From: keith.busch@intel.com (Keith Busch)
Subject: RDY bit clarification
Date: Sun, 14 Jan 2018 18:57:54 -0700 [thread overview]
Message-ID: <20180115015753.GA13580@localhost.localdomain> (raw)
In-Reply-To: <CADLzrv-QioecdwfNNfipio6iWBzsaDcHovOyAV4qGu8aLwv7Tg@mail.gmail.com>
On Sun, Jan 14, 2018@09:26:23AM +0530, muthu crazy wrote:
> Why does linux nvme target code is checking for NVME_CSTS_RDY == 1
> before submitting any IO commands to device. Is there any chance RDY
> can go down after the controller initialization. It make sense if we
> check for CFS instead of RDY.
>
> Isn't causing performance drop?
I don't think it's for situations where RDY goest down on it's own, but
for checking if a badly behaving host sends a command before respecting
the proper state transitions.
next prev parent reply other threads:[~2018-01-15 1:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-14 3:56 RDY bit clarification muthu crazy
2018-01-15 1:57 ` Keith Busch [this message]
2018-01-15 2:06 ` muthu crazy
2018-01-15 2:12 ` Keith Busch
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=20180115015753.GA13580@localhost.localdomain \
--to=keith.busch@intel.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