On Wed, May 02, 2018 at 10:02:04PM +0500, [email protected] wrote: > I am trying to create multiple dpdk-netdev based data paths with OVS 2.9 and > DPDK 16.11 running on CentOS 7.4. I am able to create multiple data paths > using "ovs-appctl dpctl/add-dp netdev@netdev1" and I can see a new data path > created with "ovs-appctl dpctl/show". However I cannot add any interfaces > (dpdk or otherwise), and I cannot set this data path as datapath_type to any > bridge.
That's not useful or a good idea. ovs-vswitchd manages datapaths itself. Adding and removing them yourself will not help. > Just a precap to why I am trying to do this, I am working with a lot of OVS > OpenFlow rules (around 0.5 million) matching layer 3 and layer 4 fields. The > incoming traffic is more than 40G (4 x10G Intel x520s), and has multiple > parallel flows (over a million IPs). With this the OVS performance decreases > and each port is forwarding only around 250 Mb/s. I am using multiple RX > queues (4-6), with single RX queue it drops to 70 Mb/s. Now if I shutdown > three 10G interfaces, an interesting thing happen, and OVS starts forwarding > over 7Gb/s for that single interface. That got me thinking, maybe the reason > for low performance is 40 G traffic hitting a single bridges flow tables, > how about creating multiple bridges with multiple flow tables. With this > setup the situation remained same, and now the only common thing between the > 4 interfaces is the data path. They are not sharing anything else. They are > polled by dedicated vCPUs, and they are in different tables. > > > > Can anyone explain this bizarre scenario of why the OVS is able to forward > more traffic over single interface polled by 6 vCPUs, compared to 4 > interfaces polled by 24 vCPUs. > > Also is there a way to create multiple data paths and remove this dependency > also. You can create multiple bridges with "ovs-vsctl add-br". OVS doesn't use multiple datapaths. Maybe someone who understands the DPDK port better can suggest some reason for the performance characteristics that you see. _______________________________________________ discuss mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
