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Date: Wed, 17 May 2006 20:20:44 -0400
From: Mike Jakubik <mikej@rogers.com>
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To: Mark Kirkwood <markir@paradise.net.nz>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Sequantial IO Performance improvement in 6.1-STABLE
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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?