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Re: [Xen-users] Set memory free after shutdown

From: "Todd Deshane" <deshantm@xxxxxxxxx>

Date: Fri, 18 Jan 2008 23:06:25 -0500

Delivery-date: Fri, 18 Jan 2008 20:07:00 -0800

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List-id: Xen user discussion <xen-users.lists.xensource.com>

On Jan 18, 2008 12:35 PM, Daniele Piaggesi <d.piaggesi@xxxxxxxxxxxx> wrote:

Hi boy.

I have to ask you a question about memory management in Xen.

I have this situation: a server with 16Gb of Ram and 9 xen virtual
machine. In this moment the sum of memory allocated from all virtual
machines is 12Gb but the free memory for the dom0 is only 1Gb.
And if I stop any other vm the free memory doesn't change.

There's a way to set the memory free for the dom0 when I stop a virtual
machine?

dom0 is given a certain max amount of memory at boot, if my understanding is correct.

You should look into the dom0_mem Xen boot option to adjust this.
http://tx.downloads.xensource.com/downloads/docs/user/#SECTION04130000000000000000

It seems that dom0 could then reclaim up to that (dom0_mem) maximum amount of memory freed by VMs.

Regards,
Todd

Thanx in advance

Daniele Piaggesi

--
Daniele Piaggesi
Linux System Administrator
--------------------------
(Pro-Netics) S.p.A.
Sourcesense - making sense of OpenSource
http://www.pronetics.it
Via E. L. Cerva 127/C
00142 Roma - Italy
Tel (+39) 0651530849
Mob (+39) 3286176226

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