Re: [Xen-devel] vif tx drops

[Alvin Starr <alvin@xxxxxxxxxx>]

Ian Pratt wrote:

> > It looks like xen0 or the bridge stuff is not getting some packets
> > destined for xenU.
> >
> > I traced an ssh connection from a machine running stock 2.4.25
> > to a xenU domain by running tcpdump on xen0 and on the other machine.
> >
> > The trace on xen0 shows a 4 second gap where no ssh packets were received
> > for the xenU domain even though the other machine was sending retransmits. 
> > Only the last retransmit appears in the xen0 dump.
> > On xen0, tcpdump -i eth0 shows the 4 second gap between packets
> >    
> going to xenU:
>
>
> If they're not showing up here, then I think we can rule out
> anything to do with the bridge code as we're looking before the
> bridge. 
>
> In fact, its hard to see how they could be dropped by anything
> other than the driver, and you'd expect to see the dropped count
> bumped. What driver is this?
>
> Even if something (e.g. Xen) went wild and took the CPU away for
> 4 seconds, you'd wouldn't expect to loose packets as the NIC
> would buffer them. 
>
> I'll place money that you've still got some duplicate MAC
> addresses out there...
>
> Ian
>  
I am seeing a similar thing with only one xenU domain running.
The thing is that I am trying to run an ISCSI net boot. I have much 
bigger problems just now so I have not had a chance to look at what is 
going on with the dropped packets.
But I am sure I do not have an issue with a duplicate mac address. I do 
now believe anybody sihpps with a mac address of aa:00:00:00:00:0X where 
X is 1,2 or 3.
--
Alvin Starr                   ||   voice: (416)585-9971
Interlink Connectivity        ||   fax:   (416)785-3668
alvin@xxxxxxxxxx              ||




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