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To: Peter Jeremy <peterjeremy@optushome.com.au>
From: des@ofug.org (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=)
Date: Thu, 27 Mar 2003 23:42:16 +0100
In-Reply-To: <20030327190504.GD11307@cirb503493.alcatel.com.au> (Peter
 Jeremy's message of "Fri, 28 Mar 2003 06:05:04 +1100")
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Subject: Re: Checksum/copy
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Peter Jeremy <peterjeremy@optushome.com.au> writes:
> >  Zeroing a 4096-byte page on an
> > SSE-enabled i386 should take no more than 35 SSE instructions
> The downside is that we need multiple implementations to take advantage
> of features available in different CPUs.

We already *have* multiple implementations for different CPUs in the
i386 family.  We stopped using all but a few of them early in the 5.0
cycle5D because they weren't SMP-safe, but the mechanism is still in
place (take a look at src/sys/i386/i386/{identcpu.c,support.s})

DES
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Dag-Erling Sm=F8rgrav - des@ofug.org