I mean OpenFlow flows that are persistent across OVS or system restarts. -----Original Message----- From: Ben Pfaff [mailto:[email protected]] Sent: Monday, May 7, 2018 9:18 PM To: [email protected] Cc: [email protected] Subject: Re: [ovs-discuss] Multiple dpdk-netdev datapath with OVS 2.9
What do you mean by "persist the OVS flows"? I have a couple of guesses but I'd like to hear from you. On Mon, May 07, 2018 at 02:17:18AM +0500, [email protected] wrote: > Thank you Ben for the correction. I am running tests with different > scenarios to better understand what's happening inside the OVS-DPDK. > One thing that I would like to ask is, is there a way to persist the OVS flows? > Can OVN help me do that? I don't have any virtual networks, just in > and out ports. > > -----Original Message----- > From: Ben Pfaff [mailto:[email protected]] > Sent: Friday, May 4, 2018 11:29 AM > To: [email protected] > Cc: [email protected] > Subject: Re: [ovs-discuss] Multiple dpdk-netdev datapath with OVS 2.9 > > It's mostly for historical reasons. > > We do try to document in ovs-vswitchd(8) that the user should not > manage datapaths themselves: > > ovs-vswitchd does all the necessary management of Open vSwitch > datapaths itself. Thus, external tools, such ovs-dpctl(8), are > not needed for managing datapaths in conjunction with > ovs-vswitchd, and their use to modify datapaths when ovs-vswitchd > is running can interfere with its operation. (ovs-dpctl may > still be useful for diagnostics.) > > I guess that the wording should be updated to reflect the "ovs-appctl" > interface too. > > I sent a patch to improve the docs here: > https://patchwork.ozlabs.org/patch/908532/ > > On Thu, May 03, 2018 at 06:44:43PM +0500, [email protected] > wrote: > > If "ovs-vswitchd" manages the data paths, why does it have a utility > > that lets me create more of them. And when I create them I cannot > > use them. I am stuck in a loop :) . > > > > -----Original Message----- > > From: Ben Pfaff [mailto:[email protected]] > > Sent: Thursday, May 3, 2018 4:41 PM > > To: [email protected] > > Cc: [email protected] > > Subject: Re: [ovs-discuss] Multiple dpdk-netdev datapath with OVS > > 2.9 > > > > 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
