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authorJeff Moyer <jmoyer@redhat.com>2009-10-02 18:57:36 -0400
committerJens Axboe <jens.axboe@oracle.com>2009-10-28 09:29:25 +0100
commitcfb1e33eed48165763edc7a4a067cf5f74898d0b (patch)
treed0e0bdd0664615b1f7be6cf770476e16dbcad116 /drivers/block/drbd
parent1af60fbd759d31f565552fea315c2033947cfbe6 (diff)
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>
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