On Sun, Aug 31, 2003 at 03:34:34PM +0200, Ralf Baechle wrote: > The explanation you gave isn't exactly right. A 2GB/2GB split would normally > support 2GB of low memory. We don't on MIPS due to the very inconvenient and > unchangable mappings of KSEG0/KSEG1 - something that may have been sweet > in '85 when the address map was designed but not today when 32-bit address > spaces are beginning to be fairly tight. > > Highmem works ok in 2.4 as long as you have a reasonably low ratio of > highmem to lowmem. For typical loads that means going beyond 4:1 isn't > sensible but the actual number may vary much based on exact system > configuration or workload. > > Ralf > So what is a practical limit to total memory. Daniel
