William Lee Irwin III recently announced on the lkml that he'd successfully gotten Linux running on a 64GB x86 server.
His posts included two different boot message logs, one without his page clustering patch, and one with. In the latter case, his patch overcomes the
1GB mem_map virtual space limitation imposed by x86 32-bit servers, without which the kernel over-runs allowable memory space.
April 4, 2003