Date: Tue, 7 Apr 2009 13:48:49 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: =?ISO-2022-JP?Q?=1B$BVC4d=1B=28Jccuiyyan=40sina=2Ecom?= <ccuiyyan@gmail.com> Cc: freebsd-current@freebsd.org Subject: Disabling CPUs at boot (was: Re: CPU hotplug) Message-ID: <alpine.BSF.2.00.0904071344080.45341@fledge.watson.org> In-Reply-To: <4451ccf20904062332y677d32a2q683d48c39762a857@mail.gmail.com> References: <4451ccf20904062332y677d32a2q683d48c39762a857@mail.gmail.com>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --621616949-2101459188-1239108529=:45341 Content-Type: TEXT/PLAIN; charset=ISO-2022-JP; format=flowed On Tue, 7 Apr 2009, 崔岩ccuiyyan@sina.com wrote: > Are there any methods to control the number of CPUs online or CPU > hotplug in FreeBSD? > > I want to shutdown some CPUs in the experiments. Hi Yah: Currently, we really only support fully disabling CPUs at boot-time by forcing the CPU's local APIC not to probe: hint.lapic.X.disabled=1 Replace X with the CPU ID, I believe. And don't apply it to the boot processor. :-) Robert N M Watson Computer Laboratory University of Cambridge --621616949-2101459188-1239108529=:45341--
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