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RE: [Xen-users] issue with xen-ballon?

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Robbie Garertt" <rgarrett@xxxxxxxxxxxxxx>
  • Date: Mon, 15 Mar 2010 13:21:43 -0400
  • Delivery-date: Mon, 15 Mar 2010 10:25:52 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcrDuescOUVwIqLARBaalEOKWeOcegAopsZRAAHdaVQ=
  • Thread-topic: issue with xen-ballon?

It would appear that for what ever reason my system is off by 19MB when it comes to 512mb, and 28mb per gb.   I had to set my testing.cfg file to 531MB to get free -m to show 512mb of total memory and 1052 to get it to so show 1024.
can anyone provide any insight as to why or where i may go in an attempt to get this solved?  20mb adds up to a lot when you run several domu's

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Robbie Garertt
Sent: Sun 3/14/2010 5:15 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] issue with xen-ballon?

Hey all,
I have a xen server setup and running version 3.4.2. Kernel version is
My issue here is that when I do a free -m within the Vm is shows less, some times more ram then what the config files shows.   Here is an example of what I see from xend starting the domU.
[2010-03-14 17:09:45 2598] DEBUG (balloon:166) Balloon: 7766704 KiB free; need 526336; done.
When I do a free -m within the domU I get it showing me a total of 506mb.
when I do cat /proc/meminfo is shows a total of 518220
why so many different numbers?  Config options below.
Made the dom0 and domU kernel by doing
git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen
cd linux-2.6-xen
make && make modules && make modules_install && make bzImage && make install
my domU config is
kernel      = '/boot/vmlinuz-'
ramdisk     = '/boot/initrd.img-'
memory      = '512'
#  Disk device(s).
root        = '/dev/xvda2 ro'
disk        = [

#  Physical volumes
#  Hostname
name        = 'Testing'
#  Networking
vif         = [ 'ip=,mac=00:16:3E:78:FB:92' ]
#  Behaviour

on_reboot   = 'restart'
on_crash    = 'restart'

Robbie Garrett
Operational Lead
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