linux-kernel - Re: Question with maxcpus= parameter.

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Message-ID: <CAE9FiQUEsJgqhx=SZm4Bt3c_9_fM8LPgmmSQzS51hrZEsNpKGg@mail.gmail.com>
Date:	Sun, 8 Nov 2015 22:12:03 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Zhenzhong Duan <zhenzhong.duan@...cle.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ashok Raj <ashok.raj@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Feng Jin <joe.jin@...cle.com>
Subject: Re: Question with maxcpus= parameter.

On Sun, Nov 8, 2015 at 9:47 PM, Zhenzhong Duan
<zhenzhong.duan@...cle.com> wrote:
> Tried nr_cpus=4, works.
>

nr_cpus and maxcpus are different.

maxcpus=4 means kernel will only bring up 4 cpus, but other cpus still
can be brought up online.
if there are more cpu are there according acpi MADT.

nr_cpus=4 that means 4 is hard limit, just like you compiled kernel
with CONFIG_NR_CPUS=4.

Yinghai
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