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    SubjectRe: RFC on io-stalls patch


    On Mon, 14 Jul 2003, Jens Axboe wrote:

    > On Sun, Jul 13 2003, Andrea Arcangeli wrote:
    > > On Sun, Jul 13, 2003 at 11:01:16AM +0200, Jens Axboe wrote:
    > > > No I don't have anything specific, it just seems like a bad heuristic to
    > > > get rid of. I can try and do some testing tomorrow. I do feel strongly
    > >
    > > well, it's not an heuristic, it's a simplification and it will certainly
    > > won't provide any benefit (besides saving some hundred kbytes of ram per
    > > harddisk that is a minor benefit).
    >
    > You are missing my point - I don't care about loosing the extra request
    > list, I never said anything about that in this thread. I care about
    > loosing the reserved requests for reads. And we can do that just fine
    > with just holding back a handful of requests.
    >
    > > > that we should at least make sure to reserve a few requests for reads
    > > > exclusively, even if you don't agree with the oversized check. Anything
    > > > else really contradicts all the io testing we have done the past years
    > > > that shows how important it is to get a read in ASAP. And doing that in
    > >
    > > Important for latency or throughput? Do you know which is the benchmarks
    > > that returned better results with the two queues, what's the theory
    > > behind this?
    >
    > Forget the two queues, noone has said anything about that. The reserved
    > reads are important for latency reasons, not throughput.

    So Jens,

    Please bench (as you said you would), and send us the results.

    Its very important.

    Thanks
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