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. -- ------------------------------------------------------ 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 ------------------------------------------------------ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
