linux-kernel - Re: [PATCH] Block SQ/MQ Request Priority

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Date:   Tue, 4 Apr 2017 15:40:27 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     adam.manzanares@....com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     hch@...radead.org, Bart.VanAssche@...disk.com
Subject: Re: [PATCH] Block SQ/MQ Request Priority

On 04/04/2017 09:25 AM, adam.manzanares@....com wrote:
> From: Adam Manzanares <adam.manzanares@....com>
> 
> In 4.10 I introduced a patch that associates the ioc priority with
> each request in the block layer. This work was done in the single queue
> block layer code. This patch unifies ioc priority to request mapping across
> the single/multi queue block layers.
> 
> I have tested this patch with the null block device driver with the following
> parameters.
> 
> null_blk queue_mode=2 irqmode=0 use_per_node_hctx=1 nr_devices=1
> 
> I have not seen a performance regression with this patch and I would appreciate
> any feedback or additional testing.
> 
> I have also verified that io priorities are passed to the device when using
> the SQ and MQ path to a SATA HDD that supports io priorities.

Applied, with an updated subject line, it didn't really describe what
the patch does. Thanks.

-- 
Jens Axboe