[cryptonector]

Plus 53-bit indices exceed the amount of memory that many 64-bit architectures can address (x86_64 is 48 bits, ARM is either 48 or 52 bits).

[zokier]

x86-64 is 57 bits these days https://en.wikipedia.org/wiki/Intel_5-level_paging

[cryptonector]

Thanks for the correction! TIL.

[namibj]

Tbf, it's not commonly run because it increases TLB miss latency for rarely any benefit (why are you mmap-ing so much? How can you afford to keep that much data around...).