Re: [PATCH V8 1/7] blk-mq-sched: fix scheduler bad performance

[Jens Axboe]

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