linux-kernel - Re: Possible bug in 2.6.34 slub

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Message-ID: <alpine.DEB.2.00.1006030833070.24954@router.home>
Date:	Thu, 3 Jun 2010 08:34:20 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Randy Dunlap <rdunlap@...otime.net>,
	Giangiacomo Mariotti <gg.mariotti@...il.com>,
	Bill Davidsen <davidsen@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86 maintainers <x86@...nel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: Possible bug in 2.6.34 slub

On Thu, 3 Jun 2010, Pekka Enberg wrote:

> On Tue, Jun 1, 2010 at 10:48 PM, Christoph Lameter
> <cl@...ux-foundation.org> wrote:
> > On Tue, 1 Jun 2010, Randy Dunlap wrote:
> >
> >> > >>> My cpu is an I7 920, so it has 4 cores and there's hyperthreading
> >> > >>> enabled, so there are 8 logical cpus. Is this a bug?
> >
> > Yes its a bug in the arch code or BIOS. The system configuration tells us
> > that there are more possible cpus and therefore the system prepares for
> > the additional cpus to be activated at some later time.
>
> I guess we should CC x86 maintainers then!

Its also a know BIOS problem with Dell f.e. They often indicate more
potential cpus even if this particular hw configuration cannot do cpu
hotplug.
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