIA High Definition Audio device if you're not using it.
Click to expand...

I've been screwing with this for days now. Pulling my hair out trying to figure it out.

Finally fixed the problem doing two things. It is linked to a corrupt Intel Ethernet Driver, in my case Intel(R) 82583V, and the NVIDIA HD Audio, disable both in the Device Manager and run wifi instead.

The DPC latency problem went away completely...
Click to expand...

I need to append my previous statement, that didn't fully solve the problem. I had to go into the bios and disable the following settings. Set legacy USB support to Auto then disable HPET, UEFI, and Legacy USB 3.0 support. Those combination of bios settings got my latency down from OFF the freaking charts, to stable at 500-600. *stable for 4 hours now* fingers crossed, I'll update if I figure anything else out.
 
Re: storport.sys or CPU throttling latency

Sorry I was gone for so long had moving in to college to deal with. I took both of you guys' advice, I disabled the Nvidia Audio Driver and am running audio through my soundcard and I went into the bIOS and tried to do what you said. However the only setting you mentioned that I found was Legacy USB support which I turned to auto like you requested. I couldn't find an option for HPET, UEFI, or Legacy 3.0. Setting this to auto and disabling the nvidia driver still hasn't solved my problem tho :/ if there's any other ideas you guys have please let me know (btw my motherboard is an ROG IX Hero so thats the biOS Im using)
 
Re: storport.sys or CPU throttling latency

Will do. Whats also worth noting that is weird is that when running LatencyMon, sometimes the problem appears to be storport.sys while other times it just shows up as a normal interrupt instead of an ISR Routine Execution delay, so I'm still not sure if it is entirely a storport problem. I also tried disabling my onboard sound in the bios and just using my installed soundboard, but that didn't work. I also uninstalled and reinstalled all of my Realtek drivers as well as overclocking my CPU. I will get back to you when I finish replacing the SATA drivers tho.
 
Re: storport.sys or CPU throttling latency

Hi Jak22099. :welcome:

There's a new bios for your asus MAXIMUS IX HERO (and for your cpu i7-6700k).
Current bios seems to be version 0906, new bios is version 1009 2017/08/04.
Read carefully your manual before updating the bios.
Remember the precautions: system restore point, backup of your important files, system image, windows cd at hand...
 
Last edited:

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