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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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      Last update: 2005-03-22 13:58    [W:0.022 / U:7.204 seconds]
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