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From: Jens Axboe <axboe@kernel.dk>
To: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org, Yi Zhang <yi.zhang@redhat.com>,
	Bob Liu <bob.liu@oracle.com>
Subject: Re: [PATCH V2] blk-mq: balance mapping between present CPUs and queues
Date: Sun, 4 Aug 2019 20:43:27 -0700	[thread overview]
Message-ID: <3bf36c69-d6e0-2e5b-5d45-2e2af815a80c@kernel.dk> (raw)
In-Reply-To: <20190725094146.18560-1-ming.lei@redhat.com>

On 7/25/19 2:41 AM, Ming Lei wrote:
> Spread queues among present CPUs first, then building mapping on other
> non-present CPUs.
> 
> So we can minimize count of dead queues which are mapped by un-present
> CPUs only. Then bad IO performance can be avoided by unbalanced mapping
> between present CPUs and queues.
> 
> The similar policy has been applied on Managed IRQ affinity.

LGTM, queued up for some testing.

-- 
Jens Axboe


      parent reply	other threads:[~2019-08-05  3:43 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-25  9:41 [PATCH V2] blk-mq: balance mapping between present CPUs and queues Ming Lei
2019-07-25  9:50 ` Bob Liu
2019-08-05  0:57 ` Ming Lei
2019-08-05  3:43 ` Jens Axboe [this message]

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