Re: [Xen-users] Balloon driver set up failure

[Charles <c@xxxxxxxxxxxxxxxxxxxx>]

Thanks Ian :-)

On 25/09/14 15:22, Ian Campbell wrote:
> On Thu, 2014-09-25 at 08:23 +0530, Charles wrote:
>> 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
> 
> Did you mount xenfs on /proc/xen?

No.  I added it to fstab and rebooted.  Still no /proc/xen/balloon (only
capabilities, privcmd and xenbus).

>> * 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 makes you say that?
> 
> It looks like the balloon core is there and running (you have ~128M
> free, less some normal overheads, which is expected). You haven't asked
> the balloon driver to change that (e.g. with xl mem-set) so it won't
> have done anything.

The total memory is ~128M, not the free.

Charles

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