Date: Wed, 17 May 2006 20:20:44 -0400 From: Mike Jakubik <mikej@rogers.com> To: Mark Kirkwood <markir@paradise.net.nz> Cc: freebsd-stable@freebsd.org Subject: Re: Sequantial IO Performance improvement in 6.1-STABLE Message-ID: <446BBDDC.5010702@rogers.com> In-Reply-To: <446BBC75.6040407@paradise.net.nz> References: <446AC35C.2090304@paradise.net.nz> <446BBC75.6040407@paradise.net.nz>
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Mark Kirkwood wrote: > Mark Kirkwood wrote: >> I recently upgraded my FreeBSD machines from 6.0R to 6.1-STABLE >> >> I noticed a pleasant surprise - improved disk IO! >> >> In 6.0R best sequential throughput I ever saw was 170 MB/s (32k block >> size reads on an 4G file). In 6.1-STABLE I'm seeing 190 Mb/s (32k >> block size reads on an 4G file). >> > > Would have been even better if I'd spelled "sequential" correctly in > the subject :-(... > > I'm also seeing sequential write speed increasing from 120Mb/s to > 140Mb/s. > > I did wonder if this increased IO throughput is what is triggering the > posts about data corruption in 6.1 - i.e. more throughput means more > heat to dissipate! Or, maybe the file was in a different location on the disk. Outer and inner tracks perform differently. Did you test with the same exact file and the same file system?
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