Date: Tue, 28 Jan 2003 19:35:37 +0100 From: Wilko Bulte <wkb@freebie.xs4all.nl> To: Andre Guibert de Bruet <andy@siliconlandmark.com> Cc: Adam Migus <adam@migus.org>, current@FreeBSD.ORG Subject: Re: Force 1 CPU on SMP kernel? Message-ID: <20030128193537.B39244@freebie.xs4all.nl> In-Reply-To: <20030128122234.F66869@alpha.siliconlandmark.com>; from andy@siliconlandmark.com on Tue, Jan 28, 2003 at 12:33:32PM -0500 References: <49857.192.168.4.2.1043728382.squirrel@mail.migus.org> <20030128095107.GA2628@submonkey.net> <20030128095349.GK36536@ns2.wananchi.com> <20030128030248.B45041@FreeBSD.org> <49491.192.168.4.2.1043774271.squirrel@mail.migus.org> <20030128122234.F66869@alpha.siliconlandmark.com>
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On Tue, Jan 28, 2003 at 12:33:32PM -0500, Andre Guibert de Bruet wrote: > > > On Tue, 28 Jan 2003, Adam Migus wrote: > > > Yes, just to be more explicit. What I want to do is get the > > 'real' difference a second processor makes. ie. If I run > > GENERIC I'm not incurring the overhead associated with SMP/APIC. > > I want to use the same kernel making as small a change as > > nessessary to have the machine start/use just one CPU. > > I'm not aware of any hacks to disable APs through loader.conf. If you're > trying to benchmark the system's performance with 1 vs N CPUs, you're best > off pulling all but the BSP CPU out of the machine. For such a benchmark > to be accurate, you shouldn't make any software changes (kernel, daemons > or startup configs). VOlunteers to implement psradm maybe? W/ -- | / o / /_ _ wilko@freebie.xs4all.nl |/|/ / / /( (_) Bulte To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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