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    SubjectRe: [PATCH] SCHED_FIFO and SCHED_RR scheduler fix, kernel 2.2.21
    Alan Cox wrote:
    >>The 2.2.21 kernel was behaving incorrectly for SCHED_FIFO and SCHED_RR
    > Looks fine but I dont want to apply behaviour changing non critical stuff
    > to 2.2

    Oh, no!

    What's going on with the kernel community? I posted a similar fix for
    the 2.4.18 kernel, and it hasn't been picked up there either.

    For the 2.4.18 kernel scheduler, our 86 process application (SCHED_FIFO,
    priorities 7-23, System V semaphores for priority preemption) won't even
    stay up without my patch.

    The 2.2.21 SCHED_FIFO behaviour is correct but slightly inefficient,
    while the SCHED_RR behaviour is plain broken. What is an application
    that depends on correct SCHED_RR behaviour to do in that case? There are
    applications where increased latencies as a result of SCHED_RR being
    broken are unacceptable.

    Bhavesh P. Davda
    Avaya Inc
    Room B3-B03 E-mail :
    1300 West 120th Avenue Phone : (303) 538-4438
    Westminster, CO 80234 Fax : (303) 538-3155

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