linux-kernel - Re: [PATCH 1/3] blk-mq: allow hardware queue to get more tag while sharing a tag set

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Message-ID: <5204c625-a8f0-56c6-d10e-f40638084b97@huawei.com>
Date:   Tue, 29 Dec 2020 10:37:27 +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 2020/12/29 9:15, Ming Lei wrote:
> Just wondering why you try to set 128 via sysfs for all disks? If you do that,
> you should know the potential result given the whole tags queue depth is just
> 128.

It's just a extreme example to show the unexpected result of "always
return true from hctx_may_queue()".

Thanks,
Yu Kuai