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My driver needs to send an Ethernet packet every 250ms for synchronization to other hardware. I have a user mode app for testing which gives very good performance using the chrono high resolution clock in c++. But when I try to bring the timer into my driver using KeQueryUnbiasedInterruptIme to query the time and KeDelayExecutionThread for the delay, the resolution is far from acceptable and varies by several milliseconds (intervals of 247ms to 258ms). I also tried KeQueryPerformanceCounter and had about the same results. Is there a better approach, or would you expect this to work as well as the user mode app and assume that I’m not implementing it correctly in the driver?
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