dummynet: waking up pipe

[Michael Spratt]

you should use vstat or something to see if its interrupts eating your cpu..

Luigi Rizzo wrote:
> On Fri, Jan 22, 2010 at 07:42:46PM +0300, Evgenii Davidov wrote:
>> ????????????,
>>
>> On Fri, Jan 22, 2010 at 02:46:28PM +0100, Luigi Rizzo ?????:
>>
>>> On Fri, Jan 22, 2010 at 04:35:35PM +0300, Evgenii Davidov wrote:
>>> ...
>>>>>>> my problem is that dummynet cpu usage jumps from 0 to 99%:
>>>>>>>
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.6H 86.18% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.6H 85.89% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.6H 88.28% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       0 512.6H 78.17% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       0 512.6H  0.88% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.6H  0.10% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.7H  0.00% dummynet
>>>>>>>    33 root        1 -68    -     0K     8K -       1 512.7H  0.10% dummynet
>>>>> i am not too clear on why this happens -- there shuold be only
>>>>> one instance of the dummynet thread, not 8 as in your case.
>>>> no-no, one instance, it's a grep of a top log
>>> ok then it's rather normal -- the task wakes up every millisecond and
>>> it might have hundreds of packets to send at once, especially when
>>> the machine is heavily loaded as in your case.
>> but since i restricted dummunet to run only on cpu 0 it's much better
>> maybe it's some smp problem in freebsd7
> 
> maybe the memory affinity helps a bit here.
> 
> cheers
> luigi
>> -- 
>> Evgenii V Davidov
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