Xen project Mailing List

2010/11/19 Pasi Kärkkäinen <pasik@xxxxxx>

On Fri, Nov 19, 2010 at 10:27:05AM +0100, Olivier Hanesse wrote:
> Hello Pasi,
>
> Are you thinking about the smartpoll patch ?
>
> * [x86/xen] Disable netfront's smartpoll mode by default.
>
> If so, yes the debian kernel we are using, is fine about this issue.
>

Yep, that.

Also there was another bug in the dom0 kernel netback driver,
but I think that should be fixed if the smartpoll bug is fixed..

unless only the other patch was pulled to Debian kernel..

-- Pasi

> Regards
>
> Olivier
>
> 2010/11/19 Pasi Kärkkäinen <[1]pasik@xxxxxx>

>
> On Thu, Nov 18, 2010 at 10:35:46PM +0100, Erwan RENIER wrote:
> > Le 18/11/2010 19:33, Stein van Oevelen a écrit :
> >
> > Nathan Friess wrote:
> >
> > Hi,
> >
> > I have a host running Debian Squeeze with Xen 4.0.1 installed
> from
> > the Debian repository. My host is working fine running 10
> domUs,
> > except that after some number of days one or more domUs lose
> their
> > network interface. In dom0 and domU I'm running kernel
> > 2.6.32-5-xen-amd64 (PV kernel in Debian repo), and interfaces
> are in
> > a bridged config.
> >
> > In case anyone runs into something similar, I did figure out
> how to
> > resolve my issue without having to reboot the domU... which is
> a
> > slight improvement I suppose.
> >
> > Running
> > xm network-detach domUName 0
> >
> > Causes eth0 to disappear in the domain, and the following to
> show up
> > in dmesg:
> >
> > net eth0: xennet_release_rx_bufs: fix me for copying
> receiver.
> >
> > Then running an xm network-attach will bring eth0 back and
> everything
> > will be okay.
> >
> > I also tried rmmoding xen_netfront in domU before I figured out
> the
> > network-detach, but this doesn't help. When modprobing again,
> the
> > domU says "eth0: link is not ready". This also causes any
> subsequent
> > attempt to network-detach in dom0 to get stuck and eventually
> timeout
> > with "Device 0 (vif) could not be disconnected."
> >
> > Also, when the vif is stuck, the TX dropped packets shown in
> dom0 is
> > steadily increasing. It seems that dom0 is having trouble
> sending
> > packets to domU because one of the two gets stuck in an
> unexpected
> > state. At least doing a network-detach will reset the state
> and allow
> > things to run properly again.
> >
> > Nathan
> >
> > _______________________________________________
> > Xen-users mailing list

> > [1][2]Xen-users@xxxxxxxxxxxxxxxxxxx
> > [2][3]http://lists.xensource.com/xen-users

> >
> > I have a similar issue, however my DomU's seem to get their
> connection
> > back after a while automatically, most of the time it happens
> when I
> > physically login to the Dom0 :/
> >
> >
>
> Are you guys running the latest kernel?
>
> This sounds like a bug that was fixed two months ago (or so)
> in the upstream "xen/stable-2.6.32.x" git branch..
>
> -- Pasi
>
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> References
>
> Visible links
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Re: [Xen-users] domU loses network after a while