Re: [PATCH V5 2/7] blk-mq-sched: fix scheduler bad performance

2017-10-02 Thread Christoph Hellwig
Looks fine, Reviewed-by: Christoph Hellwig

[PATCH V5 2/7] blk-mq-sched: fix scheduler bad performance

2017-09-30 Thread Ming Lei
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. Tested-by: Oleks