On Fri, 2005-07-01 at 13:26 +0530, Suparna Bhattacharya wrote:
> Has anyone else noticed major throughput regressions for random
> reads/writes with aio-stress in 2.6.12 ?
> Or have there been any other FS/IO regressions lately ?
>
> 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 :(
>
> BTW, Chris/Ben, it doesn't look like the changes to aio.c have had an impact
> (I copied those back to my 2.6.11 tree and tried the runs with no effect)
> So it is something else ...
>
> Ideas/thoughts/observations ?
>
> Regards
> Suparna
>
I'm too seeing a regression, but between 2.6.10 and 2.6.12 and using
sysbench + MySQL (with POSIX AIO). The difference is roughly 8% slower
for 2.6.12. I'm currently trying to trace it.
aio-stress shows no difference so it probably does not come from
kernel AIO.
Sébastien.
--
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Sébastien Dugué BULL/FREC:B1-247
phone: (+33) 476 29 77 70 Bullcom: 229-7770
mailto:[email protected]
Linux POSIX AIO: http://www.bullopensource.org/posix
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