On Tue, 16 Oct 2007, Kris Kennaway wrote:
[LoN]Kamikaze wrote:
I know that RELENG_7 is not considered very near-release, but I thought I'd
give my 2ยข in the hope that I might have a little influence on the
scheduler
development to my benefit.
The switch from RELENG_6 to RELENG_7 went relatively smooth and apart from
ipw
causing panics. However there is one thing that's disturbing and this is
the
scheduler. I only have single core machines, so whatever I say only applies
to
those. If you think single-core machines are no longer important, feel free
to
ignore this. In deed, just ignore me however much you like.
From my perspective scheduling on RELENG_6 was way better. Even on a full
workload like a portupgrade the focused application (both in X and on the
console) always received enough cycles to run smoothly and applications
that
ran in background like audio players also kept on running fine.
Quite the contrary on RELENG_7. During a portupgrade or even worse 'pkgdb
-L'
(recovering lost dependencies) audio players (both graphical and mplayer)
scatter, either because they don't get the hard-disk or CPU-cycles (which
one,
I don't know) and the focused application also often hangs. It just looks
like
occasionally (under load) everything freezes for a second and then goes on
relatively normal.
I've got the impression that things compile a little faster (that might be
my
imagination, though), but I'd rather have a smooth working experience.
This is just my view of the situation and I suppose it is only one of many.
I
bid you be merciful with us single-core people, who cannot afford a slick
multi-core machine, because we worry how to pay for our food at the end of
the
month.
Not to say that any problems that might have developed with SCHED_4BSD should
not be fixed, but you should give SCHED_ULE a try since it brings benefits
even for single CPU systems (e.g. better interactive response).
It would indeed be good to know if ULE improves things for you. However,
there have been a number of other reports about non-scheduler related
regressions with x windows on 7.0. I run 7.0 on a UP laptop without
difficulty. I wonder if it has something to do with a particular device
or driver.
Jeff
Kris
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