On Tue, Feb 27, 2007 at 12:29:08PM +0100, Jens Axboe ([EMAIL PROTECTED]) wrote: > On Tue, Feb 27 2007, Evgeniy Polyakov wrote: > > My two coins: > > # cat job > > [global] > > bs=8k > > size=1g > > direct=0 > > ioengine=sync > > iodepth=32 > > rw=read > > > > [file] > > filename=/home/user/test > > > > sync: > > READ: io=1,024MiB, aggrb=39,329KiB/s, minb=39,329KiB/s, > > maxb=39,329KiB/s, mint=27301msec, maxt=27301msec > > > > libaio: > > READ: io=1,024MiB, aggrb=39,435KiB/s, minb=39,435KiB/s, > > maxb=39,435KiB/s, mint=27228msec, maxt=27228msec > > > > syslet-rw: > > READ: io=1,024MiB, aggrb=29,567KiB/s, minb=29,567KiB/s, > > maxb=29,567KiB/s, mint=36315msec, maxt=36315msec > > > > During syslet-rw test about 9500 async schduledes happend. > > I use fio-git-20070226150114.tar.gz > > That looks pretty pathetic :-). What IO scheduler did you use? syslets > will confuse CFQ currently, so you want to compare with using eg > deadline or as. That is one of the downsides of this approach.
Deadline shows this: sync: READ: io=1,024MiB, aggrb=38,212KiB/s, minb=38,212KiB/s, maxb=38,212KiB/s, mint=28099msec, maxt=28099msec libaio: READ: io=1,024MiB, aggrb=37,933KiB/s, minb=37,933KiB/s, maxb=37,933KiB/s, mint=28306msec, maxt=28306msec syslet-rw: READ: io=1,024MiB, aggrb=34,759KiB/s, minb=34,759KiB/s, maxb=34,759KiB/s, mint=30891msec, maxt=30891msec There were about 10k async schedulings. -- Evgeniy Polyakov - 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/