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    SubjectRe: realtime-preempt and arm

    * tike64 <tike64@yahoo.com> wrote:

    > Steven Rostedt <rostedt@goodmis.org> wrote:
    > > Also, have you tried this with a nanosleep instead of a select.
    > > Select's timeout is just that, a timeout. It's not suppose to be
    > > accurate, as long as it doesn't expire early. The reason I state
    > > this, is that select uses a different mechanism than nanosleep, and
    > > that can indeed affect the jitter.
    >
    > Ok, understood; I tried this:
    >
    > t = raw_timer();
    > ts.tv_nsec = 5000000;
    > ts.tv_sec = 0;
    > nanosleep(&ts, 0);
    > t = raw_timer() - t;
    >
    > It is better but I still see 8ms occasional delays when listing
    > nfs-mounted directories onto FB. And, what is funny, also this version
    > makes the average delay 20ms as if it made the jiffy 20ms.

    ARM has no high resolution timers support yet in the -rt tree.

    Ingo
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