why choose 896MB to the start point of ZONE_HIGHMEM

From: hayfeng Lee
Date: Tue Apr 06 2010 - 10:37:55 EST

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?
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/