From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Daniel Wagner <wagi@monom.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [ANNOUNCE] v5.10-rc2-rt4
Date: Thu, 12 Nov 2020 14:54:46 +0100 [thread overview]
Message-ID: <20201112135446.ghwvgio6f66igcho@linutronix.de> (raw)
In-Reply-To: <20201112123902.netkfwzccwrtscdv@beryllium.lan>
On 2020-11-12 13:39:02 [+0100], Daniel Wagner wrote:
> With the current version signaltest + your test patch and 'taskset -c1'
> the results looks good again, around 230us (running since 2 hours). I've
> tested first without taskset and it took about an half hour to hit
> 350us. So pinning the threads on one CPU fixes it.
okay. So case closed.
> I think we change signaltest to use the correct affinity on
> default. Also, I see that sigwaittest has some code for it, but it, but
> it would be a good idea to set the defaults so that out of the box the
> test does the right thing.
Sounds reasonable. Having tasks jumping from one CPU to another may lead
to higher latencies.
> I'm sorry about dragging you into this problem.
I feared that something in lazy preempt or signal stack is broken. But
it appears not to be the case :)
Sebastian
prev parent reply other threads:[~2020-11-12 13:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 19:57 Sebastian Andrzej Siewior
2020-11-04 10:38 ` Daniel Wagner
2020-11-04 10:46 ` Sebastian Andrzej Siewior
2020-11-04 11:19 ` Daniel Wagner
2020-11-04 12:47 ` Daniel Wagner
2020-11-04 13:09 ` Sebastian Andrzej Siewior
2020-11-04 16:06 ` Daniel Wagner
2020-11-06 10:54 ` Sebastian Andrzej Siewior
2020-11-06 16:14 ` Daniel Wagner
2020-11-09 12:47 ` Sebastian Andrzej Siewior
2020-11-09 14:37 ` Daniel Wagner
2020-11-09 16:31 ` Sebastian Andrzej Siewior
2020-11-11 18:39 ` Daniel Wagner
2020-11-10 18:05 ` Sebastian Andrzej Siewior
2020-11-12 12:39 ` Daniel Wagner
2020-11-12 13:54 ` Sebastian Andrzej Siewior [this message]
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