I found this link and found it to be useful, hope this helps you:
http://lists.xensource.com/archives/html/xen-users/2006-02/msg00077.html
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-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kanwar
Ranbir Sandhu
Sent: Tuesday, June 13, 2006 8:51 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] (xen) Possible bug: Memory squeeze in netback
driver.
On Tue, 2006年06月06日 at 20:47 +0200, Erik Hensema wrote:
> When I start more than about 3 domU's the following messages are 
> logged in dom0:
>
> Jun 6 18:30:03 thebe kernel: printk: 18 messages suppressed.
> Jun 6 18:30:03 thebe kernel: xen_net: Memory squeeze in netback 
> driver.
> Jun 6 18:30:03 thebe last message repeated 9 times
I'm seeing this error as soon I as start a second domU. Like you, I've
found no useful information, at all.
I took a peek at the source code, which was a mistake: now I'm blind.
It's a head scratcher, all right. I have no idea what it means, so I'm
reduced to tinkering with the config files, including lowering memory
usage for my one working domU. Haven't tried it yet, though.
Anybody else run into this? Tips?
Regards,
Ranbir
--
Kanwar Ranbir Sandhu
Linux 2.6.16-1.2111_FC4 i686 GNU/Linux
23:47:43 up 17:17, 4 users, load average: 2.33, 0.78, 0.39 
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