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

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Eric <epretorious@xxxxxxxxx>
  • Date: Wed, 20 Jun 2012 22:41:21 -0700 (PDT)
  • Cc: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Delivery-date: Thu, 21 Jun 2012 05:42:25 +0000
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  • List-id: Xen user discussion <xen-users.lists.xen.org>

From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxx
Sent: Wednesday, June 20, 2012 10:09 PM
Subject: Re: [Xen-users] GRUB boot parameters: dom0_mem

El 20/06/2012 11:33 p.m., Eric escribió:
> 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?
The minimum amount or RAM I have given to Dom0 (Debian Etch? really small footprint) in Xen 3.0 times was 256M. The system was quite usable. Then raised it to 384MB, it allowed me to consider "let's say the hypervisor itself and Dom0 are consuming .5Gb of RAM, the rest can be dedicated to VMs".

Today I give Dom0 768MB of RAM, but the people in internets usually suggests to give it at least 2GB.

For reference, a typical RAM consumption for a just booted PV guest with 64-bit Debian Squeeze system, minimal installation (naked system with sshd) is around 100-120MB. Boots in less then 10 seconds.
Thanks, Alexandre:

The Supermicro P8SC8/P8SCi motherboards in my test lab all have 4GB. However, only 3.1 GB is available so I'm trying to minimize the footprint of all the domains as much as possible.

Eric Pretorious
Truckee, CA

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