Messages in this thread | | | Date | Mon, 28 Apr 2003 19:36:08 +0200 | From | Carl-Daniel Hailfinger <> | Subject | Re: [Lse-tech] Re: maximum possible memory limit .. |
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Dave Hansen wrote: > Carl-Daniel Hailfinger wrote: > >>Cool. Sorry to be pestering about the 64-bit limits, but can we really >>use 2^64 bytes of memory on ia64/ppc64/x86-64 etc.? (AFAIK, 64-bit >>arches don't suffer from a small ZONE_LOWMEM.) > > [...] > Don't forget that highmem starts to be needed before the 4G boundary. > The kernel has only 1GB of virtual space (look for PAGE_OFFSET, which > defines it), which means that you start needing to pull all of the > highmem trickery before you get to the actual limits.
It seems I misunderstood the concept of highmem. I thought highmem was not needed on 64-bit arches. Thanks for pointing that out to me. > > Nobody knows how far it will go. It's fairly safe to say that, at this > rate, Linux will keep up with whatever hardware anyone produces.
That is the answer the original poster was looking for.
> Unless, of course, someone gets even more perverse than PAE. :)
hehe ;-) Can you say PAE in userspace?
Regards, Carl-Daniel -- http://www.hailfinger.org/
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