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SubjectRe: ext4 performance regression 2.6.27-stable versus 2.6.32 and later
On Mon, 02 Aug 2010, Kay Diederichs wrote:
> Performance-wise, we tried mounting with barrier versus nobarrier (or
> barrier=1 versus barrier=0) and re-did the 2.6.32+ benchmarks. It turned
> out that the benchmark difference with and without barrier is less than
> the variation between runs (which is much higher with 2.6.32+ than with
> 2.6.27-stable), so the influence seems to be minor.

Did you check interactions with the IO scheduler?

"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh

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