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Re: [Xen-users] Intermittent network in HVM domU

To: Roberto Bifulco <roberto.bifulco2@xxxxxxxx>
Subject: Re: [Xen-users] Intermittent network in HVM domU
From: Todd Deshane <todd.deshane@xxxxxxx>
Date: Thu, 5 May 2011 09:01:41 -0400
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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On Thu, May 5, 2011 at 8:17 AM, Roberto Bifulco
<roberto.bifulco2@xxxxxxxx> wrote:
> Dear Xen Community,
> I'm using Xen to virtualize some Windows and Linux servers.
> Currently I'm using two machines, one for production, which runs Xen 3.2.1
> with Debian5 Dom0 and the second one (Xen 4.0.1, openSuse 11.4 dom0) for
> development/testing.
> I'm experiencing some problems with an HVM linux domU over the development
> machine.
> In particular, the linux domU runs network services (web server, ssh), and,
> periodically, in an intermittent manner, the domU's network goes off.
> I realized that the vnc console attached to the domU still works, i.e., the
> domU is responsive, while the network doesn't work.
> The host machine is underloaded, i.e., it runs just two hvm domUs (the linux
> domU and an idle windows domU) and is configured in this way:
> one Intel processor with 4 cores,
> dom0 with 1 vcpu pinned to core 0
> other domains with 1 vcpu pinned to cores 1-3
> changing the dom0 credit scheduler configurations doesn't change this
> behaviour (e.g., assigning to dom0 a weight of 2048 while other domains have
> weight set to 256).
> Any suggestion on how I can solve this problem, or how can I figure out
> WHERE is the problem?

Have you tried installing the PVonHVM drivers in the Linux domU?

Have you tried disabling transmit checksum offloading?

Does a linux PV guest have the problem or just HVM?


> Thanks,
> Roberto
> --
> Roberto Bifulco, Ph.D. Student
> robertobifulco.it
> COMICS Lab - www.comics.unina.it
> _______________________________________________
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> http://lists.xensource.com/xen-users

Todd Deshane

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