From: Punit Agrawal <punitagrawal@gmail.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Clark Williams <williams@redhat.com>,
John Kacur <jkacur@redhat.com>,
Pierre FICHEUX <pierre.ficheux@smile.fr>,
linux-rt-users@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Strange problem with PREEMPT_RT
Date: Fri, 01 Oct 2021 08:01:17 +0900 [thread overview]
Message-ID: <87h7e14qiq.fsf@stealth> (raw)
In-Reply-To: <20210930132319.eixnv6rb66ui6x6j@linutronix.de> (Sebastian Andrzej Siewior's message of "Thu, 30 Sep 2021 15:23:19 +0200")
Sebastian Andrzej Siewior <bigeasy@linutronix.de> writes:
> On 2021-09-30 09:13:25 [+0900], Punit Agrawal wrote:
>> With hackbench, the system is sufficiently busy to avoid the going into
>> idle.
>
> Not just that. cyclictest's usage of /dev/cpu_dma_latency has the side
> effect that it may disable some of the PM stuff in the system.
> So your system appears good but then when cyclictest is gone, the
> numbers go up.
>
> Maybe we should drop that so we observe a system without altering its
> behaviour?
+1
For users tuning their system it doesn't help if the reported numbers
are not reproducible when running their application.
prev parent reply other threads:[~2021-09-30 23:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 16:40 Strange problem with PREEMPT_RT Pierre FICHEUX
2021-09-30 0:13 ` Punit Agrawal
2021-09-30 8:21 ` Pierre FICHEUX
2021-09-30 13:17 ` Luis Goncalves
2021-09-30 13:18 ` Sebastian Andrzej Siewior
2021-09-30 13:23 ` Sebastian Andrzej Siewior
2021-09-30 13:26 ` Pierre FICHEUX
2021-09-30 13:51 ` Sebastian Andrzej Siewior
2021-09-30 14:31 ` Pierre FICHEUX
2021-09-30 23:40 ` Punit Agrawal
2021-10-03 11:11 ` Jack Winch
2021-10-04 12:54 ` John Kacur
2021-10-18 9:12 ` Sebastian Andrzej Siewior
2021-09-30 13:41 ` John Ogness
2021-09-30 14:25 ` John Kacur
2021-09-30 15:02 ` John Ogness
2021-09-30 15:49 ` Sebastian Andrzej Siewior
2021-09-30 16:16 ` John Kacur
2021-09-30 23:22 ` Punit Agrawal
2021-09-30 14:59 ` John Kacur
2021-09-30 23:01 ` Punit Agrawal [this message]
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