Re: [Xen-users] Network stalls

[David Diaz i Torrico <ddiaz@xxxxxxxx>]

A Dilluns, 21 de Juny de 2010, Adi Kriegisch va escriure:
> Hi!
> 
> > After a bunch of tests and sniffings I found out that the problem was not 
due to 
> > Xen, it is caused by the 2.6.3x kernels.

> The one issue you mention ("Attempting to checksum a non-TCP/UDP packet,
> dropping a protocol 1 packet") seems to be caused by an issue in netback.
> See eg. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583366 ; you
> should be using at least 2.6.32.14 IIRC.

I'll give it a try, but it doesn't seem to be the cause of the problem.
 
> > It looks like all kernels after 2.6.18 have issues with the congestion 
control 
> > which make stall the connections at random; Disabling the whole congestion 
> > control stuff, seems to have resolved the problem.
> Actually I don't think so: Way too many people would stumble across such an
> issue within the kernel. Chances this goes unnoticed for such a long time
> are nil.

It only seems to happen to some Windows machines behind a NAT, and randomly, 
so it's quite dificult to catch and to reproduce. I've a proxy box running 
ubuntu with a 2.6.32-22 kernel, with the same problem, but we didn't ever 
noticed the problem until I ran the same tests that make the xen machine 
stall.

> I am pretty sure the upgrade to the latest kernel will fix the issue for
> you...
> 
> -- Adi 
> 
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> http://lists.xensource.com/xen-users
> 
> 


-- 
Siau,

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