Why is intr taking up so much cpu?

Doug Barton dougb at FreeBSD.org
Sun Jul 18 19:21:02 UTC 2010

On 07/18/10 03:30, Kostik Belousov wrote:
> On Sun, Jul 18, 2010 at 01:14:41AM -0700, Doug Barton wrote:
>> On Sat, 17 Jul 2010, Kostik Belousov wrote:
>>> 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.
>> And the winner is!
>>    11 root       -32    -     0K   168K WAIT    0   0:28 18.02% {swi4: 
>>    clock}
>>    11 root    21 -64    -     0K   168K WAIT    0   1:17 18.90% intr
>> The first is with -H, the second without.
> Most likely it is some callout handling. Just in case, do you have
> console screensaver active ?

I assume you mean "saver=yes" in rc.conf, and the answer is no, I am not
using that. Usually I run xscreensaver, but at the time this happened I
was not. I do have DPMS enabled in my X config though.

Any suggestions on how to dig deeper on this? Are there any settings I
can twiddle to try and mitigate it?



	... and that's just a little bit of history repeating.
			-- Propellerheads

	Improve the effectiveness of your Internet presence with
	a domain name makeover!    http://SupersetSolutions.com/

More information about the freebsd-current mailing list