linux-kernel - Re: [PATCH v2 0/5] blk-mq-sched: support request batch dispatching for sq elevator

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Message-ID: <99e9aa7e-b33c-ce2e-bf0f-0021434690e8@huaweicloud.com>
Date: Thu, 31 Jul 2025 16:42:10 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Ming Lei <ming.lei@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc: dlemoal@...nel.org, hare@...e.de, jack@...e.cz, tj@...nel.org,
 josef@...icpanda.com, axboe@...nel.dk, cgroups@...r.kernel.org,
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com, johnny.chenyi@...wei.com,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v2 0/5] blk-mq-sched: support request batch dispatching
 for sq elevator

Hi,

在 2025/07/31 16:18, Ming Lei 写道:
> batch dispatch may hurt io merge performance which is important for
> elevator, so please provide test data on real HDD. & SSD., instead of
> null_blk only, and it can be perfect if merge sensitive workload
> is evaluated.

Ok, I'll provide test data on HDD and SSD that I have for now.

For the elevator IO merge case, what I have in mind is that we issue
small sequential IO one by one with multiple contexts, so that bios
won't be merged in plug, and this will require IO issue > IO done, is
this case enough?

Thanks,
Kuai