As I indicated in an earlier comment, the maximum segment length is still 4G, but the segment base (on Pentium Pro and later) can go anywhere from byte 0 to (64G-1). What's more, a single process can map several such segments, so the actual accessible memory for a single process can reach 64G (minus kernel space).
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Posted by: gus3 on September 26, 2007 04:36 AM#