From: John Wilson <wilson at dbit.com> John...I probably don't understand your use case, but Linux has had pretty robust PAE kernel support for a while. User space apps are of course still limited to 4G-ish, but the kernel can see up to 64G. I've used it on bigmem servers that had to run legacy apps that had heartburn with 64-bit distros. There were a couple of things that were weird (I seem to recall issues with vmalloc()...it's been a while), but generally worked as expected. KJ