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Re: [Xen-users] PAE performance cost on an Dual Opteron 265 with 8GB of RAM

  • To: Xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Robert Hulme" <rob@xxxxxxxxxxxx>
  • Date: Tue, 18 Apr 2006 15:25:21 +0100
  • Delivery-date: Tue, 18 Apr 2006 07:25:57 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

> On Tuesday 18 April 2006 05:37, Robert Hulme wrote:
> > As far as I'm aware to access all 8GB of memory I'll need to enable
> > PAE on xen? Is this correct?
> Isn't PAE just for the 32-bit systems to allow them to access up to 64GB?  I
> believe the Opteron can access 1TB natively.
Err yes. I don't think I was clear enough.

With 64 bit Xen it doesn't need PAE to access all the RAM but my
question is about using a 32 bit Xen kernel (which would need PAE)
rather than a 64 bit kernel as NetBSD is not compatible with 64 bit
AMD64 kernels yet.

I can use a 32 bit kernel with PAE on my Opteron as it is capable of
running normal x86 code (presumably which also includes PAE).

"Women are always right when they're /naked/" - Andrew Neil
"But those enemies of mine who did not want me to be king over
them—bring them here and kill them in front of me." - Jesus (Luke


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