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Re: [Xen-users] Xen 3.2 and Ubuntu Hardy with Linux kernel 2.6.24

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen 3.2 and Ubuntu Hardy with Linux kernel 2.6.24
From: "Todd Deshane" <deshantm@xxxxxxxxx>
Date: Thu, 3 Apr 2008 23:06:15 -0400
Delivery-date: Thu, 03 Apr 2008 20:06:44 -0700
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Reply-to: deshantm@xxxxxxxxx
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Hi All,

We think we have narrowed it down to the frontend driver in the domU,
since pings or dhcp requests go out and replies are sent back, but are
not accepted/read by the domU.

It is like the domU can't read from the network.

Basically, I would like to be able to some more visibility into the
problem so that we can either fix it or let the Ubuntu developers know
what the problem is.

Any ideas on how to get some more visibility into the driver?

I will also hang out on ##xen on freenode and #xen on oftc as much as
possible to try to get some ideas.

The bug info is at:





On Tue, Apr 1, 2008 at 5:50 AM, Mark Goldfinch <xen-users@xxxxxxxx> wrote:
> Hi everyone,
>  Myself and some other Ubuntu Linux server users have noticed a difficult
> problem attempting to run a Xen DomU using a Linux 2.6.24 kernel as supplied
> within Ubuntu hardy.  The main symptom exhibited is that network packets
> sent over the network bridge exit the DomU and are seen by the Dom0, but
> when replies are sent back by the Dom0 to the DomU the replies never appear
> within the DomU.
>  The symptoms and attempts at trying to fix it can be seen by looking at the
> bug within launchpad:
>  https://bugs.launchpad.net/ubuntu/+source/xen-3.2/+bug/204010
>  It seems odd to me that Xen DomU support has been merged for 32-bit support
> in Linux mainline, but yet when attempting to run kernels since the merge we
> appear to have real problems with xennet processing inbound packets.
>  I'm yet to confirm that I have the same problem with a patched 2.6.23
> kernel, but when I boot a 2.6.22 kernel from gutsy within my DomU instances;
> everything works just fine.
>  It seems to me that there's some real problem with xennet within the 2.6.24
> kernel, and I would like to debug it.  I've started delving into the
> O'Reilly book on Linux Device Drivers, but is there any pointers or
> assistance anyone here could render with attempting to isolate this problem?
>  Prior to my upgrade to Hardy and Xen 3.2 I've been running Xen 3.0.3 with
> Ubuntu Dapper 6.06 on 2.6.18 with no troubles whatsoever.
>  Thanks in advance,
>  Mark.
>  _______________________________________________
>  Xen-users mailing list
>  Xen-users@xxxxxxxxxxxxxxxxxxx
>  http://lists.xensource.com/xen-users

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