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SubjectRe: aio-stress throughput regressions from 2.6.11 to 2.6.12
On Fri, Jul 01, 2005 at 10:25:55AM -0400, Benjamin LaHaise wrote:
> On Fri, Jul 01, 2005 at 01:26:00PM +0530, Suparna Bhattacharya wrote:
> > On one test system I see a degradation from around 17+ MB/s to 11MB/s
> > for random O_DIRECT AIO (aio-stress -o3 testext3/rwfile5) from 2.6.11
> > to 2.6.12. It doesn't seem filesystem specific. Not good :(
> What sort of io subsystem does it have? Also, does changing the

> elevator make any difference? I'm away for the long weekend, but will

I tried switching to the noop elevator - the regression was still there.

> help look into this next week.

Do you see the regression as well, or is it just me ?


> -ben

Suparna Bhattacharya (
Linux Technology Center
IBM Software Lab, India

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