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Re: [Xen-users] GRUB boot parameters: dom0_mem

To: Randy Katz <rkatz@xxxxxxxxxxxxxxxxxxxxx>

Date: Wed, 20 Jun 2012 22:48:21 -0700 (PDT)

Cc: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>

Delivery-date: Thu, 21 Jun 2012 05:49:14 +0000

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

Thanks, Randy:

I tried that boot parameter in both my nested environment and on my baremetal hypervisor (below) and did not see any change.

[eric@xen2 ~]$ sudo cat /boot/grub/menu.lst
...

title CentOS (2.6.18-274.el5xen)
    root (hd0,0)
    kernel /xen.gz-2.6.18-274.el5
    module /vmlinuz-2.6.18-274.el5xen ro root=LABEL=/ dom0_mem=512M
    module /initrd-2.6.18-274.el5xen.img

[eric@xen2 ~]$ cat /proc/cmdline
ro root=LABEL=/ dom0_mem=512M

Might I have overlooked something?

Eric Pretorious

Truckee, CA

From: Randy Katz <rkatz@xxxxxxxxxxxxxxxxxxxxx>
To: Eric <epretorious@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxx
Sent: Wednesday, June 20, 2012 9:41 PM
Subject: Re: [Xen-users] GRUB boot parameters: dom0_mem

Hi,

from my grub.conf file:

module /vmlinuz-2.6.18-274.7.1.el5xen ro root=LABEL=/ nodmraid dom0_mem=512M pci=nomsi

I have heard talk of 256M but have not tried it yet.

Regards,
Randy

--- Original message ---
Subject: [Xen-users] GRUB boot parameters: dom0_mem
From: Eric <epretorious@xxxxxxxxx>
To: xen-users@xxxxxxxxxxxxx <xen-users@xxxxxxxxxxxxx>
Date: Thursday, 21/06/2012 11:35 AM

I've installed Xen Hypervisor 3.0.3 (CentOS 5.7, i386) inside Virtualbox 4.1.16 (Mageia 1, i686) and have noticed that Dom0 is consuming 85% of the memory allocated to the VM (1GB) so I'd like to reduce this as much as possible in order to make more room for one or two VM's.

Is there a minimum amount of vRAM that can/should be allocated to Dom0 (using the dom0_mem boot parameter) considering that I only want to host one or two VM's?

Eric Pretorious
Truckee, CA
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