Re: [Xen-users] 8GB RAM on a 32Bit Dom0 - Xen 3.2

[ml ml <mliebherr99@xxxxxxxxxxxxxx>]

Hello Lan,

thanks for your reply. I am aware that i need to leave enough ram for my Dom0. I was just wondering if the concept all together works:

Dom0 = 32Bit  but 8GB Ram (in 32Bit can only handle up to 4GB?!)

Cheers,
Mario

On Wed, Jul 3, 2013 at 10:54 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Wed, 2013-07-03 at 10:41 +0200, ml ml wrote:

> Question: Does this make sense? Can i assign almost all my 8GB to my
> guests? Or will this cause problems?

Assigning up to, say, 7GB to guests to ballooning dom0 down to 1GB ought
to be fine. Below that you run the risk of dom0 running short of memory
because some data structures are sized at boot to fit the 8GB size and
cannot be shrunk when ballooning. The point at which this can happen
varies though so you could experiment, e.g. you might be fine going down
to 512M in dom0.

If you run into trouble then you could use the dom0_mem= hypervisor
option to reduce the maximum amount of RAM dom0 can see, which would
cause those static datastructures to be proportionately smaller. Of
course this means that you cannot easily use that RAM for dom0 when no
domains are running, so whether this is appropriate depends on your
usecase.

Ian.

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