[Bug 110344] Performance regression in mpv

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110344

Jason Ekstrand <jason at jlekstrand.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #10 from Jason Ekstrand <jason at jlekstrand.net> ---
It's pretty clear what's going on here.  The change in a920979d4f30 caused RA
to either succeed or fail differently with respect to scheduling, so the
scheduling algorithm changed and the new scheduling is utterly horrible
compared to the old one.  In other words, our scheduler sucks.  Unfortunately,
this isn't news....  We've got a new scheduler in the works (in theory) which
will hopefully degrade more gracefully.

In the mean time for this particular bug, one could look into why it's failing
(or succeeding; I don't know) to register allocate with the a920979d4f30 and
maybe try to improve it.  It's entirely possible, however, that what *should*
be an improvement in RA is causing worse performance due to the terrible
scheduler.

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