Re: [PATCH V2 0/2] block: remove unnecessary RESTART
From: Jens Axboe <axboe@kernel.dk>
Date: 2017-10-31 20:29:32
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? -- Jens Axboe