[Xen-devel] xl and autoballooning

[Steven Haigh <netwiz@xxxxxxxxx>]

Hi Ian (and all),

I recently came across a bug in xl autoballooning in Xen 4.2.2 that I 
found mentioned way back in May 2012.
In a nutshell, I tried to create a new DomU with 1024M of memory. The 
Dom0 had 3100M free:
# xl info | grep memory
total_memory           : 20479
free_memory            : 3100

The guest template is very simple:
# cat /etc/xen/template.vm
name            = "template.vm"
memory          = 1024
vcpus           = 1
cpus            = "1-7"
disk            = [ 'phy:/dev/vg_hosting/template.vm,xvda,w' ]
vif             = [ 'mac=20:34:01:36:02:54, vifname=vif.template, 
bridge=br0' ]
bootloader      = "pygrub"

on_poweroff     = 'destroy'
on_reboot       = 'restart'
on_crash        = 'restart'

When I tried to start the DomU, I got the following:
# xl create /etc/xen/template.vm -c
Parsing config from /etc/xen/template.vm
libxl: error: libxl.c:3437:libxl_set_memory_target: new target 18620 for 
dom0 is below the minimum threshold
Setting autoballoon=0 in /etc/xen/xl.conf fixed the bug - however xl 
shouldn't even attempt to balloon the Dom0 when free_memory > required 
memory.
Thoughts?

--
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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