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    SubjectRe: 2.6.27.8 scheduler bug - threads not being scheduled for long periods
    Peter,

    On Mon, Jan 05, 2009 at 04:36:21PM -0600, Dimitri Sivanich wrote:
    > And sure enough, the rq->clock is sometimes going backwards.
    >
    > The comment for sched_clock() in arch/ia64/kernel/head.S:
    > * Return a CPU-local timestamp in nano-seconds. This timestamp is
    > * NOT synchronized across CPUs its return value must never be
    > * compared against the values returned on another CPU. The usage in
    > * kernel/sched.c ensures that.
    >
    > We will try this with CONFIG_HAVE_UNSTABLE_SCHED_CLOCKS.
    >

    The testcase does indeed run with CONFIG_HAVE_UNSTABLE_SCHED_CLOCKS configured.


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