[PLUG] 4GB Address space ?

[Fedor G. Pikus]

4G per process (actually 3 of user space, and 1G of kernel space, you can
hack the kernel to redistribute this a bit, up to about 3.6G user space).
If you enable the 36-bit extension (Intel PAE), you can use >4G RAM up to
64G, but still only 3G per process, so a fully loaded PAE machine with 64G
RAM can run 21 processes of 3G each at the same time, and the remaining 1G
is for the kernel.

On Tue, 17 Dec 2002, Rogan Creswick wrote:

> Date: Tue, 17 Dec 2002 01:50:25 -0800
> From: Rogan Creswick <creswick at cs.orst.edu>
> Reply-To: plug at lists.pdxlinux.org
> To: plug at lists.pdxlinux.org
> Subject: Re: [PLUG] 4GB Address space ?
>
>
> > Is that physical memory, or virtual memory?  Can it address more than
> > that amount of virtual memory, but only 4GB at a time, or what?
>
> Since it is a 32 bit architecture, I'm pretty sure it can only address
> 4 gigs of virtual memory (2^32 == 4gig). I _think_ this is
> per-process, so each process could have a 4gig memory space, but I
> could easily be wrong there.
>
> -Rogan
>
>
> On Tue, Dec 17, 2002 at 01:43:57AM -0800, Karl M. Hegbloom wrote:
> > The "mmap" man page and the help screens in the Linux kernel "make
> > menuconfig" say that the IA32 can address 4GB of memory...
> >
> > Is that physical memory, or virtual memory?  Can it address more than
> > that amount of virtual memory, but only 4GB at a time, or what?
> >
> >
> >
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>
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-- 
                                  Fedor G. Pikus
Mentor Graphics Corporation         | Phone: (503) 685-4857
8405 SW Boeckman Road               | FAX:   (503) 685-1239
Wilsonville, Oregon 97070           | http://www.pikus.net/~pikus/