tree d0e0bdd0664615b1f7be6cf770476e16dbcad116
parent 1af60fbd759d31f565552fea315c2033947cfbe6
author Jeff Moyer <jmoyer@redhat.com> 1254524256 -0400
committer Jens Axboe <jens.axboe@oracle.com> 1256718565 +0100

aio: implement request batching

Hi,

Some workloads issue batches of small I/O, and the performance is poor
due to the call to blk_run_address_space for every single iocb.  Nathan
Roberts pointed this out, and suggested that by deferring this call
until all I/Os in the iocb array are submitted to the block layer, we
can realize some impressive performance gains (up to 30% for sequential
4k reads in batches of 16).

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>