Re: Why is intr taking up so much cpu?

From: Dan Nelson <dnelson_at_allantgroup.com> Date: Sun, 18 Jul 2010 15:53:36 -0500 · This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:40:05 UTC

In the last episode (Jul 18), Dan Nelson said:
> In the last episode (Jul 18), Doug Barton said:
> > On 07/18/10 12:41, Kostik Belousov wrote:
> > > When intr time starts accumulating again, try to do
> > > "procstat -kk <intr process pid>" and correlate the clock thread tid
> > > with the backtrace. Might be, it helps to guess what callouts are eating
> > > the CPU.
> > 
> > Will do, thanks!
> 
> You can also use dtrace to get a count of callouts and their time spent. 
> Run this for a few seconds then hit ^C:

That may actually be too verbose (you'll get a histogram per callout).  Try
the ones at http://wiki.freebsd.org/DTrace/Examples instead.

-- 
	Dan Nelson
	dnelson_at_allantgroup.com