Date: Tue, 11 Feb 2003 13:15:34 -0800 From: Wesley Peters <wes@softweyr.com> To: Stijn Hoop <stijn@win.tue.nl>, Alfred Perlstein <bright@mu.org> Cc: "Thomas E. Zander" <riggs@rrr.de>, Alexandr Kovalenko <never@nevermind.kiev.ua>, Oliver Braun <obraun@freebsd.org>, ports-committers@freebsd.org, cvs-ports@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: ports/multimedia/mplayer Makefile distinfo pkg-plist ports/multimedia/mplayer/files patch-ad Message-ID: <200302111315.34462.wes@softweyr.com> In-Reply-To: <20030211100558.GB17571@pcwin002.win.tue.nl> References: <200302101928.h1AJS6Gs088748@repoman.freebsd.org> <20030211100013.GO88781@elvis.mu.org> <20030211100558.GB17571@pcwin002.win.tue.nl>
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On Tuesday 11 February 2003 02:05, Stijn Hoop wrote:
> On Tue, Feb 11, 2003 at 02:00:13AM -0800, Alfred Perlstein wrote:
> >
> > I would seem trivial to add a sysctl under machdep to tell userland
> > if sse is available and configured.
>
> OK, that would solve this problem, but what about my other question? Why
> not just detect if SSE is available, and use it, at runtime? Why do we
> need a kernel option for this?
Because, as you guessed, it affects per-process register storage and the
size (and therefore speed) of context switch. A kernel hint might be
possible, but would ick up the code considerably. It's worth considering.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
wes@softweyr.com http://softweyr.com/
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