Many mfgpt timer interrupts with tickless kernel
jordan.crouse at amd.com
Thu Mar 22 13:41:15 EDT 2007
On 22/03/07 18:26 +0100, Jens Axboe wrote:
> The tickless kernel just _enables_ low number of interrupts per second,
> it'll still wakeup everytime something is scheduled to run. So you
> probably want to look into _why_ th timer interrupts happen so often -
> who is the user of them?
> I see ~70 interrupts/sec here with an idle machine in X, FWIW.
I've seen it as low as 10 on a very very quiet machine. Enable the timer
statistics and run a sample - I'll bet you see some offenders like the
console cursor, the libertas, and other such greedy consumers of our time.
Senior Linux Engineer
Advanced Micro Devices, Inc.
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