From: Christoph Hellwig <hch@infradead.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@fb.com>,
linux-block@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Mike Snitzer <snitzer@redhat.com>,
dm-devel@redhat.com, Bart Van Assche <bart.vanassche@sandisk.com>,
Laurence Oberman <loberman@redhat.com>,
Paolo Valente <paolo.valente@linaro.org>,
Oleksandr Natalenko <oleksandr@natalenko.name>,
Tom Nguyen <tom81094@gmail.com>,
linux-kernel@vger.kernel.org, Omar Sandoval <osandov@fb.com>
Subject: Re: [PATCH V5 8/8] blk-mq: improve bio merge from blk-mq sw queue
Date: Tue, 3 Oct 2017 02:21:43 -0700 [thread overview]
Message-ID: <20171003092143.GF2771@infradead.org> (raw)
In-Reply-To: <20170930112655.31451-9-ming.lei@redhat.com>
This looks generally good to me, but I really worry about the impact
on very high iops devices. Did you try this e.g. for random reads
from unallocated blocks on an enterprise NVMe SSD?
next prev parent reply other threads:[~2017-10-03 9:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-30 11:26 [PATCH V5 0/8] blk-mq: improve bio merge for none scheduler Ming Lei
2017-09-30 11:26 ` [PATCH V5 1/8] blk-mq-sched: introduce blk_mq_sched_queue_depth() Ming Lei
2017-09-30 11:26 ` [PATCH V5 2/8] blk-mq-sched: use q->queue_depth as hint for q->nr_requests Ming Lei
2017-09-30 11:26 ` [PATCH V5 3/8] block: introduce rqhash helpers Ming Lei
2017-10-03 9:15 ` Christoph Hellwig
2017-09-30 11:26 ` [PATCH V5 4/8] block: move actual bio merge code into __elv_merge Ming Lei
2017-10-03 9:16 ` Christoph Hellwig
2017-09-30 11:26 ` [PATCH V5 5/8] block: add check on elevator for supporting bio merge via hashtable from blk-mq sw queue Ming Lei
2017-10-03 9:17 ` Christoph Hellwig
2017-09-30 11:26 ` [PATCH V5 6/8] block: introduce .last_merge and .hash to blk_mq_ctx Ming Lei
2017-10-03 9:19 ` Christoph Hellwig
2017-09-30 11:26 ` [PATCH V5 7/8] blk-mq-sched: refactor blk_mq_sched_try_merge() Ming Lei
2017-10-03 9:20 ` Christoph Hellwig
2017-09-30 11:26 ` [PATCH V5 8/8] blk-mq: improve bio merge from blk-mq sw queue Ming Lei
2017-10-03 9:21 ` Christoph Hellwig [this message]
2017-10-09 4:28 ` Ming Lei
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