Many mfgpt timer interrupts with tickless kernel

[Jens Axboe]

On Thu, Mar 22 2007, Jordan Crouse wrote:
> 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.

Yep that'd be the way to go, looking at the timer stats.

-- 
Jens Axboe