From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [PATCH] Block SQ/MQ Request Priority To: adam.manzanares@wdc.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org References: <1491319514-6671-1-git-send-email-adam.manzanares@wdc.com> Cc: hch@infradead.org, Bart.VanAssche@sandisk.com From: Jens Axboe Message-ID: <0ee226a2-0be5-0832-e92d-785ee8a480e1@kernel.dk> Date: Tue, 4 Apr 2017 15:40:27 -0600 MIME-Version: 1.0 In-Reply-To: <1491319514-6671-1-git-send-email-adam.manzanares@wdc.com> Content-Type: text/plain; charset=windows-1252 List-ID: On 04/04/2017 09:25 AM, adam.manzanares@wdc.com wrote: > From: Adam Manzanares > > 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