I think that on Linux, the 4G/4G split never made it, so in practice the limit is around 64GB due the limited amount of lowmem available to the kernel in the re

I think that on Linux, the 4G/4G split never made it, so in practice the limit is around 64GB due the limited amount of lowmem available to the kernel in the regular 3G/1G split. https://lwn.net/Articles/39283/ https://lwn.net/Articles/39283/