From: Roman Mamedov <rm@romanrm.net>
To: Jonmichael Hands <jm@chia.net>
Cc: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>,
Logan Gunthorpe <logang@deltatee.com>,
linux-raid@vger.kernel.org, Jes Sorensen <jes@trained-monkey.org>,
Guoqing Jiang <guoqing.jiang@linux.dev>, Xiao Ni <xni@redhat.com>,
Coly Li <colyli@suse.de>,
Chaitanya Kulkarni <chaitanyak@nvidia.com>,
Stephen Bates <sbates@raithlin.com>,
Martin Oliveira <Martin.Oliveira@eideticom.com>,
David Sloan <David.Sloan@eideticom.com>
Subject: Re: [PATCH mdadm v2 1/2] mdadm: Add --discard option for Create
Date: Fri, 9 Sep 2022 20:31:30 +0500 [thread overview]
Message-ID: <20220909203130.71be302a@nvm> (raw)
In-Reply-To: <CABdXBANrJNWjq4237k9DPRoxLVmiAUoKMZxaaLUrcMHsODwvmA@mail.gmail.com>
On Fri, 9 Sep 2022 07:40:00 -0700
Jonmichael Hands <jm@chia.net> wrote:
> Deterministic read zero after TRIM is standardized and can be reported by
> device. If the device supports these bits, they will always return zero
> after discard.
Point is that some/many devices do not report this capability properly, but
actually do read back zeroes after TRIM. Relying on the reporting alone would
exclude a lot of cases where the optimization could have been used. So it is
useful to verify the observed behavior and still allow the optimization in
those cases.
--
With respect,
Roman
next prev parent reply other threads:[~2022-09-09 15:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 23:08 [PATCH mdadm v2 0/2] Discard Option for Creating Arrays Logan Gunthorpe
2022-09-08 23:08 ` [PATCH mdadm v2 1/2] mdadm: Add --discard option for Create Logan Gunthorpe
2022-09-09 9:57 ` Mariusz Tkaczyk
2022-09-09 11:54 ` Roman Mamedov
[not found] ` <CABdXBANrJNWjq4237k9DPRoxLVmiAUoKMZxaaLUrcMHsODwvmA@mail.gmail.com>
2022-09-09 15:31 ` Roman Mamedov [this message]
2022-09-12 17:43 ` Martin K. Petersen
2022-09-09 15:47 ` Logan Gunthorpe
2022-09-13 7:35 ` Mariusz Tkaczyk
2022-09-13 15:43 ` Logan Gunthorpe
2022-09-14 12:01 ` Mariusz Tkaczyk
2022-09-14 16:29 ` Logan Gunthorpe
2022-09-14 17:39 ` Mariusz Tkaczyk
2022-09-19 8:41 ` Xiao Ni
2022-09-21 18:45 ` Logan Gunthorpe
2022-09-08 23:08 ` [PATCH mdadm v2 2/2] manpage: Add --discard option to manpage Logan Gunthorpe
2022-09-12 17:40 ` [PATCH mdadm v2 0/2] Discard Option for Creating Arrays Martin K. Petersen
[not found] ` <CABdXBAP0LeQMmhSLUMZ_TmnSp5xmZ4xJBkNa7HUm7094m_x9xA@mail.gmail.com>
2022-09-13 3:47 ` Martin K. Petersen
2022-09-13 15:38 ` Logan Gunthorpe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220909203130.71be302a@nvm \
--to=rm@romanrm.net \
--cc=David.Sloan@eideticom.com \
--cc=Martin.Oliveira@eideticom.com \
--cc=chaitanyak@nvidia.com \
--cc=colyli@suse.de \
--cc=guoqing.jiang@linux.dev \
--cc=jes@trained-monkey.org \
--cc=jm@chia.net \
--cc=linux-raid@vger.kernel.org \
--cc=logang@deltatee.com \
--cc=mariusz.tkaczyk@linux.intel.com \
--cc=sbates@raithlin.com \
--cc=xni@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox