On 10/13/2017 11:24 AM, Ming Lei wrote: > When hw queue is busy, we shouldn't take requests from > scheduler queue any more, otherwise it is difficult to do > IO merge. > > This patch fixes the awful IO performance on some > SCSI devices(lpfc, qla2xxx, ...) when mq-deadline/kyber > is used by not taking requests if hw queue is busy. This looks fine to me, but needs a much better patch title. "fix scheduler bad performance" tells you nothing. -- Jens Axboe
