Re: [Xen-users] Changing MTU of vif

["Phillip Bennett" <phillip@xxxxxxx>]

I would put a line somewhere in your startup (after the network is up) to 
set the MTU.  It can be done on the command line using the ifconfig command.
I haven't done this myself, but it seems like it should be fairly 
straightforward.
BTW, which AoE unit are you using (presuming it's Coraid)?  Is it the 15xx 
series, or the 16xx series?  I'm looking at buying one this week and would 
be very interested in how it performs in this type of setup.
<offtopic slightly>
I'm looking at buying a new server and passing the AoE functions through to 
one or more DomU's via exported ethernet interfaces (I will have 6 or so) 
If it's not feasable, I would love to know BEFORE I buy it. :)
</offtopic slightly>

Hth,
Phil.


----- Original Message ----- 
From: "Tracy R Reed" <treed@xxxxxxxxxxxxxxx>
To: <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, March 25, 2008 7:05 AM
Subject: [Xen-users] Changing MTU of vif


> Anyone know how I can automatically set the MTU on a vif when I create the 
> domain? I am using AoE to provide a SAN for my virtual machines and I 
> create a bridge called stbr0 which I connect to eth1 in my domU. I want it 
> to have an mtu of 9000 for performance reasons.
> I am using CentOS 5 and I see that the default vif creation script is 
> vif-bridge. I have tried changing vif-bridge like so:
> case "$command" in
>     online)
>         setup_bridge_port "$vif"
>         add_to_bridge "$bridge" "$vif"
>         if [ ${bridge} = "stbr0" ]; then
>                 ip link set ${dev} mtu 9000
>         fi
>
> so if the bridge we are adding the vif to is stbr0 then we set the mtu to 
> 9000. But this causes the xm create command to hang and I'm not sure why.
> Any suggestions on how to get a vif set up with an mtu of 9000? It doesn't 
> seem that I can just say mtu= in the vif= line in my domain config file.
> --
> Tracy R Reed                  Read my blog at http://ultraviolet.org
> Key fingerprint = D4A8 4860 535C ABF8 BA97  25A6 F4F2 1829 9615 02AD
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