Why is intr taking up so much cpu?
Rui Paulo
rpaulo at FreeBSD.org
Sat Jul 17 18:24:38 UTC 2010
On 17 Jul 2010, at 19:04, Doug Barton wrote:
> On Sat, 17 Jul 2010, Rui Paulo wrote:
>
>>
>> On 17 Jul 2010, at 08:17, Doug Barton wrote:
>>
>>> This is happening after I open a flash video in firefox and watch it for
>>>> 15 minutes:
>>>
>>> root 20 -80 - 0K 160K WAIT 0 3:38 14.08% intr
>>>
>>> After this happens, my system goes into a death spiral and I have to shut it down.
>>>
>>> vmstat -i
>>> interrupt total rate
>>> irq1: atkbd0 10384 0
>>> irq9: acpi0 5 0
>>> irq14: ata0 153410 7
>>> irq15: ata1 58 0
>>> irq17: wpi0 534038 27
>>> irq20: hpet0 uhci0+ 2496833 129
>>> irq22: uhci2 66485 3
>>> cpu0:timer 19238037 999
>>> irq256: hdac0 189713 9
>>> cpu1:timer 19236431 999
>>> Total 41925394 2178
>>>
>>>
>>> Any suggestions? current (r210135), i386 smp. Dell C2D laptop.
>>
>> What's vmstat -i before the event happens?
>
> Here is the output after a clean boot:
>
> interrupt total rate
> irq1: atkbd0 424 4
> irq9: acpi0 2 0
> irq14: ata0 3266 30
> irq15: ata1 58 0
> irq17: wpi0 2012 18
> irq20: hpet0 uhci0+ 13763 129
> irq22: uhci2 16 0
> cpu0:timer 105150 991
> irq256: hdac0 10 0
> cpu1:timer 103716 978
> Total 228417 2154
>
> Thanks for the response,
This doesn't indicate any problem. I suggest you try to figure out what interrupt is causing this by adding printfs or disabling drivers one by one.
Regards,
--
Rui Paulo
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