Hi,
I have a server which has an ovs bridge with a dpdk device attached
for external network access and a network namespace attached via a tap
device. Sending data out of the namespace fails if jumbo frames are enabled.
Sending data into the namespace seems ok. Dropping the mtu of the tap
device
in the network namespace to 1500 also seems to fix the issue.
I initially came across the issue in an OpenStack deployment and raised
Bug #1833713 *1. However, I was able to reproduce the issue without
OpenStack by manually creating the bridge etc *2.
Any advice, tips or you-missed-this-step very gratefully received,
Liam
Below is my setup:
Ubuntu: eoan
DPDK pkg: 18.11.1-3
OVS DPDK pkg: 2.11.0-0ubuntu2
Kerenl: 5.0.0-20-generic
root@node-licetus:~# ovs-vsctl show
523eab62-8d03-4445-a7ba-7570f5027ff6
Bridge br-test
Port "tap1"
Interface "tap1"
type: internal
Port br-test
Interface br-test
type: internal
Port "dpdk-nic1"
Interface "dpdk-nic1"
type: dpdk
options: {dpdk-devargs="0000:03:00.0"}
ovs_version: "2.11.0"
root@node-licetus:~# ovs-vsctl get Interface dpdk-nic1 mtu
9000
root@node-licetus:~# ip netns exec ns1 ip addr show tap1
12: tap1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 9000 qdisc fq_codel
state UNKNOWN group default qlen 1000
link/ether 0a:dd:76:38:52:54 brd ff:ff:ff:ff:ff:ff
inet 10.246.112.101/21 scope global tap1
valid_lft forever preferred_lft forever
inet6 fe80::8dd:76ff:fe38:5254/64 scope link
valid_lft forever preferred_lft forever
Using iperf to send data out of the netns fails:
root@node-licetus:~# ip netns exec ns1 iperf -c 10.246.114.29
------------------------------------------------------------
Client connecting to 10.246.114.29, TCP port 5001
TCP window size: 325 KByte (default)
------------------------------------------------------------
[ 3] local 10.246.112.101 port 51590 connected with 10.246.114.29 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.3 sec 323 KBytes 257 Kbits/sec
root@node-hippalus:~# iperf -s -m
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
root@node-hippalus:~#
*1 https://bugs.launchpad.net/ubuntu/+source/dpdk/+bug/1833713
*2 https://bugs.launchpad.net/ubuntu/+source/dpdk/+bug/1833713/comments/7
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