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

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Message-ID: <38482b1b-b1c7-bb41-b086-6ce00f6a9d1d@grimberg.me>
Date:   Tue, 23 Jun 2020 10:39:01 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Keith Busch <kbusch@...nel.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     axboe@...com, hch@....de, baolin.wang7@...il.com,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] nvme: Add Arbitration Burst support


>>  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.

Where do we do priority class arbitration? no one sets it