linux-kernel - why choose 896MB to the start point of ZONE

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Date:	Tue, 6 Apr 2010 22:37:46 +0800
From:	hayfeng Lee <teklife.kernel@...il.com>
To:	linux-kernel@...r.kernel.org, linux-kernel@...kernel.org,
	kernelnewbies@...linux.org
Subject: why choose 896MB to the start point of ZONE_HIGHMEM

hello,every one.
I have a question:
Why does linux choose 896MB to do a start point of ZONE_HIGHMEM and
the end point of ZONE_NORMAL. Just for experience?
What is the advantages?
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