Date: Tue, 27 May 2008 14:19:07 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG, unga888@yahoo.com Subject: Re: sched_ule performance on single CPU Message-ID: <200805271219.m4RCJ7Q6038124@lurza.secnetix.de> In-Reply-To: <555870.1659.qm@web57010.mail.re3.yahoo.com>
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Unga <unga888@yahoo.com> wrote: > When open an pdf has two types of scenarios in > FreeBSD: > 1. When X run as a realtime-prio process, X go mad and > swallow up almost all of CPU cycles, making audio > hiccups. That's expected. Running the X server with rtprio is not a good idea. There's no reason to do that. > 2. When X run as a normal-prio process, X behaves well > and rarely gets an audible hiccup. That's good. :-) > Why X behave different under different priority > categories? Isn't this scheduler related? Very simple: Sometimes the X server consumes lots of CPU for a short time. If it runs with rtprio, then no other process gets a chance to execute, so your audio program will starve. My recommendation is to not use rtprio or renice. I think many people who try to use them are making things worse. (In fact I think rtprio and idprio should die.) > I wonder the issue I mentioned, open a pdf while > playback audio, is it a issue on Apple Mac OSX? Could > somebody give some light here who uses an Apple Mac > OSX on this list? OSX has a vastly different kernel, scheduler, I/O system, audio drivers and so on. It's a completely different animal. Have you tried increasing the audio driver's buffersize? It probably helps to alleviate your problem. I think OSX sizes the buffer dynamically (not sure though). Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "When your hammer is C++, everything begins to look like a thumb." -- Steve Haflich, in comp.lang.c++
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