From owner-freebsd-multimedia  Wed Oct 13 15:35:50 1999
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To: van.woerkom@netcologne.de
Cc: scrappy@hub.org, insane@lunatic.oneinsane.net,
	freebsd-multimedia@FreeBSD.ORG
Subject: Re: xmms error 
In-reply-to: Message from <van.woerkom@netcologne.de> of Wed Oct 13, 1999 23:41 +0200
             <199910132141.XAA53124@oranje.my.domain> 
Date: Wed, 13 Oct 1999 18:35:19 -0400
From: Daniel McRobb <dwm@caida.org>
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> > Add the following to your kernel config and install:
> > 
> > options         "P1003_1B"
> > options         "_KPOSIX_PRIORITY_SCHEDULING"
> > options         "_KPOSIX_VERSION=199309L"
> 
> But what does this change?
> Just some additional hooks in the kernel, or does
> it behave differently?
> 
> Or asked the other way - are there drawbacks related?
> 
> 
> Regards,
> Marc
> 
> 
> 
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It adds POSIX-style priority scheduling capabilities to your kernel.  I
haven't seen any kernel issues with it, and I've had it in my kernel for
a long time.  There aren't very many end-user programs that make calls
to sched_setscheduler(), but xmms does.  One of my own programs does
too, and I've had no problems.  OF course, leaving it out is generally
harmless too, since sched_setscheduler() is a no-op (well, a log
message) when your kernel doesn't have POSIX_PRIORITY_SCHEDULING.
Assuming xmms still runs O.K. without it, of course.

Daniel
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