RE: Maximum amount of physical memory Pistachio can handle on IA32
"Jan Stoess" <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.l4ka.general |
|---|---|
| Message-ID | <[email protected]> |
Hi Frank, > -----Original Message----- > From: [email protected] [mailto:[email protected] > karlsruhe.de] On Behalf Of Frank Mehnert > > what is the maximum amount of physical memory Pistachio can handle on > IA32 systems? If you are referring to the amount of physical memory Pistachio can handle for user level programs: Pistachio exports up to 4GBytes physical RAM (minus kernel memory) to userland, if available. If you're referring to the maximum amount of physical memory Pistachio can reserve for kernel memory: The maximum is 240 MB. Pistachio remaps all kernel memory in the top virtual address space, which simplifies virt<->phys calculations. Since virtual addresses are a scarce resource on IA-32, kernel memory is limited to 240 Mbytes; the default is 16 MBytes. Pistachio uses physical pages below 256 MBytes RAM for the kernel memory. If there is less than 256MB RAM in the box, Pistachio uses the last n MBytes of physical RAM. Regards, -Jan