> 2021年6月4日 下午11:21，Ben Pfaff 写道：
>
> On Fri, Jun 04, 2021 at 02:11:23PM +0800, Harry Lee wrote:
>> Hello,
>>
>> My server is running debian testing. I install two ovs version through apt:
>>
>> ```
>> openvswitch-switch/testing,unstable,now 2.15.0+ds1-2 amd64 [installed]
>> Open vSwitch switch implementations
>>
>> openvswitch-switch-dpdk/testing,unstable,now 2.15.0+ds1-2 amd64 [installed]
>> DPDK enabled Open vSwitch switch implementation
>> ```
>>
>> Then I found something difference between them.
>>
>> Here's my experience:
>>
>> ```
>> # switch ovs version to ovs-vswitchd
>> update-alternatives --set ovs-vswitchd
>> /usr/lib/openvswitch-common/ovs-vswitchd
>> /etc/init.d/openvswitch-switch restart
>> ip addr add 10.90.67.148/25 dev br0
>> ping 10.90.67.129 # network is ok
>>
>> # switch ovs version to ovs-vswitchd-dpdk
>> update-alternatives --set ovs-vswitchd
>> /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
>> /etc/init.d/openvswitch-switch restart
>> ip addr add 10.90.67.148/25 dev br0
>> ping 10.90.67.129 # unreachable
>> ```
>>
>> The same configuration, using ovs-vswitchd was reachable while using
>> ovs-vswitchd-dpdk was unreachable.
>>
>> Then I used `tcpdump br0` to checkout if there are packets from br0, and I
>> found some ARP packets:
>>
>> ```
>> root@debian:~# tcpdump -i br0 -nnn
>> tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
>> listening on br0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
>> 02:14:27.010265 ARP, Request who-has 10.90.67.129 tell 10.90.67.148, length
>> 28
>> 02:14:28.034127 ARP, Request who-has 10.90.67.129 tell 10.90.67.148, length
>> 28
>> 02:14:29.058128 ARP, Request who-has 10.90.67.129 tell 10.90.67.148, length
>> 28
>> ```
>>
>> But when I ran `ovs-ofctl dump-flows br0`, I saw n_packets is 0:
>>
>> ```
>> root@debian:~# ovs-ofctl dump-flows br0
>> cookie=0x0, duration=1016.243s, table=0, n_packets=0, n_bytes=0, priority=0
>> actions=NORMAL
>> ```
>>
>> Why does ovs-vswitchd-dpdk ignore the packet from br0? Does it need
>> additional configuration?
>
> Did you configure the dpdk version to use DPDK devices and the userspace
> datapath? If you didn't, then these two versions of OVS were using the
> same code in the same way, so it's puzzling why there would have been
> any difference.
Did you mean `ovs-vsctl --no-wait set Open_vSwitch .
other_config:dpdk-init=false` ?
I had set it to false and restart, but no matter I set it true or set it false,
the results were the same.
By the way, I found some warning in log:
```
2021-06-07T10:36:26.790Z|1|vlog|INFO|opened log file
/var/log/openvswitch/ovs-vswitchd.log
2021-06-07T10:36:26.794Z|2|ovs_numa|INFO|Discovered 20 CPU cores on NUMA
node 0
2021-06-07T10:36:26.795Z|3|ovs_numa|INFO|Discovered 20 CPU cores on NUMA
node 1
2021-06-07T10:36:26.795Z|4|ovs_numa|INFO|Discovered 2 NUMA nodes and 40 CPU
cores
2021-06-07T10:36:26.795Z|5|reconnect|INFO|unix:/var/run/openvswitch/db.sock:
connecting...
2021-06-07T10:36:26.795Z|6|reconnect|INFO|unix:/var/run/openvswitch/db.sock:
connected
2021-06-07T10:36:26.799Z|7|bridge|INFO|ovs-vswitchd (Open vSwitch) 2.15.0
2021-06-07T10:36:26.801Z|8|dpdk|INFO|DPDK Disabled - Use
other_config:dpdk-init to enable
2021-06-07T10:36:26.830Z|9|ofproto_dpif|INFO|system@ovs-system: Datapath
supports recirculation
2021-06-07T10:36:26.830Z|00010|ofproto_dpif|INFO|system@ovs-system: VLAN header
stack length probed as 2
2021-06-07T10:36:26.830Z|00011|ofproto_dpif|INFO|system@ovs-system: MPLS label
stack length probed as 3
2021-06-07T10:36:26.830Z|00012|ofproto_dpif|INFO|system@ovs-system: Datapath
supports truncate action
2021-06-07T10:36:26.830Z|00013|ofproto_dpif|INFO|system@ovs-system: Datapath
supports unique flow ids
2021-06-07T10:36:26.830Z|00014|ofproto_dpif|INFO|system@ovs-system: Datapath
supports clone action
2021-06-07T10:36:26.831Z|00015|ofproto_dpif|INFO|system@ovs-system: Max sample
nesting level probed as 10
2021-06-07T10:36:26.831Z|00016|ofproto_dpif|INFO|system@ovs-system: Datapath
supports eventmask in conntrack action
2021-06-07T10:36:26.831Z|00017|ofproto_dpif|INFO|system@ovs-system: Datapath
supports ct_clear action
2021-06-07T10:36:26.831Z|00018|ofproto_dpif|INFO|system@ovs-system: Max dp_hash
algorithm probed to be 0
2021-06-07T10:36:26.831Z|00019|ofproto_dpif|INFO|system@ovs-system: Datapath
supports check_pkt_len action
2021-06-07T10:36:26.831Z|00020|ofproto_dpif|INFO|system@ovs-system: Datapath
supports timeout policy in conntrack action
2021-06-07T10:36:26.831Z|00021|ofproto_dpif|INFO|system@ovs-system: Datapath
supports ct_state
2021-06-07T10:36:26.831Z|00022|ofproto_dpif|INFO|system@ovs-system: Datapath
supports ct_zone
2021-06-07T10:36:26.831Z|00023|ofproto_dpif|INFO|system@ovs-system: Datapath
supports ct_mark
2021-06-07T10:36:26.831Z|00024|ofproto_dpif|INFO|system@ovs-system: Datapath
supports ct_label
