[Xen-users] Xen networking fails after long uptime

[Stephen Childs <childss@xxxxxxxxx>]

We have a number of Xen servers deployed around the country and they have 
proved to be stable for the past few months. However, in the last few 
weeks most of the machines have started to exhibit the same symptoms: the 
networking has stopped working meaning that it is no longer possible to 
access the DomUs (fortunately the Dom0 is OK). In some case, when I log 
onto a DomU using xm console I see a whole string of messages like this:
__alloc_pages: 0-order allocation failed (gfp=0xf0/0)

Uptime for the DomU is around 130-160 days in most cases.

I am using a fairly old version of Xen (around 2.0.1 I think): is there 
any obvious problem that has been fixed in the past months that would 
resolve this issue? (I would have to be fairly sure of concrete 
improvements before upgrading these machines as if anything goes wrong I 
will have to hop in my car and driver for hours!)

Stephen
--
Dr. Stephen Childs,
Research Fellow, EGEE Project,    phone:                    +353-1-6081797
Computer Architecture Group,      email:        Stephen.Childs @ cs.tcd.ie
Trinity College Dublin, Ireland   web: http://www.cs.tcd.ie/Stephen.Childs

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