From: "yukuai (C)" <yukuai3@huawei.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: <axboe@kernel.dk>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <yi.zhang@huawei.com>,
<zhangxiaoxu5@huawei.com>
Subject: Re: [PATCH 1/3] blk-mq: allow hardware queue to get more tag while sharing a tag set
Date: Tue, 29 Dec 2020 10:37:27 +0800 [thread overview]
Message-ID: <5204c625-a8f0-56c6-d10e-f40638084b97@huawei.com> (raw)
In-Reply-To: <20201229011517.GA3355551@T590>
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
next prev parent reply other threads:[~2020-12-29 2:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-26 10:28 [PATCH 0/3] fix the performance fluctuation due to shared tagset Yu Kuai
2020-12-26 10:28 ` [PATCH 1/3] blk-mq: allow hardware queue to get more tag while sharing a tag set Yu Kuai
2020-12-27 11:58 ` Ming Lei
2020-12-28 1:56 ` yukuai (C)
2020-12-28 8:28 ` Ming Lei
2020-12-28 9:02 ` yukuai (C)
2020-12-29 1:15 ` Ming Lei
2020-12-29 2:37 ` yukuai (C) [this message]
2020-12-26 10:28 ` [PATCH 2/3] blk-mq: clear 'active_queues' immediately when 'nr_active' is decreased to 0 Yu Kuai
2020-12-26 10:28 ` [PATCH 3/3] blk-mq: decrease pending_queues when it expires Yu Kuai
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