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Date: Sat, 20 Jan 2007 21:51:03 +0000
From: David Malone <dwmalone@maths.tcd.ie>
To: Bruce Evans <bde@zeta.org.au>
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Cc: Attilio Rao <attilio@freebsd.org>, freebsd-current@freebsd.org,
	Ivan Voras <ivoras@fer.hr>, freebsd-arch@freebsd.org
Subject: Re: Optimized copy&move (was: Re: [PATCH] Mantaining turnstile
	aligned to 128 bytes in i386 CPUs)
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On Thu, Jan 18, 2007 at 11:16:19AM +1100, Bruce Evans wrote:
> - the FPU routines are faster on Athlons (XP and 64 at least), but these
>   didn't exist until 2001.  The introduction of these CPUs may have
>   been the trigger for turning off the FPU routines in -current in 2001.
>   Until then problems were limited to Pentium-1's since the dynamic
>   configuration prevented the routines being used on all other machines.

I think a very quirky K6-2 machine that I had let us reproduce the
problem fairly dependably and may have been part of the reason it
was finally turned off.

	David.