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Questions tagged [dpc]

DPC (Deferred Procedure Call) is a mechanism adopted by Microsoft which allows high-priority tasks on Windows (such as an interrupt handler) to defer required but lower-priority tasks for later execution.

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1 answer
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What might be causing periodic audio pops and crackles in certain Windows 10 applications?

I have an Intel NUC10i7FNH computer, purchased in December 2019 and running Windows 10. Within the last year, it has started to produce audio crackles and pops during many different types of audio ...
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0 answers
112 views

DPC WatchDog Violation after Selenium is ran with python

I have recently decided to move my web automation scripts from Google Colab where they worked fine, to my own PC. After getting the correct webdriver(for chrome, version 89), I tried launching a ...
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0 answers
59 views

I keep getting the DPC_Watchdog_Violation BSoD and I don't know how to fix it. (Windows 10)

I keep getting the DPC_Watchdog_Violation BSOD (Bugcheck: 133) I tried all of these solutions: Updating Drivers chkdsk C: /f in cmd chkdsk C: /r in cmd sfc /scannow in cmd Resetting BIOS Full system ...
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0 votes
1 answer
308 views

System interrupts/DPC/ISR appear to be causing sound distortion in Windows 10. How can I determine the root cause?

I am having problems with audio distortion in Windows 10, but it varies in severity between apps. Foobar2000 is very heavily distorted on most tracks, with buzzes and skips. Windows Media Player also ...
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0 votes
1 answer
240 views

BSOD with DPC_WATCHDOG_VIOLATION

For the last week I'm suffering from a hand and BSOD in Windows 10 Pro. I didn't changed hardware and I cannot remember any update, but it is possible Windows updated my computer while shutting down (...
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1 vote
1 answer
3k views

DPC Latency issues caused by storport.sys

I have been having an issue with DPC latency. I have spent hours trying to figure out how to fix it, but I have failed to find a solution. To begin, I first noticed this issue after I cloned my ...
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3 votes
1 answer
452 views

Windows 10 audio stuttering/cracking issues

I know there are quite a few threads open for this issue but after hours of research and trial and error I haven't found a solution yet. Plus I'm not that much into the internals of Windows and can't ...
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0 votes
0 answers
343 views

DPC latency issue

My Asus ROG laptop (i7-6700HQ, GTX960M, 8GB DDR4, 1TB Samsung 850Evo SATA SSD, Win10 64bit) has been painfully slow, sometimes at its worst even slightly moving the mouse takes 5 seconds. Playing ...
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10 votes
4 answers
18k views

High DPC latency Windows 10, unable to fix

Edit: I am still experiencing this issue. ndis.sys is causing issues and I have not been able to resolve it. I am at a loss of what to do. I have tried reinstalling windows AGAIN, reinstalling drivers ...
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5 votes
1 answer
6k views

What is DPC Watchdog?

OK, so DPC_WATCHDOG_VIOLATION is a common Error code after a BSOD. I'd like to know - What is a DPC Watchdog? I mean, what is meant by that? What does it do in the Windows system? And how does it ...
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3 votes
3 answers
11k views

NDIS.SYS driver very high latency in Windows 10

I have upgraded my computer from Windows 8.1 to Windows 10. The installation went well, no problem occurred. My motherboard is a Gigabyte GA-B75M-D3H. After the install, I updated the Realtek drivers ...
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0 votes
0 answers
534 views

Fresh Win7 installed with SSD. All known drivers updated - high hard pagefaults

I previously had a thread with nasty pagefaults where the main culprit was my HDD was actually failing. I received a new SSD this week and reinstalled Windows 7, since then things have been insanely ...
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1 vote
1 answer
1k views

Computer slows down during downloads

Last week, I reinstalled my company laptop, a HP Pavilion dv7-6b22ed. Everything was installed okay, but there is one issue I can't solve: whenever I download a file, be it a several hunderd MB file ...
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0 votes
2 answers
5k views

DPC_WATCHDOG_VIOLATION on Windows 8.1 only when I Restart the PC

I am getting the dreaded DPC_WATCHDOG_VIOLATION on a newly setup Windows 8.1 rig. It uses a Gigabyte H87-HD3 Motherboard, i5 4570, 16GB RAM and has a Kingston 240GB SSD (no other h/w on the M/b). ...
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0 votes
0 answers
421 views

I'm having DPC latency issues with my computer

The LatencyMon report will be added to the end of this. I recently got a modi and magni amp and dac combo and I've had audio stuttering issues. Here is a image of all my drivers I was told that I ...
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  • 225
4 votes
1 answer
3k views

Intel 3945ABG DPC spikes (audio stutter, mouse) in Windows 8.1

As reported by many users, Intel WiFi chips such as 3945ABG and the later 4965 may experience CPU spikes due to DPC activity. This is typically experienced as: Audio stuttering. Uninterrupted ...
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4 votes
0 answers
2k views

Windows 8 audio stutters. DPC Latency high on tcpip.sys

I own a Intel Core i5 760 CPU based PC. 16Gb of RAM, AMD Radeon HD 7850, Asus Xonar DSX audio card, and a Creative Sound Blaster Sigma headset (with USB audio device). It's just to enumerate all my ...
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  • 576
0 votes
0 answers
886 views

High Interrupt DCP processor take

I have a quad core laptop with win7. Around 3 months ago the laptop occasionally slowed down. Resource Monitor and Process Explorer show that processor 0 was 100% busy with DCP and Interrupts. A ...
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1 vote
1 answer
2k views

How can I reduce high CPU usage from DPC's with USB Serial Ports

I have an app that communicates with up to 50 devices over serial ports. The communication takes place in threads, and the threads are throttled so that only a certain number are active at once. ...
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8 votes
2 answers
8k views

How do I analyze excessive Windows kernel mode CPU usage?

My Windows XP machine recently started to semi freeze on me every odd reboot after a few minutes of usage (different programs / no additional prg start at all). Update: I have now managed to get a ...
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1 vote
0 answers
414 views

Usb wireless adapter causing DPC spikes

Bought 2 new TP-LINK WN722N USB wirless adapters as they were the highest rated on Newegg and were a great price. Both of them cause abnormally high DPC & Interrupt usage in Process Explorer and ...
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5 votes
1 answer
2k views

Hardware interrupts and system unresponsiveness

Very occasionally, about once a week, my Windows Vista Business machine will completely lock up for anything between a minute and several minutes. Once this happens, it recurs more frequently until I ...
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41 votes
6 answers
21k views

How do I get to the root cause of high Deferred Procedure Calls?

I've got a Dual core processor, and one of the two is constantly at 100%. Looking in ProcessExplorer shows me that it's Deferred Procedure Calls. Reading around the net seems to give me tons of ...
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1 vote
2 answers
1k views

Are DPC latency issues improved with multiple cores?

DPC latency checker says A device driver cannot process data immediately in its interrupt routine. It has to schedule a Deferred Procedure Call (DPC) which basically is a callback routine ...
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1 vote
1 answer
928 views

Firewire audio dropouts Dell Vostro 3500

This question is actually answered, I'm putting it up here since other people might be running into this and it's ultra annoying. Hardware/software involved: RME Fireface 400 firewire audio interface ...
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  • 21
1 vote
1 answer
1k views

DPC latency spikes every 60 seconds related to Dell 1515 (atheros) WLAN

I'm getting DPC latency spikes every 60 seconds related to Dell 1515 (atheros) WLAN. If you turn off the wireless card, the spikes go away. If you disable wireless autodiscovery, they go away. I've ...
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