> On Oct 31, 2017, at 7:46 PM, Ming Lei <ming.lei@xxxxxxxxxx> wrote: > >> On Tue, Oct 31, 2017 at 02:29:32PM -0600, Jens Axboe wrote: >>> On 10/26/2017 10:43 PM, Ming Lei wrote: >>> Hi Jens, >>> >>> The 1st patch removes the RESTART for TAG-SHARED because SCSI handles it >>> by itself, and not necessary to waste CPU to do the expensive RESTART. >>> And Roman Pen reported that this RESTART cuts half of IOPS in his case. >>> >>> The 2nd patch removes the RESTART when .get_budget returns BLK_STS_RESOURCE, >>> and this RESTART is handled by SCSI's RESTART(scsi_end_request()) too. >> >> What base is this against? > > The for-next branch of your block tree: >From when? Doesn’t apply at all today.
