>> I also noticed that I/O barriers were introduced in v2.6.16 and
>> thought they may be the cause, but mounting the file system with
>> 'nobarrier' doesn't seem to affect the performance in any way.
>
>
> did this happen to be a remount with nobarrier, or a fresh mount?
For the barrier stuff, see
http://lkml.org/lkml/2006/5/19/33
-`J'
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