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[SOLVED] [Win7SP1 x64] DPC, I've tried everything so far.

M

Masaru

Member
Joined
Sep 27, 2017
Posts
17
Since May, I've noticed that my computer was having audio clicks and pops, especially with graphically demanding operation, such as watching videos on YT and playing games. This has been driving me crazy, as I cannot use my PC properly anymore.
I've tried everything so far: I've tried to disable drivers, to update my bios, to disable cpu throttling in Control Panel, to update my motherboard's drivers, and recently I've even reset my whole system (which ran Windows 10 at the time), and everything on my hard drives has been whiped out (even though my usb wifi adapter was still running so I think it did not uninstall all the drivers). Right now I've downgraded my system to Windows 7, but it didn't help. I've ran LatencyMon after playing PUBG for 50 seconds, but I had to quit. Please help me, I'm about to give up on this computer. Here's the results:

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. Also one or more ISR 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 0:08:16 (h:mm:ss) on all processors.




_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: MASARELLINI
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
Hardware: ASUSTeK COMPUTER INC., RAMPAGE IV FORMULA
CPU: GenuineIntel Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz
Logical processors: 8
Processor groups: 1
RAM: 16323 MB total




_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed: 3602 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): 36893,886156
Average measured interrupt to process latency (µs): 2,891571


Highest measured interrupt to DPC latency (µs): 130,200338
Average measured interrupt to DPC latency (µs): 0,744494




_________________________________________________________________________________________________________
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): 37587,565519
Driver with highest ISR routine execution time: storport.sys - Microsoft Storage Port Driver, Microsoft Corporation


Highest reported total ISR routine time (%): 0,222278
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation


Total time spent in ISRs (%) 0,356477


ISR count (execution time <250 µs): 1048835
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 2
ISR count (execution time 1000-1999 µs): 2
ISR count (execution time 2000-3999 µs): 1
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): 37320,991949
Driver with highest DPC routine execution time: USBPORT.SYS - Driver porta USB 1.1 & 2.0, Microsoft Corporation


Highest reported total DPC routine time (%): 0,093109
Driver with highest DPC total execution time: USBPORT.SYS - Driver porta USB 1.1 & 2.0, Microsoft Corporation


Total time spent in DPCs (%) 0,329619


DPC count (execution time <250 µs): 4247025
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 278
DPC count (execution time 1000-1999 µs): 3
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 11027
Hard pagefault count of hardest hit process: 2723
Highest hard pagefault resolution time (µs): 501755,462798
Total time spent in hard pagefaults (%): 0,780657
Number of processes hit: 34




_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 6,648770
CPU 0 ISR highest execution time (µs): 18,611327
CPU 0 ISR total execution time (s): 0,371662
CPU 0 ISR count: 487493
CPU 0 DPC highest execution time (µs): 36272,820933
CPU 0 DPC total execution time (s): 1,853360
CPU 0 DPC count: 2553894
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 5,013019
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): 96,775403
CPU 1 DPC total execution time (s): 0,047409
CPU 1 DPC count: 6848
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 7,916518
CPU 2 ISR highest execution time (µs): 37130,498612
CPU 2 ISR total execution time (s): 2,890027
CPU 2 ISR count: 100388
CPU 2 DPC highest execution time (µs): 32450,108828
CPU 2 DPC total execution time (s): 1,355897
CPU 2 DPC count: 223023
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 18,328112
CPU 3 ISR highest execution time (µs): 37111,685730
CPU 3 ISR total execution time (s): 7,263395
CPU 3 ISR count: 238539
CPU 3 DPC highest execution time (µs): 37320,991949
CPU 3 DPC total execution time (s): 8,136909
CPU 3 DPC count: 811812
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 5,613938
CPU 4 ISR highest execution time (µs): 32098,494170
CPU 4 ISR total execution time (s): 0,319480
CPU 4 ISR count: 55177
CPU 4 DPC highest execution time (µs): 36832,689895
CPU 4 DPC total execution time (s): 0,484139
CPU 4 DPC count: 350879
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 9,039493
CPU 5 ISR highest execution time (µs): 37587,565519
CPU 5 ISR total execution time (s): 3,304153
CPU 5 ISR count: 167290
CPU 5 DPC highest execution time (µs): 36116,253748
CPU 5 DPC total execution time (s): 0,972321
CPU 5 DPC count: 246958
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 4,880792
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): 87,760411
CPU 6 DPC total execution time (s): 0,184327
CPU 6 DPC count: 50029
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 4,385198
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): 30677,078845
CPU 7 DPC total execution time (s): 0,048346
CPU 7 DPC count: 3922
_________________________________________________________________________________________________________
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Re: DPC Latency problem. I've tried everything so far...

Hello, I've tried to follow that guide. First of all after downloading the software from the provided link I only get the "Download the WSDK" option (I'll screenshot this passage). After selecting "Windows performance toolkit", the installer tells me to open another executable file that was downloaded in the path that I've previously chosen, to install Windows performance toolkit. If I open it, I get the error. I've also uploaded a screenshot of it. Maybe this program is for Windows 10 only, or at least it says so in the guide
 

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Re: DPC Latency problem. I've tried everything so far...

Up. Please help me. I'm willing to donate something if I manage to solve this problem, since the only alternative is to throw this PC in the trash
 
Re: DPC Latency problem. I've tried everything so far...

Hello, thanks for the reply. I'm currently using a USB Wireless Adapter, a Razer Blackwidow Stealth USB Keyboard (and a usb mouse connected to an USB port that the keyboard has), a docking station for my phone, a USB headset (Logitech G633). I've followed the guide and I've managed to create a trace file... I remember doing this process on Windows 10 when I first started to have this problem, and I rember that after opening the trace all the faulty processes would show up. I can't seem to find them right now, and I don't know why. Anyway, I've ran Latencymon at the same time, and I will also provide you with a screenshot of all the drivers that caused high latency. I'll try to provide you with another trace later, since this time I've only had high latency for a few seconds.

Link to the trace: Dropbox - trace.etl

Again, thank you for helping me
 

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Re: DPC Latency problem. I've tried everything so far...

Now that I'm thinking about it I've started to get this problem around the time that I got my headset. But I've already tried to unplug it while the latency is making my computer lag, and nothing happened... anyway, I'll try to record a more accurate trace
 
Re: DPC Latency problem. I've tried everything so far...

Yes. The GPUs (I have GTX 680 sli) drivers are updated. I've also tried tried to uninstall them completely and to download them through GeForce Experience, but nothing changed. I don't know about the chipset, I've tried to look for drivers in the site of the manufacturer, but they don't seem to be there.

Downloads for Intel(R) Core™ i7-3820 Processor (10M Cache, up to 3.80 GHz)

Anyway, they should have been updated automatically through Windows Update.
 
Re: DPC Latency problem. I've tried everything so far...

Over 80 drivers not found or not updated. I'm letting the program install them all (also, thanks for your suggestion, it looks like a really good program). Also, I've unplugged my keyboard while the latency was kicking in, and it immediately stopped: maybe it's just a coincidence, I've had this keyboard since 2015. I'll let you know once the drivers have all been installed.
 
Re: DPC Latency problem. I've tried everything so far...

Yes I did, the option is checked automatically.
 
Re: DPC Latency problem. I've tried everything so far...

softwaremaniac said:
Any progress?
Click to expand...
Yes. Sorry for the late reply. So, something went wrong with the driver installation and I've had BSOD every time after the Windows logo. I've had to reinstall Windows, since the restore points were not working for some reason. I've done this process several times, trying to pin point the driver that was giving me BSOD: these are the only drivers left out of the initial 81 (check the attached image). The latency still kicks in while playing games or watching videos.
 

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