WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] xen.git branch reorg

To: Boris Derzhavets <bderzhavets@xxxxxxxxx>
Subject: Re: [Xen-devel] xen.git branch reorg
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sat, 25 Apr 2009 11:19:44 +0300
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Christophe Saout <christophe@xxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Delivery-date: Sat, 25 Apr 2009 01:20:14 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <724403.69764.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1240612762.1918.5.camel@xxxxxxxxxxxxxxxxxxxx> <724403.69764.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.13 (2006-08-11)
On Fri, Apr 24, 2009 at 11:55:19PM -0700, Boris Derzhavets wrote:
> Chris,
> 
> I have to apologize. Turning off segmentation offloading may work as well.
> Just now it fixed VNC issue on bare metal - CentOS 5.2 with Atansic Gigabit
> Ethernet driver (ASUS P5KR) . I gonna try it at DomUs at my earliest 
> convenience.
>

Have you tried another NICs? It could be a bug in the driver for that NIC..

-- Pasi

 
> Boris.
> 
> --- On Fri, 4/24/09, Christophe Saout <christophe@xxxxxxxx> wrote:
> From: Christophe Saout <christophe@xxxxxxxx>
> Subject: Re: [Xen-devel] xen.git branch reorg
> To: "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>
> Cc: bderzhavets@xxxxxxxxx, "Xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Ian 
> Campbell" <Ian.Campbell@xxxxxxxxxx>
> Date: Friday, April 24, 2009, 6:39 PM
> 
> Hi Jeremy,
> 
> > >  In meantime time i see,  that 2.6.30-rc3&rc2&rc1-tip are
> affected.
> > > Solution is the same as on Solaris xVM Linux DomUs about one
> > > year ago -  is  to disable checksum (nothing else) offloading at
> Linux 
> > > DomUs ( CentOS 5.3, Ubuntu 9.04)
> > >
> > > /usr/local/sbin/ethtool -K etho tx off
> >
> > OK, that's a good lead.
> 
> Yes, I've been seeing this too (and meant to investigate it before
> claiming there's abug) and I can confirm that turning off segmentation
> offloading "cures" the problem here too.
> 
> Now the tcpdump on Dom0 looks interesting.  It repeatedly sees a packet
> with 2880 byte from DomU coming in, which is then dropped and ICMP
> "fragmentation needed" sent back, the DomU resends a 1440 byte packet
> (after some delay), which then goes through, but then the next one is a
> 2880 byte one again, and so on.
> 
> FYI: My Dom0 is running NAT, in case this is relevant.
> 
>       Christophe
> 
> 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

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