On Mon, Jan 14, 2002 at 03:25:44PM -0800, Matthew Dharm wrote: > Thanks for the info. Too bad "MIPS64" and "mips64" sound exactly the > same on the telephone. > > But, I need to be pedantic, just to be clear on a couple of > questions... > > So, the "mips64" kernel can use 64-bits of address, for RAM >4G? > But, the apps running are always 32-bit? In theory the kernel has the capability to run 64-bit applications. In practice that doesn't work due to the lack of 64-bit apps and stuff. > Does this mean that any individual application can only use 4G of > memory, tho you could have several applications in physical memory > doing this? (i.e. multiple applications using 1G of RAM each, but not > swapping to disk?) In theory we don't limit the address space of 32-bit applications in 64-bit mode so they could go and use all memory and syscalls on the 64-bit address space also. In practice that's just too ugly to be usable so consider 32-bit apps on the 64-bit kernel as limited to 2gb as they are currently. You can however run an arbitrary number of these processes. > Does this mean we could map PCI memory/IO addresses above 4G and have > it work? Sure. Ralf
