From: Ralf Baechle <ralf@oss.sgi.com>
To: Florian Lohoff <flo@rfc822.org>
Cc: Dominic Sweetman <dom@algor.co.uk>, Jun Sun <jsun@mvista.com>,
"Kevin D. Kissell" <kevink@mips.com>,
linux-mips@oss.sgi.com
Subject: Re: FPU emulator unsafe for SMP?
Date: Wed, 20 Feb 2002 14:56:49 +0100 [thread overview]
Message-ID: <20020220145649.H15588@dea.linux-mips.net> (raw)
In-Reply-To: <20020220093012.GF11654@paradigm.rfc822.org>; from flo@rfc822.org on Wed, Feb 20, 2002 at 10:30:12AM +0100
On Wed, Feb 20, 2002 at 10:30:12AM +0100, Florian Lohoff wrote:
> > It may be heretical... but the lazy FPU context switch was invented
> > for 16MHz CPUs using a write-through cache and non-burst memory, where
> > saving 16 x 64-bit registers took 6us or so (and quite a bit less,
> > later, to read them back). Call it 8us.
>
> We are still running on good ol Decstations *snief* Going the way to
> make it SMP only like others archs seem to do it would be good.
While I don't intend to kill support for any of the old machines like
DECstations as long as anybody keeps maintaining support for them
certainly performance tradeoffs in generic code will not be based on
antique systems ...
Ralf
next prev parent reply other threads:[~2002-02-20 15:03 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-15 1:56 FPU emulator unsafe for SMP? Jun Sun
2002-02-15 2:11 ` Ralf Baechle
2002-02-15 7:20 ` Jun Sun
2002-02-15 8:30 ` Jun Sun
2002-02-15 9:59 ` Kevin D. Kissell
2002-02-15 9:59 ` Kevin D. Kissell
2002-02-19 22:05 ` Jun Sun
2002-02-19 22:19 ` Ralf Baechle
2002-02-20 0:08 ` Kevin D. Kissell
2002-02-20 0:08 ` Kevin D. Kissell
2002-02-20 1:12 ` Jun Sun
2002-02-20 3:28 ` Greg Lindahl
2002-02-20 4:24 ` Jun Sun
2002-02-20 4:32 ` Daniel Jacobowitz
2002-02-20 9:48 ` Jun Sun
2002-02-20 10:14 ` Kevin D. Kissell
2002-02-20 10:14 ` Kevin D. Kissell
2002-02-20 13:50 ` Ralf Baechle
2002-02-20 20:53 ` Greg Lindahl
2002-02-20 13:24 ` Ralf Baechle
2002-02-20 4:48 ` Greg Lindahl
2002-02-20 9:27 ` Florian Lohoff
2002-02-20 13:18 ` Ralf Baechle
2002-02-20 9:56 ` Geert Uytterhoeven
2002-02-20 11:14 ` Kevin D. Kissell
2002-02-20 13:10 ` Ralf Baechle
2002-02-20 8:27 ` Dominic Sweetman
2002-02-20 9:30 ` Florian Lohoff
2002-02-20 13:56 ` Ralf Baechle [this message]
2002-02-20 13:09 ` Ralf Baechle
2002-02-20 14:42 ` Kevin D. Kissell
2002-02-20 14:42 ` Kevin D. Kissell
2002-02-20 14:46 ` Maciej W. Rozycki
2002-02-20 15:05 ` Ralf Baechle
2002-02-20 15:45 ` Maciej W. Rozycki
2002-02-20 13:03 ` Ralf Baechle
2002-02-15 8:14 ` Kevin D. Kissell
2002-02-15 8:14 ` Kevin D. Kissell
2002-02-15 10:57 ` Ralf Baechle
2002-02-19 22:02 ` Jun Sun
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