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Re: FPU emulator unsafe for SMP?

To: Dominic Sweetman <dom@algor.co.uk>
Subject: Re: FPU emulator unsafe for SMP?
From: Florian Lohoff <flo@rfc822.org>
Date: Wed, 20 Feb 2002 10:30:12 +0100
Cc: Jun Sun <jsun@mvista.com>, "Kevin D. Kissell" <kevink@mips.com>, linux-mips@oss.sgi.com
In-reply-to: <15475.24039.877276.257999@gladsmuir.algor.co.uk>
Organization: rfc822 - pure communication
References: <3C6C6ACF.CAD2FFC@mvista.com> <20020215031118.B21011@dea.linux-mips.net> <20020214232030.A3601@mvista.com> <20020215003037.A3670@mvista.com> <002b01c1b607$6afbd5c0$10eca8c0@grendel> <20020219140514.C25739@mvista.com> <00af01c1b9a2$c0d6d5f0$10eca8c0@grendel> <20020219171238.E25739@mvista.com> <15475.24039.877276.257999@gladsmuir.algor.co.uk>
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On Wed, Feb 20, 2002 at 08:27:19AM +0000, Dominic Sweetman 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.

Flo
-- 
Florian Lohoff                  flo@rfc822.org             +49-5201-669912
Nine nineth on september the 9th              Welcome to the new billenium

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