Hi everybody
It''s basically possible to use a higher MTU than 1500 but with some
constraints. We have a setup for using MTU 5000 for our domUs.
The procedure is as follows:
- enable MTU 5000 on the physical interface of dom0
- enable MTU 5000 on the interface of domU
- after domU startup, enable MTU 5000 at the virtual interface (vif)
of that domU in dom0
- the Xen bridge still shows MTU 1500. The MTU cannot be set for
bridges but afaik they also don''t care about MTU size.
The constraints are:
- MTU 5000 doesn''t work between two domUs inside the same dom0
- MTU 5000 doesn''t work reliable between two domUs inside different
dom0s (may be issue with our iptables setup?!)
- MTU 5000 works reliable between domUs and physical servers
I hope this helps you.
It would be very nice to see native jumbo frame support in Xen in the
future. We currently use Xen-3.2.0 but I also couldn''t find anything
related to this topic in the Xen-3.3.0 changelog. So I filled a bug
at: http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1341
Kind regards
Reto Gantenbein
On Mar 7, 2008, at 10:54 AM, Pasi Kärkkäinen wrote:
> On Thu, Mar 06, 2008 at 04:24:25PM +0000, Gareth Bult wrote:
>> Hi,
>>
>> After failing to make Jumbo frames work on my Xen installation, I
>> read that Xen doesn''t support Jumbo Frames.
>>
>
> What did you actually do/configure when you tried jumbo frames?
>
>> Is this really true?
>>
>
> I''m not sure.. I have never really tried jumbo frames with Xen..
>
> I assume first you need to configure your ethX (pethX) devices to
> use 9000
> bytes mtu.. and then your bridge devices to use 9000 mtu too.
>
> After that you need to configure your ethX devices in domU to use
> 9000 mtu.
>
> Is that enough? Has someone tried this?
>
> -- Pasi
>
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