Date: Sat, 23 Dec 2006 17:40:25 +0100 From: "Attilio Rao" <attilio@freebsd.org> To: "David Xu" <davidxu@freebsd.org> Cc: Mark Kirkwood <markir@paradise.net.nz>, Alexander Leidinger <Alexander@leidinger.net>, Adrian Chadd <adrian@freebsd.org>, freebsd-performance@freebsd.org, Bruce Evans <bde@zeta.org.au> Subject: Re: Cached file read performance Message-ID: <3bbf2fe10612230840u7ffb2855y8d6151d2f24ace4@mail.gmail.com> In-Reply-To: <200612231321.52178.davidxu@freebsd.org> References: <458B3651.8090601@paradise.net.nz> <20061222222757.G18486@delplex.bde.org> <20061222202933.709d2279@Magellan.Leidinger.net> <200612231321.52178.davidxu@freebsd.org>
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2006/12/23, David Xu <davidxu@freebsd.org>: > On Saturday 23 December 2006 03:29, Alexander Leidinger wrote: > > > I want to point out http://www.freebsd.org/projects/ideas/#p-memcpy > > here. Just in case someone wants to play around a little bit. > > > > Bye, > > Alexander. > > I have read the code, if a buffer is not aligned at 16 bytes boundary, > it will not use FPU to copy data, but user buffer is not always 16 bytes > aligned. If the buffer is not aligned, speedup improvement is so small to be near at 0%. Attilio -- Peace can only be achieved by understanding - A. Einstein
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