Xen users - Feb 2008 - Xen on 32bit machine with 8GB of RAM

I wanted to install Xen on 32bit processor with 8GB RAM. I am running Debian
on it.
The general Kernel can only address ~4GB of RAM. So, Is it necessary to
install BigMEM kernel so that all the memory get addressed?  And then
install xen kernel.

Or ?? Suggestions welcome.

Thanks,
gorkhe


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On Thursday 28 February 2008 14:46:12 gorkhe wrote:
> I wanted to install Xen on 32bit processor with 8GB RAM. I am running
> Debian on it.
> The general Kernel can only address ~4GB of RAM. So, Is it necessary to
> install BigMEM kernel so that all the memory get addressed?  And then
> install xen kernel.
Yes the kernel has three steps of memory limit, ~900MB, 4GB and 64GB, the last 
only with PAE on. You need to turn this mode on in the kernel on
"Processors
Type and Features" -> "High Memory Support". Don''t
forget to compile Xen with
PAE, if you have issues with this put XEN_TARGET_X86_PAE=y in the make.
>
> Or ?? Suggestions welcome.
>
> Thanks,
> gorkhe


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On Thu, Feb 28, 2008 at 09:46:12AM -0800, gorkhe wrote:
> I wanted to install Xen on 32bit processor with 8GB RAM. I am running
Debian
> on it.
> The general Kernel can only address ~4GB of RAM. So, Is it necessary to
> install BigMEM kernel so that all the memory get addressed?  And then
> install xen kernel.
No, the BigMem kernel will be useful when you boot without xen.
Otherwise, it is only the xen and the kernel compiled to run under xen,
that matters.

For xen, it must be compiled with PAE support, thus so does the kernel
to run under xen.

If the xen kernel for Debian is the same as the standard kernel, then
you do need the BigMem kernel, but it''s usually independent.

-- 
lfr
0/0


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>I wanted to install Xen on 32bit processor with 8GB RAM. I am running
Debian on it.
>The general Kernel can only address ~4GB of RAM. So, Is it necessary to
install BigMEM kernel so that all the memory get addressed?  And then
install xen kernel. 
>Or ?? Suggestions welcome.
>Thanks,
>gorkhe


You already gave the correct answer. Build a kernel with bigmem and pae
enabled.

 

Jeroen



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gorkhe wrote:
> I wanted to install Xen on 32bit processor with 8GB RAM. I am running 
> Debian on it.
> The general Kernel can only address ~4GB of RAM. So, Is it necessary 
> to install BigMEM kernel so that all the memory get addressed?  And 
> then install xen kernel.
>
> Or ?? Suggestions welcome.
>
> Thanks,
> gorkhe
>
You need PAE kernels: I assume for Debian, these are called bigmem 
kernels. You can install them in any order, you''ll just need to do 
setting up of grub and reboots to activate the new kernels.

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