linux-kernel - Re: [PATCH 1/3] nvme: Add Arbitration Burst support

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Message-ID: <20200623144014.GB1288900@dhcp-10-100-145-180.wdl.wdc.com>
Date:   Tue, 23 Jun 2020 07:40:14 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me, baolin.wang7@...il.com,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] nvme: Add Arbitration Burst support

On Tue, Jun 23, 2020 at 09:24:32PM +0800, Baolin Wang wrote:
> From the NVMe spec, "In order to make efficient use of the non-volatile
> memory, it is often advantageous to execute multiple commands from a
> Submission Queue in parallel. For Submission Queues that are using
> weighted round robin with urgent priority class or round robin
> arbitration, host software may configure an Arbitration Burst setting".
> Thus add Arbitration Burst setting support.

But if the user changed it to something else that better matches how
they want to use queues, the driver is just going to undo that setting
on the next reset.