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SubjectRe: [PATCH] cfq-prio #2

Jens Axboe wrote:

>On Tue, Nov 11 2003, Nick Piggin wrote:
>>Jens Axboe wrote:
>>>On Tue, Nov 11 2003, Nick Piggin wrote:
>>>>Its quite important. If the queue is full, and AS is waiting for a process
>>>>to submit a request, its got a long wait.
>>>>Maybe a lower limit for per process nr_requests. Ie. you may queue if this
>>>>queue has less than 128 requests _or_ you have less than 8 requests
>>>>outstanding. This would solve my problem. It would also give you a much
>>>>appropriate scaling for server workloads, I think. Still, thats quite a
>>>>change in behaviour (simple to code though).
>>>That basically belongs inside your may_queue for the io scheduler, imo.
>>You can force it to disallow the request, but you can't force it to allow
>>one (depending on a successful memory allocation, of course).
>Well that's back two mails then, make may_queue return whether you must
>queue, may queue, or can't queue.

Yep, sounds good. I'll make a patch for it for 2.6.x > 0 sometime unless
you beat me to it.

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