Xen users - Feb 2006 - Xen 3 on machine > 4 GB of RAM

I have a system with 8 GB of RAM.  Xen 3 works fine but it only sees 4
GB of RAM.  What do I need to do to support more memory?  I don''t see
a hugemem kernel using the installation provided by the precompiled
Xen for Fedora Core 4.

Thanks for any help.

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I assume hugemem means x86 PAE. I''ve never worked with PAE, but there
is
at least some support for it.

x86_64 is probably better if you have the hardware.

Good luck!
Andrew
-- 
Andrew D. Ball
aball@us.ibm.com

"Festina Lente" $\approx$ "Make haste slowly"
  -- Caesar Augustus

On Wed, 2006-02-08 at 11:54 -0800, Fong Vang wrote:
> I have a system with 8 GB of RAM.  Xen 3 works fine but it only sees 4
> GB of RAM.  What do I need to do to support more memory?  I don''t
see
> a hugemem kernel using the installation provided by the precompiled
> Xen for Fedora Core 4.
> 
> Thanks for any help.
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 


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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com 
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fong Vang
> Sent: 08 February 2006 19:55
> To: xen-users@lists.xensource.com
> Subject: [Xen-users] Xen 3 on machine > 4 GB of RAM
> 
> I have a system with 8 GB of RAM.  Xen 3 works fine but it 
> only sees 4 GB of RAM.  What do I need to do to support more 
> memory?  I don''t see a hugemem kernel using the installation 
> provided by the precompiled Xen for Fedora Core 4.
You''ll need to use either PAE or 64-bit version of Xen and Dom0.
It''s
not too difficult to change it. .../xen/arch/x86/Rules.mk: set pae ?= y
And configure the kernel to CONFIG_HIGHMEM64G in your .../xen/linux*0 
Goto your root of Xen (...), and do "make clean world". 

64-bit would be my preferred solution, which is just as easy - but
you''ll need to re-install the base OS to be a 64-bit OS [not REALLY,
but
that''s the EASY way to do it. If you want to do it the hard way,
I''m
sure there''s places where they explain how to cross compile the kernel
and Xen, then boot 64-bit with mostly 32-bit software around it - but I
would think that''s a lot more work than it''s worth]. 

There''s probably a 64-bit precompiled image somewhere. I''m not
sure if
there''s a PAE version available precompiled.

--
Mats


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