Date: Sat, 20 Jan 2007 21:51:03 +0000 From: David Malone <dwmalone@maths.tcd.ie> To: Bruce Evans <bde@zeta.org.au> 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) Message-ID: <20070120215103.GA93101@walton.maths.tcd.ie> In-Reply-To: <20070118094808.F11834@delplex.bde.org> References: <eoji7s$cit$2@sea.gmane.org> <b1fa29170701161425n7bcfe1e5m1b8c671caf3758db@mail.gmail.com> <eojlnb$qje$1@sea.gmane.org> <b1fa29170701161534n1f6c3803tbb8ca60996d200d9@mail.gmail.com> <eojok9$449$1@sea.gmane.org> <20070117134022.V18339@besplex.bde.org> <20070117224812.Q23194@besplex.bde.org> <45AE7BF8.10703@fer.hr> <3bbf2fe10701171315g696bca4fi3bf676b62c06f4d@mail.gmail.com> <20070118094808.F11834@delplex.bde.org>
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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.
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