Re: Why is intr taking up so much cpu?

On 07/18/10 12:41, Kostik Belousov wrote:
> On Sun, Jul 18, 2010 at 12:21:00PM -0700, Doug Barton wrote:
>> 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?
> 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.

Ok, file attached.

-- 

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

	Computers are useless. They can only give you answers.
			-- Pablo Picasso