From owner-freebsd-stable@FreeBSD.ORG Tue Oct 16 19:22:43 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 561D416A468; Tue, 16 Oct 2007 19:22:43 +0000 (UTC) (envelope-from kris@FreeBSD.org) Received: from weak.local (hub.freebsd.org [IPv6:2001:4f8:fff6::36]) by mx1.freebsd.org (Postfix) with ESMTP id 8213E13C448; Tue, 16 Oct 2007 19:22:42 +0000 (UTC) (envelope-from kris@FreeBSD.org) Message-ID: <47150F82.9060805@FreeBSD.org> Date: Tue, 16 Oct 2007 21:22:42 +0200 From: Kris Kennaway User-Agent: Thunderbird 2.0.0.6 (Macintosh/20070728) MIME-Version: 1.0 To: "[LoN]Kamikaze" References: <47150D87.3070804@gmx.de> In-Reply-To: <47150D87.3070804@gmx.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: SCHED_4BSD in RELENG_7 disturbs workflow X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Oct 2007 19:22:43 -0000 [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