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RE: [Xen-users] dom0 memory requirement

To: "'John A. Sullivan III'" <jsullivan@xxxxxxxxxxxxxxxxxxx>, "'Costa, Jeff'" <jcosta@xxxxxxxxxxxxx>
Subject: RE: [Xen-users] dom0 memory requirement
From: "Sylvain Coutant" <sco@xxxxxxxxxx>
Date: Sat, 17 Dec 2005 16:45:38 +0100
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> > I'm looking for a best practice out there for sizing dom0 RAM that 
> > should be followed. Any ideas?
> <snip>
> I thought I recalled the documentation saying somewhere that the 
> minimum should be 128 MB but I am by no means expert nor have I done 
> any testing to find the lower limit - John

That's up to your tests and requirements.

We have several 64 MB (no swap) dom0 with more than 150 processes in each. That 
works well as long as you don't need to run more memory consuming tasks and you 
optimize your server to just launch absolutely required daemons at startup (we 
boot at just less than 25/30 processes, including kernel ones).

Really, it depends on what will be launched inside it. Some distros won't let 
you boot with such a small amount also. They install too many daemons by 

Lastly, Xen 3 let you define the minimal amount of memory to keep for dom0 in 
xend's config file. You don't need to specify "dom0_mem" at boot time, xen will 
balloon memory out of dom0 as required.




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