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Using Xperf to investigate slow I/O issues

Debuggers, Here’s another short video of the type of triage possible with Xperf, this time Bob shows us how to track down a slow I/O issue. Since I/O Manager is instrumented at IoCallDriver and IoCompleteRequest we can often use this information to diagnose Read More...
Posted Monday, August 17, 2009 1:38 PM by ntdebug | 0 Comments
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How it Works: DLL Injection

Introduction Hi everyone, this is Bob again. I recently worked on an issue where the interaction of two threads in Winlogon led to a bugcheck. One thread was a Winlogon thread initializing GDI. The interesting thing about this scenario is how the other Read More...
Posted Friday, June 20, 2008 7:01 PM by ntdebug | 7 Comments
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Work Queues and Dispatcher Headers

Introduction Hi everyone, Bob here again with a description of Work Queues and Dispatcher Headers. For those of you that look at dumps, you may have noticed that there are always threads waiting at KeRemoveQueue . You may have wondered what this function Read More...
Posted Wednesday, May 07, 2008 10:55 PM by ntdebug | 1 Comments
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Where the rubber meets the road, or in this case the hardware meets the probe.

Hi my name is Bob, I’m an Escalation engineer with the Microsoft critical problem resolution team. We had one of our readers ask how much we deal with hardware. Well in response we recently worked on an interesting problem I thought I would share with Read More...
Posted Friday, June 22, 2007 2:37 PM by ntdebug | 1 Comments
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