Date: Tue, 16 Oct 2007 21:22:42 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: SCHED_4BSD in RELENG_7 disturbs workflow Message-ID: <47150F82.9060805@FreeBSD.org> In-Reply-To: <47150D87.3070804@gmx.de> References: <47150D87.3070804@gmx.de>
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[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). Kris
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