Re: large memory support for x86

From: Oliver Xymoron (
Date: Thu Oct 12 2000 - 12:16:04 EST

On Wed, 11 Oct 2000, Kiril Vidimce wrote:

> My primary concern is whether a process can allocate more than 4 GB of
> memory, rather than just be able to use more than 4 GB of physical
> memory in the system.

Define allocate. There are tricks you can play, but userspace is still a
flat 32-bit address space per-process.
> Also, I see that the highmem support is just an option in the kernel.
> Does this mean that there is a significant performance penalty in using
> this extension?

It doesn't come for free, but it's almost certainly a win for anyone who
has that much memory.

 "Love the dolphins," she advised him. "Write by W.A.S.T.E.." 

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