Re: vif tx drops

[Alvin Starr <alvin@iplink.net>]

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@iplink.net              ||




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