On Fri, Apr 15, 2011 at 07:28:00AM -0400, Digimer wrote:
> On 04/15/2011 06:12 AM, Pasi Kärkkäinen wrote:
> > On Wed, Apr 13, 2011 at 07:33:49AM -0400, Digimer wrote:
> >> Hi all,
> >>
> >> I've got Xen 3.0 (stock as available on CentOS 5.6). I'm trying to use
> >> jumbo frames, but when Xen creates vifX.Y interfaces, it uses 1500. This
> >> brings the xenbrX bridges down to 1500, and effectively messes up
> >> anything thinking that it can use the larger packet size.
> >>
> >> So how can I make sure that all vifX.Y interfaces created by Xen are
> >> set to a given MTU? I've grepped the files under /etc/xen, but haven't
> >> seen a specific place to set it.
> >>
> >> Thanks!
> >>
> >
> > I think first I'd try to modify vif-bridge script and make sure
> > MTU of the vif is adjusted before attaching to the bridge.
> >
> > Verify you get that working, and then let's figure out what's the best way..
> >
> > -- Pasi
>
> This fails. I tried adding to 'vif-bridge':
>
> ====
> case "$command" in
> online)
> setup_bridge_port "$vif"
> ifconfig $vif mtu 9000
Try doing it before setup_bridge_port ?
Do you need to specify a patch for ifconfig?
> add_to_bridge "$bridge" "$vif"
> ;;
> ====
>
> Alternatively, I tried adding to 'xen-network-common.sh':
>
> ====
> add_to_bridge () {
> local bridge=$1
> local dev=$2
>
> # Don't add $dev to $bridge if it's already on a bridge.
> if [ -e "/sys/class/net/${bridge}/brif/${dev}" ]; then
> ip link set ${dev} up || true
> return
> fi
> ifconfig ${dev} mtu 9000
> brctl addif ${bridge} ${dev}
> ip link set ${dev} up
> }
> ====
>
> Both cases caused the start of the domU to fail, complaining that the
> scripts failed.
>
Well something goes wrong then..
> http://pastebin.com/xstkgYzx
>
-- Pasi
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