Sequantial IO Performance improvement in 6.1-STABLE
markir at paradise.net.nz
Wed May 17 19:02:48 PDT 2006
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
>> 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!
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