[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] set mtu from bridge also on vif interface
On Mon, 2011-02-07 at 09:25 +0000, Olaf Hering wrote: > On Mon, Feb 07, Ian Campbell wrote: > > > On Sun, 2011-02-06 at 13:41 +0000, Olaf Hering wrote: > > > Apply mtu size from bridge interface also in vif interface. > > > This depends on a kernel change which allows arbitrary mtu sizes until > > > the frontend driver has connected to the backend driver. Without this > > > kernel change, the vif mtu size will be limited to 1500 even with this > > > change to the vif-bridge script. > > > > > > Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> > > > > In my experience the bridge will only allow it's MTU to be set to the > > minimum of all the ports (or 1500ish if there are no ports) and will > > reset to the new minimum when you add a new port. > > > > So does this patch do anything in the absence of the ability to > > configure the MTU of a VIF from the toolstack? > > This depends if the bridge interface is part of the Xen toolstack > configuration or if the bridge is part of the system configuration. In > my setup the bridge is part of the system configuration and gets its mtu > from the config of the physical interface, eth0 in my case. So br0 has > mtu of 9000 already when vif-bridge runs. When I was playing with this last week I was using an internal bridge (i.e. no physical interface, because I have no physical jumbo infrastructure) so the physical interface didn't force the bridge. > With this change, the vif interfaces follow the system configuration. ok, that's cool then. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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