Date: Thu, 27 Mar 2003 23:42:16 +0100 From: des@ofug.org (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: cvs-all@freebsd.org Subject: Re: Checksum/copy Message-ID: <xzpof3wv3cn.fsf@flood.ping.uio.no> In-Reply-To: <20030327190504.GD11307@cirb503493.alcatel.com.au> (Peter Jeremy's message of "Fri, 28 Mar 2003 06:05:04 %2B1100") References: <Pine.BSF.4.21.0303260956250.27748-100000@root.org> <20030326225530.G2075@odysseus.silby.com> <20030327180247.D1825@gamplex.bde.org> <xzp7kalw5j4.fsf@flood.ping.uio.no> <20030327190504.GD11307@cirb503493.alcatel.com.au>
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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
--
Dag-Erling Smørgrav - des@ofug.org
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