linux-kernel - [PATCH 0/2] block/SCSI MQ: two RESTART related patches

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Date:   Tue, 17 Oct 2017 13:04:16 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>
Cc:     Bart Van Assche <bart.vanassche@...disk.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Omar Sandoval <osandov@...com>,
        John Garry <john.garry@...wei.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH 0/2] block/SCSI MQ: two RESTART related patches

Hi Jens,

The 1st patch runs idle hctx after dealy in scsi_mq_get_budget(),
so that we can keep same behaviour with before, and it can be
thought as a fix.

The 2nd patch cleans up RESTART, and removes handling for TAG_SHARED
from current blk-mq's RESTART mechanism because SCSI_MQ can covers its
restart by itself, so that no need to handle TAG_SHARED in blk-mq
RESTART. And >20% IOPS boost is observed in my rand read test over
scsi_debug.

John, please test this two patches and see if it may improve your SAS
IO performance, and you can find the two patches in the following branch:

	https://github.com/ming1/linux/commits/blk_mq_improve_restart_V1

Ming Lei (2):
  SCSI: run idle hctx after delay in scsi_mq_get_budget()
  blk-mq: don't handle TAG_SHARED in restart

 block/blk-mq-sched.c    | 78 +++----------------------------------------------
 drivers/scsi/scsi_lib.c | 13 +++++++--
 2 files changed, 14 insertions(+), 77 deletions(-)

-- 
2.9.5