linux-kernel - Re: [PATCH 0/4] x86_64 boot -v2: Add linked listof struct setup

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Message-Id: <20080328083613.f058172f.pj@sgi.com>
Date:	Fri, 28 Mar 2008 08:36:13 -0500
From:	Paul Jackson <pj@....com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	ying.huang@...el.com, hpa@...or.com, andi@...stfloor.org,
	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] x86_64 boot -v2: Add linked listof struct
 setup_data to boot protocol

YH wrote:
> interesting, that 512nodes/4096 box physics memory is not continuous?

If each node board is stuffed with the same amount of RAM,
and that amount of RAM is a power of two size, then you
are correct that it would be continuous.

But if the nodes are stuffed with unequal amounts of RAM,
or if its not a power of two, then, because we are doing
what Andi figures (breaking the addr into bit fields, for
efficient implementation) then we can end up with many holes.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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