[Xen-users] Balloon driver set up failure

[Charles <c@xxxxxxxxxxxxxxxxxxxx>]

I have failed to set up xen balloon driver.

maxmem was added to a working /etc/xen/*.cfg file giving:

kernel      = '/boot/vmlinuz-3.2.0-4-amd64'
extra       = 'ipv6.disable=1'
ramdisk     = '/boot/initrd.img-3.2.0-4-amd64'
vcpus       = '1'
memory      = '128'
maxmem      = '512'
root        = '/dev/xvda2 ro'
disk        = [
                  'phy:/dev/blav2/dns2.XXXXXX.org-disk,xvda2,w',
                  'phy:/dev/blav2/dns2.XXXXXX.org-swap,xvda1,w',
              ]
name        = 'dns2.XXXXXX.org'
vif         = [ 'ip=192.168.42.101, mac=00:16:3E:26:9E:41,
script=/etc/xen/scripts/vif-bridge, vifname=vif101.0' ]
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

The DomU was created. xl list showed the DomU with 128 M memory.

In the DomU:
* /proc/xen/balloon did not exist
* dmesg | grep balloon showed:
    [    0.012061] xen/balloon: Initialising balloon driver.
    [    0.012761] xen-balloon: Initialising balloon driver.
* grep CONFIG_XEN_BALLOON /boot/config-3.2.0-4-amd64 showed:
    CONFIG_XEN_BALLOON=y
    # CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is not set
* The free command showed total memory 110 M

On this evidence the xen balloon driver is not running.  What can I try
next to further analyse or fix?

Versions:
* Hypervisor/Dom0 OS: Debian 7 Wheezy (from Hetzner's image)
* DomU OS: Debian 7 Wheezy (from Debian repos)
* Xen by installing xen-linux-system and xen-tools, giving:
    libxen-4.1
    libxenstore3.0
    xen-hypervisor-4.1-amd64
    xen-tools 4.3.1
    xen-utils-4.1
    xen-utils-common 4.1.4
    xenstore-utils 4.1.4

Configuration: xl toolstack replacing default xm

Best, Charles



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