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RE: [Xen-users] Network stall

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Boudreau Luc" <luc.boudreau@xxxxxxxxxxxx>
  • Date: Thu, 27 Sep 2007 10:56:39 -0400
  • Delivery-date: Thu, 27 Sep 2007 07:57:31 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcgAjG1jGGaVf4+RSMSDHS+UeaUF6QAe2OFw
  • Thread-topic: [Xen-users] Network stall

Thanks for the tip Stephan,

Unfortunately, it didn't fix the wagon. The network still stalls upon the 
transfer of large files. Also, packets are beeing dropped from the peth0 RX on 
my dom0. I tried disabling the RX checksum check but it refused to do so and it 
wouldn't be wise anyways.

Got any other idea ?

-----Message d'origine-----
De : Stephan Seitz [mailto:s.seitz@xxxxxxxxxxxx] 
Envoyé : 26 septembre 2007 18:27
À : Boudreau Luc
Cc : xen-users@xxxxxxxxxxxxxxxxxxx
Objet : Re: [Xen-users] Network stall

Boudreau Luc schrieb:
> I share a file via any protocol on any domU. The file has to be of a 
> big enough size so that the upload takes a while. 1 gig usually does 
> the trick. Then, I logon to another machine (physical machine, that 
> is...), and start retreiving it from the domU instance. After some 
> random number of seconds, the network stalls, the link goes down, and 
> the packets start beeing dropped.

Try to disable TCP checksum in every domU for every interface that connects to 
the bridge.

Inside the domU's: ethtool -K eth0 tx off

I dont' know this for CentOS, but on debian-like systems the perfect place is 
/etc/network/interfaces .

As an example:

iface eth0 inet static
        post-up ethtool -K eth0 tx off

You could try this via console first and watch if your network performs better.


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