Date: Wed, 20 Dec 2006 22:37:32 +1300 From: Mark Kirkwood <markir@paradise.net.nz> To: JoaoBR <joao@matik.com.br> Cc: freebsd-stable@freebsd.org Subject: Re: Cached file read performance with 6.2-PRERELEASE Message-ID: <4589045C.1050206@paradise.net.nz> In-Reply-To: <200612200618.12826.joao@matik.com.br> References: <45888C68.10305@paradise.net.nz> <200612200618.12826.joao@matik.com.br>
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JoaoBR wrote: > On Tuesday 19 December 2006 22:05, Mark Kirkwood wrote: >> $ dd of=/dev/null if=/tmp/file bs=32k # read it >> 819200000 bytes transferred in 1.801944 secs (454620117 bytes/sec) >> > > > hum, look my releng_6: > # dd of=/dev/null if=/c/c1/file bs=32k > 819200000 bytes transferred in 0.896507 secs (913768635 bytes/sec) > Hmm - so your machine reads memory twice as fast as mine, which is great! but I'm not sure it actually shows anything useful ... let me guess - a P4 with DDR or DDR2 memory??? maybe if we look a bit harder at buffer cache performance you could get 1.2GB/s or more - wouldn't that be a good thing? Cheers Mark
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