Hi,
On Tue, 8 Dec 1998 03:12:22 +0000 (GMT), [EMAIL PROTECTED] (Alan
Cox) said:
>> > tables, there's no technical reason why Linux won't eventually be able
>> > to address that much memory on Intel.
>>
>> Is there any OS that currently does this?
> On intel no. There are some with nasty EMS type hacks for >4Gig on intel,
> but if yo want to have a load of memory for direct sane access you have
> to go to non x86 cpus
Late PII steppings and the Xeons give you 64-bit ptes if you use 3-level
page tables. Uniform 4k VA pages with 36 bit physical addresses.
Totally application-transparent. Just because NT can't utilise that
doesn't mean we have to be equally crippled. :)
The EMS hacks (using large pages) only apply if you insist on using the
traditional 2-level page tables.
Obviously, to use >4G transparently in this way, we need to be able to
deal with physical pages which are not permanently virtually mapped by
the kernel, but that's not a 36-bit issue: we'll have to deal with that
problem even to go up to 4G physical memory.
--Stephen
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