Re: 4BSD process starvation during I/O
From: David Xu (davidxu_at_freebsd.org)
Date: 11/24/05
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Date: Thu, 24 Nov 2005 08:10:40 +0800 To: Kris Kennaway <kris@obsecurity.org>
Kris Kennaway wrote:
>On Thu, Nov 24, 2005 at 07:52:30AM +0800, David Xu wrote:
>
>
>>Kris Kennaway wrote:
>>
>>
>>
>>>Perhaps this can be tweaked.
>>>
>>>Kris
>>>
>>>P.S. Please, no responses about how maybe someone could write a new
>>>scheduler that doesn't have this property.
>>>
>>>
>>>
>>>
>>>
>>>
>>Can you try it again with FULL_PREEMPTION is turned on ?
>>
>>
>
>OK. Is this option believed to be "safe" (i.e. largely free from
>bugs), and would it be useful to test more widely?
>
>Kris
>
>
>
I didn't test it on big machine. if I remembered it correctly, we only
do preemption at user boundary if the FULL_PREEMPTION is turned off,
you know system thread won't go to user boundary. :-)
David Xu
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