linux-kernel - Re: 10x I/O await times in 6.12

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Message-ID: <CAGis_TW2QqbMW9dW1q4ZwBtoZd=R0rxzcCrzBMDgOjdw-5HmRQ@mail.gmail.com>
Date: Thu, 1 May 2025 10:52:30 +0100
From: Matt Fleming <mfleming@...udflare.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kernel-team <kernel-team@...udflare.com>, 
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: 10x I/O await times in 6.12

On Thu, 24 Apr 2025 at 03:35, Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> Thanks for the test.
>
> Do you have any suggestions? For now, I can think of two different
> fixes:
>
> 1) clear time for the preempt case. On the one hand, preempt can be
> frequent, cauing performance degradation; On the other hand, this can't
> solve all the problems, for example, lots of interrupt or lots of BIO
> issued into one round of plug.
>
> 2) delay setting rq start time to flush plug, however, the latency value
> is still not accurate, and will be slightly smaller instead of greater.

Hi Kuai and Jens, is there any news here?

Thanks,
Matt