Xen users - Apr 2009 - Fast traffic to Dom0 from DomU router halts vifs

Hello.

I have a weird problem. When I download something to Dom0 from internet  
(goes thru DomU router), download goes fine for about a sec, but then it  
stops for few secs. After that, it might continue and it will be fine  
during the rest of the download. However, it might also completly stop. If  
it does stop, all DomU networks stop working (no indications in any logs,  
but ssh/ping from Dom0 or DomU to another DomU doesn''t work nor does  
network connectivy from router DomU to external network), but physical LAN  
still works even to Dom0. I can also access DomUs using ''xm
console''.

Sometimes connectivy comes back after a few minutes, but often I need to  
reboot Dom0.

What makes this even weirder is that that is the only scenario which  
causes it. Download from any DomU works without problems. Download from  
any physical LAN machine works without problems. Download from DomU works  
without problems. Traffic (upload and download) between Dom0 and another  
physical machine works.

This started happening after I upgraded from Debian etch to Debian lenny.  
I have also tried using different network interfaces, but that doesn''t
help.

I have also tried switching bridge controlling to /etc/network/interfaces  
(fd, helo and maxwait 0, stp off + network-dummy @ xend-config.sxp), but  
that didn''t help either.

Any help or advice would be much appreciated.

-Eljas Alakulppi

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On Fri, Apr 10, 2009 at 8:21 PM, Eljas Alakulppi <Buzer@buzer.net>
wrote:
> This started happening after I upgraded from Debian etch to Debian lenny. I
> have also tried using different network interfaces, but that
doesn''t help.
Sounds like you answered your own question :)
If you know that''s when it start to happen, you might want to try
downgrading, starting with the kernel (i.e. use etch''s kernel on
Lenny) on the router domU, and then on dom0. If that doesn''t work as
well, try 2.6.18 kernel from xen.org.

I have a similar setup (domU is the router) with RHEL5, and it works
correctly, so it''s probably Lenny-specific.

Regards,

Fajar

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