linux-kernel - Re: [PATCH V5 8/8] blk-mq: improve bio merge from blk-mq sw queue

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Message-ID: <20171003092143.GF2771@infradead.org>
Date:   Tue, 3 Oct 2017 02:21:43 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Laurence Oberman <loberman@...hat.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Tom Nguyen <tom81094@...il.com>, linux-kernel@...r.kernel.org,
        Omar Sandoval <osandov@...com>
Subject: Re: [PATCH V5 8/8] blk-mq: improve bio merge from blk-mq sw queue

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?