[Rdo-list] R: R: Jumbo MTU to instances in Kilo?

Salvati Amedeo amedeo.salvati at fastweb.it
Fri Oct 9 12:24:39 UTC 2015


Erich you are welcome in the club :D 

One side note: as we have rhosp and not rdo, we asked to rh to document this and they wrote a solution on their kb:

https://access.redhat.com/solutions/1417133

Regards,
Amedeo

-----Messaggio originale-----
Da: Erich Weiler [mailto:weiler at soe.ucsc.edu] 
Inviato: giovedì 8 ottobre 2015 18:23
A: Salvati Amedeo; Pedro Navarro Perez
Cc: rdo-list at redhat.com
Oggetto: Re: R: [Rdo-list] Jumbo MTU to instances in Kilo?

Thanks Amedeo,

The bit about the config item in the l3_agent.ini file is new to me - I couldn't find that in the documentation, or even as a comment in the file as a config option.  If it is a config item as you point out, maybe it should have a commented section in l3_agent.ini?

Thanks for the insight!

cheers,
erich

On 10/08/2015 03:02 AM, Salvati Amedeo wrote:
> Eric,
>
> also, to set jumbo frames on your env, you have to set mtu from VM to controller:
>
>   # echo "dhcp-option-force=26,8900" > /etc/neutron/dnsmasq-neutron.conf
>   # openstack-config --set /etc/neutron/dhcp_agent.ini DEFAULT dnsmasq_config_file /etc/neutron/dnsmasq-neutron.conf
>   # openstack-config --set /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini agent veth_mtu 8900
>   # openstack-config --set /etc/neutron/l3_agent.ini DEFAULT network_device_mtu 9000
>   # openstack-config --set /etc/nova/nova.conf DEFAULT network_device_mtu 9000            <--- this on every nova-compute
>
> take a look at l3_agent.ini file, without network_device_mtu every new 
> router will use default mtu at 1500
>
> # ip netns exec qrouter-26f64a08-52ab-4643-b903-9aea6eae047a /bin/bash 
> # ip a | grep mtu
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
> 69: ha-89546945-ab: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
> noqueue state UNKNOWN
> 74: qr-f207f652-da: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
> noqueue state UNKNOWN
> 81: qg-ab978cd0-ad: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
> noqueue state UNKNOWN
>
> HTH
> Amedeo
>
> -----Messaggio originale-----
> Da: rdo-list-bounces at redhat.com [mailto:rdo-list-bounces at redhat.com] 
> Per conto di Erich Weiler
> Inviato: giovedì 8 ottobre 2015 01:53
> A: Pedro Navarro Perez
> Cc: rdo-list at redhat.com
> Oggetto: Re: [Rdo-list] Jumbo MTU to instances in Kilo?
>
> Actually I was wrong, it WAS on the network node.  The virtual router interfaces were not set to MTU=9000.  On network node:
>
> [root at os-net-01 ~]# ip netns
> qdhcp-c395cff9-af7b-4456-91e3-3c55e6c2c5f5
> qrouter-0b52e3a6-135c-4481-b286-7c96229f6555
>
> i[root at os-net-01 ~]# ip netns exec
> qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>           inet 127.0.0.1  netmask 255.0.0.0
>           inet6 ::1  prefixlen 128  scopeid 0x10<host>
>           loop  txqueuelen 0  (Local Loopback)
>           RX packets 0  bytes 0 (0.0 B)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 0  bytes 0 (0.0 B)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qg-fa1e2a28-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>           inet 10.50.100.1  netmask 255.255.0.0  broadcast 10.50.255.255
>           inet6 fe80::f816:3eff:fe6a:608b  prefixlen 64  scopeid 0x20<link>
>           ether fa:16:3e:6a:60:8b  txqueuelen 0  (Ethernet)
>           RX packets 34071065  bytes 5046408745 (4.6 GiB)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 442  bytes 51915 (50.6 KiB)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qr-51904c89-b8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>           inet 10.100.0.1  netmask 255.255.0.0  broadcast 10.100.255.255
>           inet6 fe80::f816:3eff:fe37:eca6  prefixlen 64  scopeid 0x20<link>
>           ether fa:16:3e:37:ec:a6  txqueuelen 0  (Ethernet)
>           RX packets 702  bytes 75369 (73.6 KiB)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 814  bytes 92259 (90.0 KiB)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> I can fix it manually:
>
> [root at os-net-01 neutron]# ip netns exec
> qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig qg-fa1e2a28-25 
> mtu
> 9000
> [root at os-net-01 neutron]# ip netns exec
> qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig qr-51904c89-b8 
> mtu
> 9000
> [root at os-net-01 neutron]# ip netns exec
> qrouter-0b52e3a6-135c-4481-b286-7c96229f6555 ifconfig
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>           inet 127.0.0.1  netmask 255.0.0.0
>           inet6 ::1  prefixlen 128  scopeid 0x10<host>
>           loop  txqueuelen 0  (Local Loopback)
>           RX packets 0  bytes 0 (0.0 B)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 0  bytes 0 (0.0 B)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qg-fa1e2a28-25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>           inet 10.50.100.1  netmask 255.255.0.0  broadcast 10.50.255.255
>           inet6 fe80::f816:3eff:fe6a:608b  prefixlen 64  scopeid 0x20<link>
>           ether fa:16:3e:6a:60:8b  txqueuelen 0  (Ethernet)
>           RX packets 34086053  bytes 5048637833 (4.7 GiB)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 442  bytes 51915 (50.6 KiB)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> qr-51904c89-b8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>           inet 10.100.0.1  netmask 255.255.0.0  broadcast 10.100.255.255
>           inet6 fe80::f816:3eff:fe37:eca6  prefixlen 64  scopeid 0x20<link>
>           ether fa:16:3e:37:ec:a6  txqueuelen 0  (Ethernet)
>           RX packets 702  bytes 75369 (73.6 KiB)
>           RX errors 0  dropped 0  overruns 0  frame 0
>           TX packets 814  bytes 92259 (90.0 KiB)
>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> And then I have a jumbo clean path everywhere!  All is good then.
> But...  How to set this in a config file or something so I don't have to do it manually?
>
> I found this bug report:
>
> https://bugs.launchpad.net/neutron/+bug/1311097
>
> Anyone know if that bug is still out there?  Or how can I set virtual router interfaces MTU by default when I create the router?
>
> cheers,
> erich
>
> On 10/07/2015 04:35 PM, Erich Weiler wrote:
>> Actually I think I'm closer - on the compute nodes, I set this in
>> nova.conf:
>>
>> network_device_mtu=9000
>>
>> even though there was a big note above it that said not to use it 
>> because this option was deprecated.  But after setting that option, 
>> and restarting nova and openvswitch, br-int, my tap device and my qvb 
>> device all got set to MTU=9000.  So I'm closer!  But still one item 
>> is blocking me.  I show this tracepath from my controller node direct 
>> to the VM (which is on a compute node on the local network):
>>
>> # tracepath 10.50.100.4
>>    1?: [LOCALHOST]                                         pmtu 9000
>>    1:  10.50.100.4                                           0.682ms
>>    1:  10.50.100.4                                           0.241ms
>>    2:  10.50.100.4                                           0.297ms pmtu
>> 1500
>>    2:  10.50.100.4                                           1.664ms reached
>>
>> 10.50.100.4 is the VM.  It looks like the path is jumbo clean up 
>> until that third hop.  But the thing is, I don't know what the third hop is.
>> ;)
>>
>> On my compute node I still see some stuff with MTU=1500, but I'm not 
>> sure if one of those is blocking me:
>>
>> # ifconfig
>> br-enp3s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>>           ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>           RX packets 2401498  bytes 359284253 (342.6 MiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 30  bytes 1572 (1.5 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::64dc:94ff:fe35:db4c  prefixlen 64  scopeid 0x20<link>
>>           ether 66:dc:94:35:db:4c  txqueuelen 0  (Ethernet)
>>           RX packets 133  bytes 12934 (12.6 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 8  bytes 648 (648.0 B)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> enp3s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 9000
>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>>           ether 0c:c4:7a:58:42:3e  txqueuelen 1000  (Ethernet)
>>           RX packets 165957142  bytes 20333410092 (18.9 GiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 23299881  bytes 5950708819 (5.5 GiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> enp3s0f0.50: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet 10.50.1.236  netmask 255.255.0.0  broadcast 10.50.255.255
>>           inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 0x20<link>
>>           ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>           RX packets 6014767  bytes 813880745 (776.1 MiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 79301  bytes 19052451 (18.1 MiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>>           inet 127.0.0.1  netmask 255.0.0.0
>>           inet6 ::1  prefixlen 128  scopeid 0x10<host>
>>           loop  txqueuelen 0  (Local Loopback)
>>           RX packets 22462729  bytes 1202484822 (1.1 GiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 22462729  bytes 1202484822 (1.1 GiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qbr922bd9f5-bb: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::4c1a:55ff:feba:14c3  prefixlen 64  scopeid 0x20<link>
>>           ether 56:a6:a6:db:83:c4  txqueuelen 0  (Ethernet)
>>           RX packets 16  bytes 1520 (1.4 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 8  bytes 648 (648.0 B)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qbrf42ea01f-fe: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>           inet6 fe80::f484:f1ff:fe53:fb2e  prefixlen 64  scopeid 0x20<link>
>>           ether c2:a6:d8:25:63:ea  txqueuelen 0  (Ethernet)
>>           RX packets 15  bytes 1456 (1.4 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 8  bytes 648 (648.0 B)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qvb922bd9f5-bb: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>> mtu
>> 9000
>>           inet6 fe80::54a6:a6ff:fedb:83c4  prefixlen 64  scopeid 0x20<link>
>>           ether 56:a6:a6:db:83:c4  txqueuelen 1000  (Ethernet)
>>           RX packets 86  bytes 9610 (9.3 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 133  bytes 12767 (12.4 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qvbf42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>> mtu
>> 1500
>>           inet6 fe80::c0a6:d8ff:fe25:63ea  prefixlen 64  scopeid 0x20<link>
>>           ether c2:a6:d8:25:63:ea  txqueuelen 1000  (Ethernet)
>>           RX packets 377  bytes 57664 (56.3 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 333  bytes 38765 (37.8 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qvo922bd9f5-bb: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>> mtu
>> 9000
>>           inet6 fe80::b44a:bff:fe72:aaea  prefixlen 64  scopeid 0x20<link>
>>           ether b6:4a:0b:72:aa:ea  txqueuelen 1000  (Ethernet)
>>           RX packets 133  bytes 12767 (12.4 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 86  bytes 9610 (9.3 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> qvof42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>> mtu
>> 1500
>>           inet6 fe80::f03e:35ff:fefe:e52  prefixlen 64  scopeid 0x20<link>
>>           ether f2:3e:35:fe:0e:52  txqueuelen 1000  (Ethernet)
>>           RX packets 333  bytes 38765 (37.8 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 377  bytes 57664 (56.3 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> tap922bd9f5-bb: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::fc16:3eff:fefa:9945  prefixlen 64  scopeid 0x20<link>
>>           ether fe:16:3e:fa:99:45  txqueuelen 500  (Ethernet)
>>           RX packets 118  bytes 11561 (11.2 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 95  bytes 10316 (10.0 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
>>           inet 192.168.122.1  netmask 255.255.255.0  broadcast
>> 192.168.122.255
>>           ether 52:54:00:c4:75:9f  txqueuelen 0  (Ethernet)
>>           RX packets 0  bytes 0 (0.0 B)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 0  bytes 0 (0.0 B)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> My network node has all interfaces set to MTU=9000.  I thought maybe the
>> bottleneck might be there but I don't think it is.   Here's ifconfig
>> from my network node:
>>
>> # ifconfig
>> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>>           inet 127.0.0.1  netmask 255.0.0.0
>>           inet6 ::1  prefixlen 128  scopeid 0x10<host>
>>           loop  txqueuelen 0  (Local Loopback)
>>           RX packets 2042  bytes 238727 (233.1 KiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 2042  bytes 238727 (233.1 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> p1p2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::207:43ff:fe10:deb8  prefixlen 64  scopeid 0x20<link>
>>           ether 00:07:43:10:de:b8  txqueuelen 1000  (Ethernet)
>>           RX packets 2156053308  bytes 325330839639 (302.9 GiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 223004  bytes 24769304 (23.6 MiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>           device interrupt 72
>>
>> p2p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet 10.50.1.51  netmask 255.255.0.0  broadcast 10.50.255.255
>>           inet6 fe80::260:ddff:fe44:2aea  prefixlen 64  scopeid 0x20<link>
>>           ether 00:60:dd:44:2a:ea  txqueuelen 1000  (Ethernet)
>>           RX packets 49352916  bytes 3501547231 (3.2 GiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 18876911  bytes 3768900461 (3.5 GiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> p2p2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>           inet6 fe80::260:ddff:fe44:2aeb  prefixlen 64  scopeid 0x20<link>
>>           ether 00:60:dd:44:2a:eb  txqueuelen 1000  (Ethernet)
>>           RX packets 2491224974  bytes 348058319500 (324.1 GiB)
>>           RX errors 0  dropped 0  overruns 0  frame 0
>>           TX packets 1597  bytes 204525 (199.7 KiB)
>>           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> Any way I can figure out what the third hop is from my tracepath?
>>
>> Thanks as always for the sage advice!
>>
>> -erich
>>
>> On 10/07/2015 09:57 AM, Erich Weiler wrote:
>>> Yeah, I made the changes and then recreated all the networks.  For 
>>> some reason br-int and the individual virtual instance interfaces on 
>>> the compute node still show 1500 byte frames.
>>>
>>> Has anyone else configured jumbo frames in a Kilo environment?  Or 
>>> maybe I'm just an outlier...  ;)
>>>
>>> -erich
>>>
>>> On 10/07/2015 01:46 AM, Pedro Navarro Perez wrote:
>>>> Hi Erich,
>>>>
>>>> did you recreate the neutron networks after the configuration changes?
>>>>
>>>> Pedro Navarro Pérez
>>>> OpenStack product specialist
>>>> Red Hat Iberia
>>>> Passeig de Gràcia 120,
>>>> 08008 Barcelona
>>>> Spain
>>>> M +34 639 642 379
>>>> E pnavarro at redhat.com
>>>>
>>>> ----- Original Message -----
>>>> From: "Erich Weiler" <weiler at soe.ucsc.edu>
>>>> To: rdo-list at redhat.com
>>>> Sent: Wednesday, 7 October, 2015 2:34:28 AM
>>>> Subject: [Rdo-list] Jumbo MTU to instances in Kilo?
>>>>
>>>> Hi Y'all,
>>>>
>>>> I know someone must have figured this one out, but I can't seem to 
>>>> get
>>>> 9000 byte MTUs working.  I have it set in plugin.ini, etc, my nodes 
>>>> have
>>>> MTU=9000 on their interfaces, so does the network node.  dnsmasq 
>>>> also is configured to set MTU=9000 on instances, which works.  But 
>>>> I still can't ping with large packets to my instance:
>>>>
>>>> [weiler at stacker ~]$ ping 10.50.100.2 PING 10.50.100.2 (10.50.100.2)
>>>> 56(84) bytes of data.
>>>> 64 bytes from 10.50.100.2: icmp_seq=1 ttl=63 time=2.95 ms
>>>> 64 bytes from 10.50.100.2: icmp_seq=2 ttl=63 time=1.14 ms
>>>> 64 bytes from 10.50.100.2: icmp_seq=3 ttl=63 time=0.661 ms
>>>>
>>>> That works fine.  This however doesn't work:
>>>>
>>>> [root at stacker ~]# ping -M do -s 8000 10.50.100.2 PING 10.50.100.2
>>>> (10.50.100.2) 8000(8028) bytes of data.
>>>>    From 10.50.100.2 icmp_seq=1 Frag needed and DF set (mtu = 1500)
>>>> ping: local error: Message too long, mtu=1500
>>>> ping: local error: Message too long, mtu=1500
>>>> ping: local error: Message too long, mtu=1500
>>>> ping: local error: Message too long, mtu=1500
>>>>
>>>> It looks like somehow the br-int interface for OVS isn't set at 
>>>> 9000, but I can't figure out how to do that...
>>>>
>>>> Here's ifconfig on my compute node:
>>>>
>>>> br-enp3s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>>>            inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>>>            RX packets 2401432  bytes 359276713 (342.6 MiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 30  bytes 1572 (1.5 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>>            inet6 fe80::64dc:94ff:fe35:db4c  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether 66:dc:94:35:db:4c  txqueuelen 0  (Ethernet)
>>>>            RX packets 69  bytes 6866 (6.7 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 8  bytes 648 (648.0 B)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> enp3s0f0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 9000
>>>>            inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether 0c:c4:7a:58:42:3e  txqueuelen 1000  (Ethernet)
>>>>            RX packets 130174458  bytes 15334807929 (14.2 GiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 22919305  bytes 5859090420 (5.4 GiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> enp3s0f0.50: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000
>>>>            inet 10.50.1.236  netmask 255.255.0.0  broadcast 10.50.255.255
>>>>            inet6 fe80::ec4:7aff:fe58:423e  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether 0c:c4:7a:58:42:3e  txqueuelen 0  (Ethernet)
>>>>            RX packets 38429352  bytes 5152853436 (4.7 GiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 419842  bytes 101161981 (96.4 MiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>>>>            inet 127.0.0.1  netmask 255.0.0.0
>>>>            inet6 ::1  prefixlen 128  scopeid 0x10<host>
>>>>            loop  txqueuelen 0  (Local Loopback)
>>>>            RX packets 22141566  bytes 1185622090 (1.1 GiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 22141566  bytes 1185622090 (1.1 GiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qbr247da3ed-a4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>>            inet6 fe80::5c8f:c0ff:fe79:bc11  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether b6:1f:54:3f:3d:48  txqueuelen 0  (Ethernet)
>>>>            RX packets 16  bytes 1472 (1.4 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 8  bytes 648 (648.0 B)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qbrf42ea01f-fe: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>>            inet6 fe80::f484:f1ff:fe53:fb2e  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether c2:a6:d8:25:63:ea  txqueuelen 0  (Ethernet)
>>>>            RX packets 15  bytes 1456 (1.4 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 8  bytes 648 (648.0 B)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qvb247da3ed-a4: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>>> mtu 1500
>>>>            inet6 fe80::b41f:54ff:fe3f:3d48  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether b6:1f:54:3f:3d:48  txqueuelen 1000  (Ethernet)
>>>>            RX packets 247  bytes 28323 (27.6 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 233  bytes 25355 (24.7 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qvbf42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>>> mtu 1500
>>>>            inet6 fe80::c0a6:d8ff:fe25:63ea  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether c2:a6:d8:25:63:ea  txqueuelen 1000  (Ethernet)
>>>>            RX packets 377  bytes 57664 (56.3 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 333  bytes 38765 (37.8 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qvo247da3ed-a4: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>>> mtu 1500
>>>>            inet6 fe80::dcfa:f1ff:fe03:ee88  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether de:fa:f1:03:ee:88  txqueuelen 1000  (Ethernet)
>>>>            RX packets 233  bytes 25355 (24.7 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 247  bytes 28323 (27.6 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> qvof42ea01f-fe: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>
>>>> mtu 1500
>>>>            inet6 fe80::f03e:35ff:fefe:e52  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether f2:3e:35:fe:0e:52  txqueuelen 1000  (Ethernet)
>>>>            RX packets 333  bytes 38765 (37.8 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 377  bytes 57664 (56.3 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> tap247da3ed-a4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>>            inet6 fe80::fc16:3eff:fede:5eea  prefixlen 64  scopeid 
>>>> 0x20<link>
>>>>            ether fe:16:3e:de:5e:ea  txqueuelen 500  (Ethernet)
>>>>            RX packets 219  bytes 24239 (23.6 KiB)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 224  bytes 26661 (26.0 KiB)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
>>>>            inet 192.168.122.1  netmask 255.255.255.0  broadcast
>>>> 192.168.122.255
>>>>            ether 52:54:00:c4:75:9f  txqueuelen 0  (Ethernet)
>>>>            RX packets 0  bytes 0 (0.0 B)
>>>>            RX errors 0  dropped 0  overruns 0  frame 0
>>>>            TX packets 0  bytes 0 (0.0 B)
>>>>            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 
>>>> 0
>>>>
>>>> This is on RHEL 7.1.  Any obvious way I can get all the 
>>>> intermediate bridges to MTU=9000?  I've RTFM'd and googled to no avail...
>>>>
>>>> Here's the ovs-vsctl outout:
>>>>
>>>> [root at node-136 ~]# ovs-vsctl show
>>>> 6f5a5f00-59e2-4420-aeaf-7ad464ead232
>>>>        Bridge br-int
>>>>            fail_mode: secure
>>>>            Port br-int
>>>>                Interface br-int
>>>>                    type: internal
>>>>            Port "qvo247da3ed-a4"
>>>>                tag: 1
>>>>                Interface "qvo247da3ed-a4"
>>>>            Port "int-br-eth1"
>>>>                Interface "int-br-eth1"
>>>>            Port "int-br-enp3s0f0"
>>>>                Interface "int-br-enp3s0f0"
>>>>                    type: patch
>>>>                    options: {peer="phy-br-enp3s0f0"}
>>>>        Bridge "br-enp3s0f0"
>>>>            Port "enp3s0f0"
>>>>                Interface "enp3s0f0"
>>>>            Port "br-enp3s0f0"
>>>>                Interface "br-enp3s0f0"
>>>>                    type: internal
>>>>            Port "phy-br-enp3s0f0"
>>>>                Interface "phy-br-enp3s0f0"
>>>>                    type: patch
>>>>                    options: {peer="int-br-enp3s0f0"}
>>>>        ovs_version: "2.3.1"
>>>>
>>>> Many thanks if anyone has any information on this topic!  Or can 
>>>> point me to some documentation I missed...
>>>>
>>>> Thanks,
>>>> erich
>>>>
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>>>>
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