[ale] Max RAM?

[Warren Myers]

is an x86-64 -based box a possibility? They don't suffer from low RAM
limitations generally.

WMM

On 1/24/07, JK <jknapka at kneuro.net> wrote:
>
> Denny Chambers wrote:
>
> > If I remember correctly the stock kernels with most distributions are
> > not compiled to support 64GB, you have to set a flag in the config file
> > and recompile the kernel to get the 64 GB memory usage. Is this still
> true?
>
> Probably. The name of the option is CONFIG_HIGHMEM_64GB, I think,
> but I don't have a kernel config to look at to confirm at the
> moment.
>
> -- JK
>
> > Denny
> >
> > JK wrote:
> >
> >>Greg Freemyer wrote:
> >>
> >>
> >>
> >>>All,
> >>>
> >>>I need to buy a server in the next several months that may need a lot
> of RAM.
> >>>
> >>>I thought x86 machines had a limit of 4GB, but then I see the HP
> >>>ProLiant DL380 can have up to 32GB max.
> >>>
> >>>Does the CPU model effect it?  AMD? Intel? Xeon? Pentium 4?
> >>>
> >>>Can someone explain what the restrictions are, or point me at a good
> url.
> >>>
> >>
> >>Intel added a hack called "Physical Addressing Extensions" to
> >>later Pentium models.  This hack allows the processor
> >>to address up to 64GB of RAM via bank-switching, though
> >>only 4GB is visible at any particular time.
> >>
> >>Here's a M$ page about PAE support for Windows:
> >>
> >>http://support.microsoft.com/kb/268363
> >>
> >>Linux also supports PAE (as of kernel 2.4 at least),
> >>and can address all 64GB of physical RAM, if
> >>it's present.  The virtual address space for any particular
> >>process, however, is still limited to 3GB (Linux
> >>reserves 1GB [normally] of virtual space for the kernel).
> >>
> >>-- JK
> >>
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> >>
> >>
> >>
> >
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>
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