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From: Juri Lelli <juri.lelli@redhat.com>
To: Andreas Ziegler <br025@umbiko.net>
Cc: Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: sched/deadline: Use revised wakeup rule for dl_server
Date: Mon, 11 May 2026 14:46:51 +0200	[thread overview]
Message-ID: <agHPu0WAv46ICYV3@jlelli-thinkpadt14gen4.remote.csb> (raw)
In-Reply-To: <496e4b3329fe258da9618b9f05b18fcf@umbiko.net>

Hello,

On 08/05/26 08:09, Andreas Ziegler wrote:
> Linux kernel version: 6.12
>   CONFIG_PREEMPT_RT (w/ PREEMPT_RT patch applied)
> Architecture: aarch64
> Platform: Raspberry Pi 4
> 
> Hi everyone,
> 
> Commit d66792919d4f (sched/deadline: Use revised wakeup rule for dl_server)
> [1] introduced a marked degradation in scheduling latency for real-time
> tasks in the presence of heavy I/O load.

Can this be the same regression reported here?

https://marc.info/?l=linux-rt-users&m=177844667227991

Please notice the list of missing subsequent fixes Mike is suggesting to
test with.

https://marc.info/?l=linux-rt-users&m=177847863710263&w=2

Thanks,
Juri


  parent reply	other threads:[~2026-05-11 12:46 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-08  8:09 sched/deadline: Use revised wakeup rule for dl_server Andreas Ziegler
2026-05-08  9:20 ` Christian Loehle
2026-05-08 12:06   ` Andreas Ziegler
2026-05-08 14:13     ` Christian Loehle
2026-05-09 11:42       ` Andreas Ziegler
2026-05-11  9:47         ` Christian Loehle
2026-05-11 12:37           ` Andreas Ziegler
2026-05-11 12:46 ` Juri Lelli [this message]
2026-05-11 14:13   ` Andreas Ziegler

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