[Xen-users] Re: Dom0 seeing 2Gb, but not 4GB ram

[Kyler Laird <Kyler@xxxxxxxxxx>]

Mark Lassiter <mackdaddylassiter@xxxxxxxxx> wrote:

> I don't believe I can use PAE, thats an intel thing,
> right?

No!  I can confirm that an Opteron machine can use PAE under Xen.

I first tried the xen-unstable binary with PAE enabled.  It recognized
all 8GB in my Dual Core AMD Opteron(tm) Processor 265 machine.

It took me awhile to figure out how to make a PAE-enabled Xen.  Here are
the approximate steps I took.

 1.     hg clone http://xenbits.xensource.com/xen-unstable.hg

 2.     snarf 
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/downloads/xen-unstable-install-x86_32p.tgz
 - | tar zx

 3.     cd xen-unstable.hg

 4.     cp ../xen-unstable-install/install/boot/config-2.6.12.6-xen0 
./linux-2.6-xen-sparse/arch/xen/configs/xen0_defconfig_x86_32

 5.     cp ../xen-unstable-install/install/boot/config-2.6.12.6-xenU 
./linux-2.6-xen-sparse/arch/xen/configs/xenU_defconfig_x86_32

 6.     Edit ./Config.mk.  Change "XEN_TARGET_X86_PAE  ?= n" to
"XEN_TARGET_X86_PAE  ?= y".

 7.     Edit ./linux-2.6-xen-sparse/arch/xen/configs/xen0_defconfig_x86_32
for other changes you need.  (I enable LBD, ATA over Ethernet and serial
console.)

 8.     make

 9.     make install

10.     reboot

        xentop - 18:06:34   Xen 3.0-devel
        1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 
shutdown
        Mem: 8322620k total, 200316k used, 8122304k free    CPUs: 4 @ 1793MHz


However...do note that I was seeing 4GB *without* PAE.  If you just want
4GB you shouldn't need PAE.

--kyler


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