linux-kernel - Re: [PATCH] [arch-x86] Allow SRAT integrity check to be skipped

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Message-ID: <20100901213337.GA8844@basil.fritz.box>
Date:	Wed, 1 Sep 2010 23:33:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org, andi@...stfloor.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] [arch-x86] Allow SRAT integrity check to be skipped

On Wed, Sep 01, 2010 at 02:33:18PM -0700, Peter P Waskiewicz Jr wrote:
> On certain BIOSes, SRAT enumeration isn't exported correctly.
> This leads to NUMA node enumeration failure, and causes the kernel
> to fall back onto a single node treated as flat memory.  This
> can happen on large, multi-socket systems (4 or more sockets), and
> becomes problematic for performance.
> 
> This patch adds a boot parameter to allow a kernel to be booted
> with the option to skip the SRAT check.  There are BIOSes in
> production that have these failures, so this will allow people
> in the field to work around these BIOS issues.

Looks good.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>

-Andi

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