From: Jan Kara <jack@suse.cz>
To: Jens Axboe <axboe@kernel.dk>
Cc: <linux-block@vger.kernel.org>, Ming Lei <ming.lei@redhat.com>,
Jan Kara <jack@suse.cz>
Subject: [PATCH 0/2 v2] blk-mq: Improve performance of non-mq IO schedulers with multiple HW queues
Date: Wed, 6 Jan 2021 11:24:26 +0100 [thread overview]
Message-ID: <20210106102428.551-1-jack@suse.cz> (raw)
Hello!
This patch series aims to fix a regression we've noticed on our test grid when
support for multiple HW queues in megaraid_sas driver was added during the 5.10
cycle (103fbf8e4020 scsi: megaraid_sas: Added support for shared host tagset
for cpuhotplug). The commit was reverted in the end for other reasons but I
believe the fundamental problem still exists for any other similar setup. The
problem manifests when the storage card supports multiple hardware queues
however storage behind it is slow (single rotating disk in our case) and so
using IO scheduler such as BFQ is desirable. See the second patch for details.
Honza
next reply other threads:[~2021-01-06 10:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-06 10:24 Jan Kara [this message]
2021-01-06 10:24 ` [PATCH 1/2] Revert "blk-mq, elevator: Count requests per hctx to improve performance" Jan Kara
2021-01-06 10:24 ` [PATCH 2/2] blk-mq: Improve performance of non-mq IO schedulers with multiple HW queues Jan Kara
2021-01-07 6:19 ` Ming Lei
2021-01-07 11:18 ` Jan Kara
2021-01-07 12:06 ` Ming Lei
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