linux-kernel - Re: [GIT PULL] x86/apic changes for v2.6.38

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Message-ID: <AANLkTinakrwszoiV9qv3QTpUa0-gt600pn3dg2Cv7H=L@mail.gmail.com>
Date:	Thu, 6 Jan 2011 14:27:59 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [GIT PULL] x86/apic changes for v2.6.38

Taking a slight tangent ... it would seem that nr_cpus/maxcpus are woefully
inadequate on NUMA systems. If I have a four node NUMA machine and
I boot with maxcpus=4 ... I probably want one cpu on each node. I might
want all four of the cpus from the same node (so I can check memory
allocation from cpu-less nodes?). What I almost definitely don't want is
the first four cpus that the BIOS listed in the MADT (which could be
scattered in any way across nodes).

-Tony
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