Date: Fri, 22 Dec 2006 13:09:48 +0900 From: "Adrian Chadd" <adrian@freebsd.org> To: "David Xu" <davidxu@freebsd.org> Cc: freebsd-performance@freebsd.org, Mark Kirkwood <markir@paradise.net.nz> Subject: Re: Cached file read performance Message-ID: <d763ac660612212009x30bab8d6kecec9bc2e49a2b66@mail.gmail.com> In-Reply-To: <458B3E0C.6090104@freebsd.org> References: <458B3651.8090601@paradise.net.nz> <458B3E0C.6090104@freebsd.org>
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On 22/12/06, David Xu <davidxu@freebsd.org> wrote: > I suspect in such a test, memory copying speed will be a key factor, > I don't have number to back up my idea, but I think Linux has lots > of tweaks, such as using MMX instruction to copy data. I had the oppertunity to study the AMD Athlon XP Optimisation guide and noted their example copy routine, optimised for the chipset, was quite a hell of a lot faster over a straight block copy. Has anyone here done any similar modifications to optimise copyin/copyout? I can't imagine it'd be a bad thing to have. Adrian
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