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Message-ID: <585cded7-e38e-5f79-87dd-23a361d336b6@kernel.org>
Date:   Thu, 27 Jul 2023 09:04:20 +0900
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Subject: Re: [PATCH v4 4/7] block/null_blk: Support disabling zone write
 locking
Content-Language: en-US
To:     Bart Van Assche <bvanassche@acm.org>, Jens Axboe <axboe@kernel.dk>
Cc:     linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Ming Lei <ming.lei@redhat.com>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Johannes Thumshirn <johannes.thumshirn@wdc.com>,
        Vincent Fu <vincent.fu@samsung.com>,
        Keith Busch <kbusch@kernel.org>,
        Akinobu Mita <akinobu.mita@gmail.com>,
        Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
References: <20230726193440.1655149-1-bvanassche@acm.org>
 <20230726193440.1655149-5-bvanassche@acm.org>
From:   Damien Le Moal <dlemoal@kernel.org>
Organization: Western Digital Research
In-Reply-To: <20230726193440.1655149-5-bvanassche@acm.org>
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On 7/27/23 04:34, Bart Van Assche wrote:
> Add a new configfs attribute for disabling zone write locking. Tests
> show a performance of 250 K IOPS with no I/O scheduler, 6 K IOPS with
> mq-deadline and write locking enabled and 123 K IOPS with mq-deadline
> and write locking disabled. This shows that disabling write locking
> results in about 20 times more IOPS for this particular test case.
> 
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Damien Le Moal <dlemoal@kernel.org>
> Cc: Ming Lei <ming.lei@redhat.com>
> Signed-off-by: Bart Van Assche <bvanassche@acm.org>

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research