From: Juri Lelli <juri.lelli@redhat.com>
To: markus.stockhausen@gmx.de
Cc: peterz@infradead.org,
'Chris Packham' <Chris.Packham@alliedtelesis.co.nz>,
bjorn@mork.no, mingo@redhat.com, vincent.guittot@linaro.org,
anna-maria@linutronix.de, frederic@kernel.org,
tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: task_non_contending() for fair_server leads to timer retries
Date: Thu, 17 Jul 2025 11:05:14 +0200 [thread overview]
Message-ID: <aHi8yk8wlVJBFzSR@jlelli-thinkpadt14gen4.remote.csb> (raw)
In-Reply-To: <085d01dbf596$44286880$cc793980$@gmx.de>
Hi,
On 15/07/25 16:39, markus.stockhausen@gmx.de wrote:
> Hi Peter,
>
> I'm currently investigating issues with the timer-rtl-otto driver in
> 6.12 longterm on the Realtek MIPS switch platform (Chris is working
> hard to upstream this). While doing so I observed that timer retries
> continually increase (~6/second) according to /proc/timer_list. The
> system is otherwise totally idle. 6.6 longterm does not show that issue.
> I'm unsure if this is related but documentation reads like "that's bad".
>
> To be sure about this one I nailed it down to the fair server.
Apologies for interjecting before Peter had a chance to reply, but I had
a first look and I wonder if this recent patch from Peter (on
tip/sched/core atm) can already help with the issue, as it should
reduce the number of dl-server dequeues:
cccb45d7c4295 ("sched/deadline: Less agressive dl_server handling")
Can you please check what you see with it?
Thanks!
Juri
next prev parent reply other threads:[~2025-07-17 9:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-15 14:39 markus.stockhausen
2025-07-17 9:05 ` Juri Lelli [this message]
2025-07-17 15:05 ` Bjørn Mork
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