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    SubjectRe: [PATCH] O6int for interactivity


    Wiktor Wodecki wrote:

    >On Fri, Jul 18, 2003 at 08:43:05PM +1000, Con Kolivas wrote:
    >
    >>On Fri, 18 Jul 2003 20:31, Wiktor Wodecki wrote:
    >>
    >>>On Fri, Jul 18, 2003 at 12:18:33PM +0200, Mike Galbraith wrote:
    >>>
    >>>>That _might_ (add salt) be priorities of kernel threads dropping too low.
    >>>>
    >>>>I'm also seeing occasional total stalls under heavy I/O in the order of
    >>>>10-12 seconds (even the disk stops). I have no idea if that's something
    >>>>in mm or the scheduler changes though, as I've yet to do any isolation
    >>>>and/or tinkering. All I know at this point is that I haven't seen it in
    >>>>stock yet.
    >>>>
    >>>I've seen this too while doing a huge nfs transfer from a 2.6 machine to
    >>>a 2.4 machine (sparc32). Thought it'd be something with the nfs changes
    >>>which were recently, might be the scheduler, tho. Ah, and it is fully
    >>>reproducable.
    >>>
    >>Well I didn't want to post this yet because I'm not sure if it's a good
    >>workaround yet but it looks like a reasonable compromise, and since you have a
    >>testcase it will be interesting to see if it addresses it. It's possible that
    >>a task is being requeued every millisecond, and this is a little smarter. It
    >>allows cpu hogs to run for 100ms before being round robinned, but shorter for
    >>interactive tasks. Can you try this O7 which applies on top of O6.1 please:
    >>
    >>available here:
    >>http://kernel.kolivas.org/2.5
    >>
    >
    >sorry, the problem still persists. Aborting the cp takes less time, tho
    >(about 10 seconds now, before it was about 30 secs). I'm aborting during
    >a big file, FYI.
    >

    OK if the IO actually stops then it shouldn't be an IO scheduler or
    request allocation problem, but could you try to capture a sysrq T
    trace for me during the freeze.

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