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    SubjectRe: Bad interactive behaviour in 2.5.65-66 (sched.c)
    At 08:35 AM 3/31/2003 +0200, Jens Axboe wrote:
    >On Mon, Mar 31 2003, Mike Galbraith wrote:
    > > At 07:06 AM 3/31/2003 +1000, Con Kolivas wrote:
    > > >On Mon, 31 Mar 2003 00:14, Jens Axboe wrote:
    > > >> On Sat, Mar 29 2003, Robert Love wrote:
    > > >> > On Sat, 2003-03-29 at 21:33, Con Kolivas wrote:
    > > >> > > Are you sure this should be called a bug? Basically X is an
    > > >interactive
    > > >> > > process. If it now is "interactive for a priority -10 process" then
    > > >it
    > > >> > > should be hogging the cpu time no? The priority -10 was a workaround
    > > >> > > for lack of interactivity estimation on the old scheduler.
    > > >> >
    > > >> > Well, I do not necessarily think that renicing X is the problem. Just
    > > >> > an idea.
    > > >>
    > > >> I see the exact same behaviour here (systems appears fine, cpu intensive
    > > >> app running, attempting to start anything _new_ stalls for ages), and I
    > > >> definitely don't play X renice tricks.
    > > >>
    > > >> It basically made 2.5 unusable here, waiting minutes for an ls to even
    > > >> start displaying _anything_ is totally unacceptable.
    > > >
    > > >I guess I should have trusted my own benchmark that was showing this was
    > > >worse
    > > >for system responsiveness.
    > >
    > > I don't think it's really bad for system responsiveness. I think the
    >
    >What drugs are you on? 2.5.65/66 is the worst interactive kernel I've
    >ever used, it would be _embarassing_ to release a 2.6-test with such a
    >rudimentary flaw in it. IOW, a big show stopper.

    It's only horrible when you trigger the problems, otherwise it's wonderful.

    > > problem is just that the sample is too small. The proof is that simply
    > > doing sleep_time %= HZ cures most of my woes. WRT contest and it's
    >
    >Irk, that sounds like a really ugly bandaid.

    Nope, it's a really ugly _tourniquet_ ;-)

    >I'm wondering why the scheduler guys aren't all over this problem,
    >getting it fixed.

    I think they are.

    -Mike

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