Re: "3.5GB user address space" option.

[Andrea Arcangeli]

On Wed, Oct 17, 2001 at 09:38:35PM -0700, H. Peter Anvin wrote:
> Followup to:  <[e-mail]>
> By author:    "Oleg A. Yurlov" <[e-mail]>
> In newsgroup: linux.dev.kernel
> >
> > 
> >         Hi, folks,
> > 
> >         How  I  can  use  3.5GB  in my apps ? I try malloc() and get error on 2G
> > bounce... :-(
> > 
> >         Hardware - SMP server, 2Gb RAM, 8Gb swap, kernel 2.4.12aa1.
> > 
> 
> Get a 64-bit CPU.  You're running into a fundamental limit of 32-bit
> architectures.

Actually 3.5G per-process is theoretically possible using a careful
userspace as Rik suggested with -aa after enabling the proper
compile time configuration option. So for apps that needs say 3G
per-process it should work just fine. But of course for anything that
needs more than that 64bit is the right way to go :)

Andrea