linux-kernel - Re: [PATCH 1/3] LoongArch: Reduce min_delta for the arch clockevent device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241114102136.X-knc36J@linutronix.de>
Date: Thu, 14 Nov 2024 11:21:36 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>, Xuerui Wang <kernel@...0n.name>,
	loongarch@...ts.linux.dev, Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-rt-devel@...ts.linux.dev, Guo Ren <guoren@...nel.org>,
	Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] LoongArch: Reduce min_delta for the arch clockevent
 device

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@...ngson.cn>

Sebastian