From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Huacai Chen <chenhuacai@kernel.org>
Cc: Huacai Chen <chenhuacai@loongson.cn>,
Xuerui Wang <kernel@xen0n.name>,
loongarch@lists.linux.dev, Clark Williams <clrkwllms@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-rt-devel@lists.linux.dev, Guo Ren <guoren@kernel.org>,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] LoongArch: Allow to enable PREEMPT_RT
Date: Thu, 14 Nov 2024 12:14:09 +0100 [thread overview]
Message-ID: <20241114111409.LWKp5YEg@linutronix.de> (raw)
In-Reply-To: <CAAhV-H72YSNBGutYPOVi=S7nwLb6YOiQOFqnimAp=9D0wAJc3g@mail.gmail.com>
On 2024-11-14 19:07:37 [+0800], Huacai Chen wrote:
> Hi, Sebastian,
Hi,
> > Why is ntpd/chronyd service affecting this? Is it running at prio 99?
> > Otherwise it should not be noticed.
> No, ntpd/chronyd doesn't affect latency. But they may trigger RTC
> synchronization every 11 minutes, and RTC synchronization affects
> latency. We can keep ntpd/chronyd running but disable RTC
> synchronization by configuration, this is the least aggressive method.
What is "RTC synchronization" in this context?
> > Is lockdep complaining in any workloads?
> > Is CONFIG_DEBUG_ATOMIC_SLEEP leading to any complains?
> This needs more tests because I haven't enabled them.
That would be good. It would show if there is anything that has not yet
been noticed.
> Huacai
Sebastian
next prev parent reply other threads:[~2024-11-14 11:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-08 9:15 [PATCH 0/3] LoongArch: Add PREEMPT_RT support Huacai Chen
2024-11-08 9:15 ` [PATCH 1/3] LoongArch: Reduce min_delta for the arch clockevent device Huacai Chen
2024-11-14 10:21 ` Sebastian Andrzej Siewior
2024-11-14 11:46 ` Huacai Chen
2024-11-14 13:27 ` Sebastian Andrzej Siewior
2024-11-15 6:44 ` Huacai Chen
2024-11-08 9:15 ` [PATCH 2/3] LoongArch: Select HAVE_POSIX_CPU_TIMERS_TASK_WORK Huacai Chen
2024-11-08 9:15 ` [PATCH 3/3] LoongArch: Allow to enable PREEMPT_RT Huacai Chen
2024-11-08 15:05 ` Steven Rostedt
2024-11-14 10:31 ` Sebastian Andrzej Siewior
2024-11-14 11:07 ` Huacai Chen
2024-11-14 11:14 ` Sebastian Andrzej Siewior [this message]
2024-11-14 11:19 ` Huacai Chen
2024-11-14 11:30 ` Sebastian Andrzej Siewior
2024-11-14 11:36 ` Huacai Chen
2024-11-14 13:29 ` Sebastian Andrzej Siewior
2024-11-14 14:43 ` Clark Williams
2024-11-18 7:36 ` Sebastian Andrzej Siewior
[not found] ` <CAPAFJkp_MQ8rNsTTY3xfYMhdtiWQunN65Yfft1SqZLptG2J5cw@mail.gmail.com>
2024-11-20 7:36 ` Sebastian Andrzej Siewior
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