Re: [Xen-users] Setting vifX.Y's MTU automatically in Xen 3

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Apr 15, 2011 at 04:41:02PM +0300, Pasi Kärkkäinen wrote:
> On Fri, Apr 15, 2011 at 09:13:14AM -0400, Digimer wrote:
> > On 04/15/2011 07:37 AM, Pasi Kärkkäinen wrote:
> > > Try doing it before setup_bridge_port ?
> > 
> > Didn't help.
> > 
> 
> Ok.
> 
> > > Do you need to specify a patch for ifconfig?
> > 
> > What patch might that be?
> > 
> 
> Erm.. I meant 'path', not 'patch' :)
> 
> > > Well something goes wrong then.. 
> > 
> > Heh, yup. :)
> > 
> 
> On mailinglist archive I've seen people using jumbo frames with domUs.. 
> so it's definitely doable.
> 

Ok, followup for the list archives.. 

pvops 2.6.32.x dom0 kernel contains this patch since February 2010:
"xen/netback: Allow setting of large MTU before rings have connected":
https://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commitdiff;h=bee2eec2355c4bf4e149a426d5e30527162de566

So changing vif mtu to 9000 before attaching to the bridge works
when using pvops 2.6.32 dom0 kernel.

Patch for 2.6.18 kernel here:
http://lists.xensource.com/archives/html/xen-devel/2011-02/msg00413.html

Redhat RHEL5 bugzilla entry for adding that patch to el5 kernel-xen dom0 
netback:
https://bugzilla.redhat.com/show_bug.cgi?id=697021

-- Pasi


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