[Xen-devel] Re: Re: help with bugs

[Sean Dague <sean@xxxxxxxxx>]

On Fri, Aug 05, 2005 at 12:48:33AM +0100, Ian Pratt wrote:
> > On Thu, Aug 04, 2005 at 10:48:50PM +0100, Ian Pratt wrote:
> > > > >  BUG62  eth0 -> veth0 in network script can loose network
> > > > I can make this bug come and go at will based on which of the
> > > > 2 network interfaces are part of the bridge.  I added that 
> > > > information into the bugzilla bug, hopefully that helps.
> > > 
> > > Are you changing the default 'netdev' at the top of the 
> > network script?
> > 
> > No actually, I guess I'm not even clear why veth0 exists, as 
> > everything works quite nicely for me without it functioning.
> 
> If you're running services in dom0 that are used by other domains you
> are liable to get head-of-line blocking or even deadlock of the domU's
> networking unless you use veth0:  all of the domU's skb's could end up
> getting queued in dom0 socket buffers.
> 
> veth0 avoids this by copying packets destined for dom0 and giving the
> buffer back to the domU. 

Is there a test case for this?  I've been running some services in dom0 and
apparently running without veth0 for quite some time.  It would be good to
have a test that shows this problem.

        -Sean

-- 
__________________________________________________________________

Sean Dague                                       Mid-Hudson Valley
sean at dague dot net                            Linux Users Group
http://dague.net                                 http://mhvlug.org

There is no silver bullet.  Plus, werewolves make better neighbors
than zombies, and they tend to keep the vampire population down.
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