So It works if I manually configure the br-int MTUs:
#ovs-vsctl set interface vnet1 mtu_request=8900
#ovs-vsctl set interface vnet1 mtu=8900
#ovs-vsctl set interface vnet2 mtu_request=8900
#ovs-vsctl set interface vnet2 mtu=8900#ovs-vsctl get interface vnet2 mtu
8900
# ovs-vsctl get interface vnet1 mtu
8900
But I'm thinking that I should be able to modify the VM KVM XLM, to
specify an MTU for the openvswitch interface, something like:
<interface type='bridge'>
<mac address='00:13:97:b6:0f:3c'/>
<source bridge='br-int'/>
<virtualport type='openvswitch'>
<parameters interfaceid='e2ce9e04-25f3-11eb-9180-0010e0c3df92'/>
</virtualport>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
<mtu size='8900'/>
</interface>
Then hopefully the libvert plugin will configure the OVS bridge MTUs to 8900
Brendan
On 19/11/2020 10:53, Brendan Doyle wrote:
Folks,
I'm trying to get OVN working in a 9000 MTU config so :
ovn-nbctl list dhcp-option
_uuid : 00f684c8-42bb-4fad-a248-f5697926778d
cidr : "10.225.1.0/24"
external_ids : {}
options : {lease_time="3600", mtu="9000",
router="10.225.1.1", server_id="10.225.1.1",
server_mac="00:13:97:60:de:6a"}
The hypervisor phys interface MTU is 9000, so I know the above should
specify MTU of 8950 to account
for the geneve header, in any case I manually lower the MTU on the VM
node but things still don't work.
And I think the reason is that when I looked at the OVS br-int, I see
the OVN port MTU is 1500. How
do I get OVN to create the br-int port with a 9000/8950 MTU?
Is this something we have to manually configure on the OVS bridge?
ovs-vsctl list interface vnet1
_uuid : 49637687-3870-4eea-911a-e22c6c2ef19a
admin_state : up
bfd : {}
bfd_status : {}
cfm_fault : []
cfm_fault_status : []
cfm_flap_count : []
cfm_health : []
cfm_mpid : []
cfm_remote_mpids : []
cfm_remote_opstate : []
duplex : full
error : []
external_ids : {attached-mac="00:13:97:32:18:d6",
iface-id="dc5bca80-2948-11eb-96a2-0010e0c3df92", iface-status=active,
vm-id="11b14a04-59ed-45e9-9445-665b8847fba7"}
ifindex : 26
ingress_policing_burst: 0
ingress_policing_rate: 0
lacp_current : []
link_resets : 1
link_speed : 10000000
link_state : up
lldp : {}
mac : []
mac_in_use : "fe:13:97:32:18:d6"
mtu : 1500
mtu_request : []
name : "vnet1"
ofport : 13
ofport_request : []
options : {}
other_config : {}
statistics : {collisions=0, rx_bytes=88983, rx_crc_err=0,
rx_dropped=0, rx_errors=0, rx_frame_err=0, rx_over_err=0,
rx_packets=470, tx_bytes=33425, tx_dropped=0, tx_errors=0,
tx_packets=279}
status : {driver_name=tun, driver_version="1.6",
firmware_version=""}
type : ""
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