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Re: [Xen-users] Network stalls

To: David Diaz i Torrico <ddiaz@xxxxxxxx>
Subject: Re: [Xen-users] Network stalls
From: Adi Kriegisch <adi@xxxxxxxxxxxxxxx>
Date: Mon, 21 Jun 2010 13:42:36 +0200
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> 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 IIRC.

> 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.

I am pretty sure the upgrade to the latest kernel will fix the issue for

-- Adi 

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