Re: 2nd attemt at reviving the filesystem limit discussion.

[Neal H. Walfield]

64-bit systems do not necessarily give you 64-bits of virtual address
space (even discounting the kernel's area).  Alpha, for instance, only
gives you 43 bits.  There are real practical reasons for doing this:
the page tables become far too deep and costly for no benefit (8k
pages => 13 bits + 10k entries per page table * 3 levels of page
tables).