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** Changed in: nova
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1250332
Title:
How to enable jumbo frames for
nova.virt.libvirt.vif.LibvirtHybridOVSBridgeDriver
Status in OpenStack Compute (Nova):
Invalid
Bug description:
Hi list,
I'm working under CentOS 6.4 + Havana.
I'm trying to enable jumbo frames for Openstack instances.
I'm using
libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtHybridOVSBridgeDriver
in nova.conf
I noticed there is a parameter in plugins/openvswitch/ovs_neutron_plugin.ini
I can use, so I set it to:
veth_mtu = 9000
And, it works fine :
ip link |grep 9000
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP
qlen 1000
263: phy-br-eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc
pfifo_fast state UP qlen 1000
264: int-br-eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc
pfifo_fast state UP qlen 1000
10: br-eth4: <BROADCAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state
UNKNOWN
But, after the instance booted, all ports used for the instance are still
MTU=1500:
ip link |grep df6a018a-0d
273: qbrdf6a018a-0d: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UNKNOWN
274: qvodf6a018a-0d: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu
1500 qdisc pfifo_fast state UP qlen 1000
275: qvbdf6a018a-0d: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu
1500 qdisc pfifo_fast state UP qlen 1000
276: tapdf6a018a-0d: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast state UNKNOWN qlen 500
So I have to
1. find the exact ports using by the instance
2. change there MTU one by one
3. login to the instance to change the MTU
Is there're way that can make sure after the instance booted, all
ports have MTU=9000 ??
Thanks.
-chen
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