On Tue, Oct 31, 2017 at 07:53:03PM -0600, Jens Axboe wrote: > > > 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. I just tried today's for-next(top commit is 'MAINTAINERS: Remove Rafael from Opal maintainers.'), and the two patches can be applied cleanly. I guess you may try to apply the two patches against for-4.15/block, which doesn't include the patchset of '[PATCH V10 0/8] blk-mq-sched: improve sequential I/O'[1]: https://marc.info/?t=150797316600002&r=1&w=2 -- Ming
