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Date: Mon, 28 Dec 2020 17:02:50 +0800 From: "yukuai (C)" <yukuai3@...wei.com> To: Ming Lei <ming.lei@...hat.com> CC: <axboe@...nel.dk>, <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>, <zhangxiaoxu5@...wei.com> Subject: Re: [PATCH 1/3] blk-mq: allow hardware queue to get more tag while sharing a tag set Hi On 2020/12/28 16:28, Ming Lei wrote: > Another candidate solution may be to always return true from hctx_may_queue() > for this kind of queue because queue_depth has provided fair allocation for > each LUN, and looks not necessary to do that again. If always return true from hctx_may_queue() in this case, for example, we set queue_depth to 128(if can't, the biggger, the better) for all disks, and test with numjobs=64. The result should be one disk with high iops, and the rest very low. So I think it's better to ensure the max tags a disk can get in this case. Thanks! Yu Kuai
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