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33

Here is the story of how i found the cause of my high DPC latency. My system was experiencing clicks and pops during sound playback. i knew this meant that something in kernel mode was hogging the CPU. My first thought was to poke around Process Explorer, and see if anything looked out of place. The only thing that caught my attention was an excessive ...


12

PROGRESS REPORT The best tool I've found so far is LatencyMon, which basically does everything that the preceding two tools do, without making you think. The download page asks you to register via email - but nothing happened for me when I did that - but you can scroll to the bottom of the page to download anyway.


5

In my case I used LatencyMon (from Benjol's answer) and found that the driver freezing life, the universe, and everything was (also) storport.sys which is a Microsoft driver for "high performance buses". That confirmed my suspicious that the problem was IO related. I also went ahead and looked at my Windows 7 Event Viewer, folder Windows Logs -> ...


3

I feel I should add my answer here because this issue is difficult to solve and not always down to bad drivers or IRQ conflicts. I had high RPC latency that were causing pops/crackles in my pro-sumer USB soundcard. The tools described in the accepted answer were not helpful in identifying a particular driver that was causing an issue. The latency was ...


3

There's probably a device driver that's keeping your system busy. One way to analyze this is to run DPC latency checker. Then disable one driver at a time and see if the DPC load goes down. (Process explorer also works.) You can disable device drivers in Computer Management -> Device Manager.


2

The lit HDD LED is a sign for HDD data transfer. If you disk is set to "silent" you may not hear its activity. It could also be a communications error on the SATA (or IDE) cable. The Windows Event logs might have someting, if there are disk errors. Update: An error was detected on device \Device\Harddisk1\DR1 during a paging operation. SATA CRC ...


2

You can find out which DPC routine is causing the freezes by using a tool like LatencyMon (http://www.resplendence.com/latencymon). Simply look for the DPC routine taking the longest total time.


1

The high CPU usage stemmed from the fact that in the application each channel opened its serial port at the start of the session and kept it open for the duration of the application session. This was fine with ports based on the Moxa ethernet-to-COM Port adapters, or with "local" ports, but in USB ports, just having the port open causes DPC CPU usage. ...


1

Looks like you have an audio driver issue: ******************************************************************************* * * * Bugcheck Analysis * * ...


1

I'm assuming that your reference to DPC implies this is on a Windows platform. The page documenting Thesycon's DPC Latency Checker Tool http://www.thesycon.de/deu/latency_check.shtml has the following good advice when the driver responsible for DPC latency spikes has been identified: When you have identified the device driver which is responsible for ...


1

At first I suspected my audio settings both in the Fireface settings and in Sonar. I tried various combinations of buffer sizes and driver options, to largely no effect. I then looked into the firewire adapter. I found a lot of troubleshooting ideas online regarding RME devices and/or firewire adapters, such as: making sure your firewire adapter has a TI ...


1

I started seeing this error after resolving an IRQ error with my nVidia 10/100/1000 Ethernet controller that appeared when upgrading my graphics card to the GeForce GTX 550 Ti. It seems after the upgrade to the new GeForce drivers 295.73 and then resolving the interrupt conflict, I had removed, damaged or uninstalled existing nForce SATA/RAID controller ...



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