Sequantial IO Performance improvement in 6.1-STABLE

Mike Jakubik mikej at
Wed May 17 17:20:37 PDT 2006

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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