linux-kernel - Re: [PATCH v8 05/11] null_blk: allow non power of 2 zoned devices

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Message-ID: <a2b40d05-5f1d-0e56-b530-ce6d61be7b8a@samsung.com>
Date:   Fri, 29 Jul 2022 09:51:54 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     Chaitanya Kulkarni <chaitanyak@...dia.com>
CC:     "snitzer@...nel.org" <snitzer@...nel.org>,
        "matias.bjorling@....com" <matias.bjorling@....com>,
        "Johannes.Thumshirn@....com" <Johannes.Thumshirn@....com>,
        "gost.dev@...sung.com" <gost.dev@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hare@...e.de" <hare@...e.de>, "hch@....de" <hch@....de>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "pankydev8@...il.com" <pankydev8@...il.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "Luis Chamberlain" <mcgrof@...nel.org>
Subject: Re: [PATCH v8 05/11] null_blk: allow non power of 2 zoned devices

On 2022-07-27 23:59, Chaitanya Kulkarni wrote:
>> Sequential Write:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> |     IOdepth     |            8                    |            16                   |
>> x-----------------x---------------------------------x---------------------------------x
>> |                 |  KIOPS   |BW(MiB/s) | Lat(usec) |  KIOPS   |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch   |  578     |  2257    |   12.80   |  576     |  2248    |   25.78   |
>> x-----------------x---------------------------------x---------------------------------x
>> |  With patch     |  581     |  2268    |   12.74   |  576     |  2248    |   25.85   |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Sequential read:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> | IOdepth         |            8                    |            16                   |
>> x-----------------x---------------------------------x---------------------------------x
>> |                 |  KIOPS   |BW(MiB/s) | Lat(usec) |  KIOPS   |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch   |  667     |  2605    |   11.79   |  675     |  2637    |   23.49   |
>> x-----------------x---------------------------------x---------------------------------x
>> |  With patch     |  667     |  2605    |   11.79   |  675     |  2638    |   23.48   |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Random read:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> | IOdepth         |            8                    |            16                   |
>> x-----------------x---------------------------------x---------------------------------x
>> |                 |  KIOPS   |BW(MiB/s) | Lat(usec) |  KIOPS   |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch   |  522     |  2038    |   15.05   |  514     |  2006    |   30.87   |
>> x-----------------x---------------------------------x---------------------------------x
>> |  With patch     |  522     |  2039    |   15.04   |  523     |  2042    |   30.33   |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Minor variations are noticed in Sequential write with io depth 8 and
>> in random read with io depth 16. But overall no noticeable differences
>> were noticed
> 
> minor variations in with aspect of the performance ?
> are these documented somewhere ?
> 
The table above documents those minor variations in performance.
> move the large table of performance numbers to the cover letter it looks 
> ugly in the git log...
> 
I could do that.
>