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Using LatencyMon And DPC Latency Checker To Find Driver Problems

Written by: Oliver Krautscheid - Published: Tuesday, March 13th, 2012

Latencymon High Latency And PagefaultDrivers problem can occur frequently and IRQL conflicts are even worse. Using LatencyMon you can quickly identify your problem.

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1. Step Download LatencyMon from here, scroll down and download the free home edition

2. Step Also download the DPC Latency Checker

3. Step Run LatencyMon by clicking the green arrow at the top

Let it run for 2 minutes

Latencymon High Latency And Pagefault

LatencyMon will display your hard pagefault, ISR execution time, DPC execution time, kernel timer latency and the highest measured kernel timer latency. You can get more information when you click on Stats

4. Step Click on the Drivers field at the top. Sort the drivers by highest execution time to find slow drivers. Also sort by ISR and DPC count. DPC stands for Deferred Procedure Calls, you can look it up on Wikipedia for a good explanation. In short, low priority tasks can be “deferred” (delayed) using a DPC. However, this can cause latency to go up.

Another important value to look at is your page fault number. A high number or latency indicates that your computer has a trouble with your memory management. It’s possible that illegal accesses, exceptions in programs can result in page faults. So, it’s possible that a program or corrupt driver is causing it. Thus, you can only speed up your PC if you find out what process/driver is causing the problems.

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Written by: Oliver Krautscheid
Oliver is the founder and lead editor of this site. He is interested in finding new ways to break Windows, find common errors and help others to fix them. Aside from that, he loves to fully customize systems with Rainmeter and Dreamscene, find out more about ancient civilizations like the Chachapoya, sharpen his digital photography skills and create software with a small group of selected developers. If you would like to connect with him to discuss anything, send him a mail!

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