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    SubjectRe: x264 benchmarks BFS vs CFS
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    On Thu, 2009-12-17 at 17:18 -0800, Jason Garrett-Glaser wrote:
    > On Thu, Dec 17, 2009 at 3:00 AM, Kasper Sandberg <lkml@metanurb.dk> wrote:
    > > On Thu, 2009-12-17 at 11:53 +0100, Ingo Molnar wrote:
    > >> * Jason Garrett-Glaser <darkshikari@gmail.com> wrote:
    > >>
    > >> > On Thu, Dec 17, 2009 at 1:33 AM, Kasper Sandberg <lkml@metanurb.dk> wrote:
    > >> > > well well :) nothing quite speaks out like graphs..
    > >> > >
    > >> > > http://doom10.org/index.php?topic=78.0
    > >> > >
    > >> > >
    > >> > >
    > >> > > regards,
    > >> > > Kasper Sandberg
    > >> >
    > >> > Yeah, I sent this to Mike a bit ago. Seems that .32 has basically tied
    > >> > it--and given the strict thread-ordering expectations of x264, you basically
    > >> > can't expect it to do any better, though I'm curious what's responsible for
    > >> > the gap in "veryslow", even with SCHED_BATCH enabled.
    > >> >
    > >> > The most odd case is that of "ultrafast", in which CFS immediately ties BFS
    > >> > when we enable SCHED_BATCH. We're doing some further testing to see exactly
    > >
    > > Thats kinda besides the point.
    > >
    > > all these tunables and weirdness is _NEVER_ going to work for people.
    >
    > Can't individually applications request SCHED_BATCH? Our plan was to
    > have x264 simply detect if it was necessary (once we figure out what
    > encoding settings result in the large gap situation) and automatically
    > enable it for the current application.
    that is an insane solution, especially considering better schedulers
    outperform cfs SCHED_BATCH without doing ANYTHING special.

    Do you not see what is happening here? it is simply grotesk
    >
    > Jason



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