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Re: [Xen-devel] mtu on vifX.X

from [Adam Heath]

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To:	Stefan Berger <stefanb@xxxxxxxxxx>
Subject:	Re: [Xen-devel] mtu on vifX.X
From:	Adam Heath <doogie@xxxxxxxxxxxxx>
Date:	Tue, 2 Aug 2005 12:02:22 -0500 (CDT)
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On Tue, 2 Aug 2005, Stefan Berger wrote:

> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 08/01/2005 06:58:23 PM:
>
> > Is there an reason why this is limited to 1500 bytes?  Could it be
> increased?
> > Or, could the ioctl be implemented so it could be changed from the
> cmdline?
> > It'd help with performance between dom0 and domU.
> >
> Usually Dom0 does MAC-level routing of packets for all domU's using a
> bridge in dom0. Packets that go through the bridge don't get fragmented,
> but go out the ethernet card directly. To make sure that all these packets
> have the default ethernet size they are limited to this MTU size. If you
> increase the MTU size, some connections might not work anymore.

But we use routing.

If a user is using bridging, and decides to change their MTU, let them.  Other
nodes on the physical lan may have also been altered.

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