From owner-freebsd-current@FreeBSD.ORG Wed Nov 21 09:30:04 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5F53F16A46B for ; Wed, 21 Nov 2007 09:30:04 +0000 (UTC) (envelope-from askbill@conducive.net) Received: from conducive.net (conducive.net [203.194.153.81]) by mx1.freebsd.org (Postfix) with ESMTP id 2D60713C474 for ; Wed, 21 Nov 2007 09:30:04 +0000 (UTC) (envelope-from askbill@conducive.net) Received: from northpoint.bitshk.com ([202.64.125.90]:42788 helo=pb.local) by conducive.net with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.63 (FreeBSD)) (envelope-from ) id 1IuluE-000ILZ-TP for freebsd-current@freebsd.org; Wed, 21 Nov 2007 09:30:02 +0000 Message-ID: <4743FA99.3090308@conducive.net> Date: Wed, 21 Nov 2007 09:30:01 +0000 From: =?UTF-8?B?6Z+T5a625qiZIEJpbGwgSGFja2Vy?= User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.2) Gecko/20070221 SeaMonkey/1.1.1 MIME-Version: 1.0 To: freebsd-current@freebsd.org References: <20071120141403.GE81260@comp.chem.msu.su> <4743342A.10507@FreeBSD.org> <20071120140752.C884@192.168.1.107> <1195622463.53690.43.camel@xenon.stonehenge.sk> In-Reply-To: <1195622463.53690.43.camel@xenon.stonehenge.sk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: SCHED_ULE & niceness / rtprio X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2007 09:30:04 -0000 Michal Varga wrote: > On Tue, 2007-11-20 at 14:08 -1000, Jeff Roberson wrote: > >> I definitely knew about problems with positively niced tasks. I had not >> heard about the negative nice problems. This is my top priority as far as >> opensource goes. I've been unfortunately busy with other things however. >> I hope to get to this soon. >> >> Thanks, >> Jeff >> > Just for the record, I have one user here claiming the same symptoms. > His description exactly matches that of Yar Tikhiy, sound popping when > switching windows in Gnome, clicking url in browser, etc. But there are > few diferences: > > - Switching ULE for 4BSD does nothing for him, he says the sound > jerkiness is still there, unchanged. > > - He didn't play manually with any particular niceness, everything > running in default priorities. I let him test sound in totem, audacious > (with various buffer sizes), then mplayer from console, without GUI.. No > difference, sound pausing in every one. > > Another problem I see is that he is using the *exact* custom built and > tuned FreeBSD configuration that I've deployed on a number of other > machines and I just can't replicate any of the symptoms. From and old > Pentium 3, through x86 Athlons, dual core AMD64 (with either smp or up > kernel), some sort of Sempron+nforce3 - there is no single other place > I'm aware of that this happens, only this particular guys hardware. > > Did you guys with the symptoms tried to cross-check your hardware lists > to see if you don't have something in common? > > m. > > Here's something that *should* be unrelated, yet may shed some light.. OS X 10.3.9, not 'real *BSD, 1 GHz G4 1 GB RAM, video/audio playback in Flash, ordinarily smooth as silk, goes choppy when there is nought but the browser - and several ssh sessions running... Suspicion is the encryption workload of the ssh sessions, which are tailing -f the varnishd log, MTA logs, etc. of several servers. Very easily reproduced. Will try a comparison tonight in FreeBSD, as much as it pains me to even support such 'candy' on my headless server OS of choice ... Bill