linux-kernel - RE: [EXT] Re: [PATCH] nvme: Add abrupt shutdown support

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Date:   Mon, 5 Jul 2021 10:40:21 +0000
From:   "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
To:     Christoph Hellwig <hch@....de>
CC:     "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shiva.linuxworks@...il.com" <shiva.linuxworks@...il.com>
Subject: RE: [EXT] Re: [PATCH] nvme: Add abrupt shutdown support

Micron Confidential

Hi Christoph,

> 
> 
> On Mon, Jul 05, 2021 at 10:11:57AM +0000, shiva.linuxworks@...il.com wrote:
> > From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> >
> > Enabling the abrupt shutdown support. In this shutdown type host does
> > not need to send Delete I/O Submission Queue and Delete I/O Completion
> > queue commands to the device.
> 
> Why?

This is to achieve faster shutdown at the cost of data in-flight.

As per the spec Deleting Submission queues and Completion queues are not explicitly 
mentioned for performing the abrupt shutdown (CC.SHN=10b).

Thanks,
Shiva


Micron Confidential