| 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> |
| Sender: | owner-linux-mips@oss.sgi.com |
| User-agent: | Mutt/1.3.27i |
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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