From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Huacai Chen <chenhuacai@loongson.cn>
Cc: Huacai Chen <chenhuacai@kernel.org>,
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 1/3] LoongArch: Reduce min_delta for the arch clockevent device
Date: Thu, 14 Nov 2024 11:21:36 +0100 [thread overview]
Message-ID: <20241114102136.X-knc36J@linutronix.de> (raw)
In-Reply-To: <20241108091545.4182229-2-chenhuacai@loongson.cn>
On 2024-11-08 17:15:43 [+0800], Huacai Chen wrote:
> Now the min_delta is 0x600 (1536) for LoongArch's constant clockevent
> device. For a 100MHz hardware timer this means ~15us. This is a little
> big, especially for PREEMPT_RT enabled kernels. So reduce it to 1000
> (we don't want too small values to affect performance).
So this reduces it to 10us. Is anything lower than that bad performance
wise?
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Sebastian
next prev parent reply other threads:[~2024-11-14 10:21 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 [this message]
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
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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