linux-kernel - RE: sched: CPU #1's llc-sibling CPU #0 is not on the same node!

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Date:	Wed, 27 Feb 2013 16:28:29 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Yinghai Lu <yinghai@...nel.org>
CC:	Don Morris <don.morris@...com>, "H. Peter Anvin" <hpa@...or.com>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Renninger <trenn@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tim Gardner <tim.gardner@...onical.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"Sakkinen, Jarkko" <jarkko.sakkinen@...el.com>,
	"tangchen@...fujitsu.com" <tangchen@...fujitsu.com>
Subject: RE: sched: CPU #1's llc-sibling CPU #0 is not on the same node!

> assume first cpu only have 1G ram, and other 31 socket will have bunch of ram

That doesn't seem to be a very realistic assumption. Can you even still buy 1G
DIMMs for servers?   I'd think that a minimum would be to have each of four
channels populated with a 4G DIMM - so 16GB on first cpu. But even that feels
rather low.

I think that making sure that the system can boot is good (and maybe it should
ignore/override[*] parameters that would prevent booting). But let's be realistic
about the cases we actually have to deal with (before somebody comes and talks
about systems with just 16MB).

-Tony

[*] with some noisy warnings in the console log
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