This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] Network stalls

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Network stalls
From: David Diaz i Torrico <ddiaz@xxxxxxxx>
Date: Mon, 21 Jun 2010 16:14:14 +0200
Cc: Adi Kriegisch <adi@xxxxxxxxxxxxxxx>
Delivery-date: Mon, 21 Jun 2010 07:15:41 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20100621114236.GD23218@xxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <201006151734.11957.ddiaz@xxxxxxxx> <201006211312.30149.ddiaz@xxxxxxxx> <20100621114236.GD23218@xxxxxxxx>
Reply-to: ddiaz@xxxxxxxx
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.13.2 (Linux/2.6.32-22-generic; KDE/4.4.2; i686; ; )
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 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 
> > 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 

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


--- Sistemes - DRAC telemàtic ---------------------
 David Diaz i Torrico
 C/Transversal 226 
 08225 Terrassa (Barcelona)
 Tel: +34 93 736 48 30

Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>