Why is intr taking up so much cpu?

Doug Barton dougb at FreeBSD.org
Sat Jul 17 19:23:26 UTC 2010

On Sat, 17 Jul 2010, Kostik Belousov wrote:

> Note that intr time most likely come from the interrupt threads chewing
> the CPU, not from the real interrupt handlers doing something, and definitely
> not due to the high interrupt rate, as your vmstat -i output already shown.
> Run top in the mode where all system threads are shown separately
> (e.g. top -HS seems to do it), then watch what thread eats the processor.

Ok, thanks, I'll definitely do that next time and report the results.



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