Date: Thu, 18 May 2006 14:02:19 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: Mike Jakubik <mikej@rogers.com> Cc: freebsd-stable@freebsd.org Subject: Re: Sequantial IO Performance improvement in 6.1-STABLE Message-ID: <446BD5AB.2070501@paradise.net.nz> In-Reply-To: <446BBDDC.5010702@rogers.com> References: <446AC35C.2090304@paradise.net.nz> <446BBC75.6040407@paradise.net.nz> <446BBDDC.5010702@rogers.com>
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Mike Jakubik wrote: > 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? > Good point, but yes - I made sure that a pre-existing file was used for the *read* test. About the *write* test - I am mistaken unfortunately, as I found some old test results showing 137Mb/s, I conclude that 140Mb/s is not significantly different from that! Cheers Mark
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