From: Christoph Hellwig <hch@lst.de>
To: Javier Gonzalez <javier@javigon.com>
Cc: axboe@kernel.dk, Damien.LeMoal@wdc.com,
SelvaKumar S <selvakuma.s1@samsung.com>,
sagi@grimberg.me, Kanchan Joshi <joshi.k@samsung.com>,
johannes.thumshirn@wdc.com, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org,
Nitesh Shetty <nj.shetty@samsung.com>,
kbusch@kernel.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 2/2] nvme: add emulation for zone-append
Date: Wed, 19 Aug 2020 12:49:15 +0200 [thread overview]
Message-ID: <20200819104915.GA3153@lst.de> (raw)
In-Reply-To: <20200819083353.rwblagiesocfcq7i@mpHalley.local>
On Wed, Aug 19, 2020 at 10:33:53AM +0200, Javier Gonzalez wrote:
> I would ask you to reconsider this position. I have a hard time
> understanding how zone append emulation is a good idea in SCSI and not
> in NVMe, when there is no performance penalty.
Per the numbers on btrfs and zonefs numbers zone append emulation is
faster than using serialized writes, but also way slower than native
zone append. Zone append emulation for SCSI is the way to bring
support for pre-existing standards into the brave new world. Not
requiring Zone Append in a standard designed around it because of
bowing down to last minute political interventions in the standards
committee is shooting ourselves in the foot.
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next prev parent reply other threads:[~2020-08-19 10:49 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200818053247epcas5p262c5fd7e207dfa5145011c4329cf239d@epcas5p2.samsung.com>
2020-08-18 5:29 ` [PATCH 0/2] enable append-emulation for ZNS Kanchan Joshi
2020-08-18 5:29 ` [PATCH 1/2] nvme: set io-scheduler requirement " Kanchan Joshi
2020-08-18 7:11 ` Christoph Hellwig
2020-08-19 9:26 ` Kanchan Joshi
2020-08-19 9:38 ` Damien Le Moal
2020-08-19 10:31 ` Kanchan Joshi
2020-08-19 11:17 ` Damien Le Moal
2020-09-07 7:00 ` Kanchan Joshi
2020-09-07 8:22 ` Damien Le Moal
2020-09-07 11:23 ` Kanchan Joshi
2020-09-07 11:37 ` Damien Le Moal
2020-09-07 11:54 ` Kanchan Joshi
2020-09-07 12:53 ` Damien Le Moal
2020-08-18 5:29 ` [PATCH 2/2] nvme: add emulation for zone-append Kanchan Joshi
2020-08-18 7:12 ` Christoph Hellwig
2020-08-18 9:50 ` Javier Gonzalez
2020-08-18 10:51 ` Matias Bjørling
2020-08-18 18:11 ` Javier Gonzalez
2020-08-18 15:50 ` Christoph Hellwig
2020-08-18 18:04 ` Javier Gonzalez
2020-08-19 7:40 ` Christoph Hellwig
2020-08-19 8:33 ` Javier Gonzalez
2020-08-19 9:14 ` Damien Le Moal
2020-08-19 10:43 ` Christoph Hellwig
2020-08-20 6:45 ` Javier Gonzalez
2020-08-19 10:49 ` Christoph Hellwig [this message]
2020-08-18 16:58 ` Keith Busch
2020-08-18 17:29 ` Javier Gonzalez
2020-08-18 17:39 ` Keith Busch
2020-08-18 18:13 ` Javier Gonzalez
2020-08-19 19:11 ` David Fugate
2020-08-19 19:25 ` Jens Axboe
2020-08-19 21:54 ` David Fugate
2020-08-19 22:10 ` Keith Busch
2020-08-19 23:43 ` David Fugate
2020-08-20 3:45 ` Keith Busch
2020-08-20 23:26 ` David Fugate
2020-08-20 5:51 ` Christoph Hellwig
2020-08-20 6:37 ` Javier Gonzalez
2020-08-20 6:52 ` Christoph Hellwig
2020-08-20 8:03 ` Javier Gonzalez
2020-08-19 21:42 ` Keith Busch
2020-08-20 7:37 ` Kanchan Joshi
2020-08-20 8:14 ` Javier Gonzalez
2020-08-20 5:29 ` Christoph Hellwig
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