linux-kernel - Re: [PATCH RFC 1/3] block/mq-deadline: Revert "block/mq-deadline: Fix the tag reservation code"

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Message-ID: <8a0a5ae2-b4f4-75ee-483e-205fb80efeb4@huaweicloud.com>
Date: Wed, 11 Dec 2024 11:00:30 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Bart Van Assche <bvanassche@....org>, Yu Kuai <yukuai1@...weicloud.com>,
 axboe@...nel.dk, akpm@...ux-foundation.org, yang.yang@...o.com,
 ming.lei@...hat.com, osandov@...com, paolo.valente@...aro.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC 1/3] block/mq-deadline: Revert "block/mq-deadline: Fix
 the tag reservation code"

Hi,

在 2024/12/11 4:33, Bart Van Assche 写道:
> How much does this affect performance? If this affects performance
> significantly I agree that this needs to be fixed.

We are testing megaraid-sas, with 24 jobs * 1024 iodepth, for randread
and randrw tests, v5.10 is about 20% better than v6.6.

I verified that just set wake_batch from 1 back to 8 can fix this.

Thanks,
Kuai