Date: Wed, 21 Nov 2007 09:30:01 +0000 From: =?UTF-8?B?6Z+T5a625qiZIEJpbGwgSGFja2Vy?= <askbill@conducive.net> To: freebsd-current@freebsd.org Subject: Re: SCHED_ULE & niceness / rtprio Message-ID: <4743FA99.3090308@conducive.net> In-Reply-To: <1195622463.53690.43.camel@xenon.stonehenge.sk> References: <20071120141403.GE81260@comp.chem.msu.su> <4743342A.10507@FreeBSD.org> <20071120140752.C884@192.168.1.107> <1195622463.53690.43.camel@xenon.stonehenge.sk>
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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
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