linux-kernel - Re: [PATCH 1/2] nvme: set io-scheduler requirement for ZNS

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Message-ID: <CA+1E3rJg0QOX4YgwWJf8Sm=6C-un4TsRX00E31fbFFPT9LYhXg@mail.gmail.com>
Date:   Wed, 19 Aug 2020 14:56:29 +0530
From:   Kanchan Joshi <joshiiitr@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Kanchan Joshi <joshi.k@...sung.com>, Jens Axboe <axboe@...nel.dk>,
        Damien Le Moal <Damien.LeMoal@....com>, sagi@...mberg.me,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH 1/2] nvme: set io-scheduler requirement for ZNS

On Tue, Aug 18, 2020 at 12:46 PM Christoph Hellwig <hch@....de> wrote:
>
> On Tue, Aug 18, 2020 at 10:59:35AM +0530, Kanchan Joshi wrote:
> > Set elevator feature ELEVATOR_F_ZBD_SEQ_WRITE required for ZNS.
>
> No, it is not.

Are you saying MQ-Deadline (write-lock) is not needed for writes on ZNS?
I see that null-block zoned and SCSI-ZBC both set this requirement. I
wonder how it became different for NVMe.

-- 
Kanchan