Hi, with the branch-2.5 ovs and n-dpdk-rxqs option i was able to get four queues with four pmd host threads, which currently is my limit for vm queues in terms of usable cores and the command itself.
To my understanding, with ovs post 2.5 (latest git master) i should be able to use two n-dpdk-rxqs queues for the host and use ovs-vsctl set Interface vhost-user-0 options:n_rxq=8 to get eight queues inside the vm, is this correct? If so, im experiencing a problem were only two queues out of the eight are used for traffic. Best regards Felix -----Ursprüngliche Nachricht----- Von: discuss [mailto:discuss-boun...@openvswitch.org] Im Auftrag von Felix Brucker Gesendet: Dienstag, 5. April 2016 09:48 An: Loftus, Ciara <ciara.lof...@intel.com>; Christian Ehrhardt <christian.ehrha...@canonical.com> Cc: Daniele Di Proietto <diproiet...@vmware.com>; discuss@openvswitch.org Betreff: [MASSMAIL] Re: [ovs-discuss] [OVS-DPDK] vhost-user with multiple queues does not work Hi Ciara, thanks that clarified it, i got confused by > Also this does NOT set the multiqueues the guest shall get i read the Install md from here http://openvswitch.org/support/dist-docs/INSTALL.DPDK.md.txt i thought this is related to the download on the same site (http://openvswitch.org/releases/openvswitch-2.5.0.tar.gz), but it seems not to. With the n-dpdk-rxqs=2 option i was able to get 2 queues inside the vm and working communication, too. After testing i will try to get the latest (post 2.5) version of ovs to get a more fine grained control over the queues. Thanks all! Best regards Felix -----Ursprüngliche Nachricht----- Von: Loftus, Ciara [mailto:ciara.lof...@intel.com] Gesendet: Montag, 4. April 2016 18:11 An: Felix Brucker <fbruc...@xantaro.net>; Christian Ehrhardt <christian.ehrha...@canonical.com> Cc: Daniele Di Proietto <diproiet...@vmware.com>; discuss@openvswitch.org Betreff: RE: [ovs-discuss] [OVS-DPDK] vhost-user with multiple queues does not work > yes that part works, but for communication to work between the guest > and host OVS has to use 2 queues as well, which currently does not work. > So how does one set multiple queues for vhostuser in OVS 2.5.0 or below? > Im not talking about libvirt or qemu regarding the above question, but OVS. Hi Felix, As we've mentioned before, you need to use the following command: ovs-vsctl set Open_vSwitch . other_config:n-dpdk-rxqs=2 ... to assign two rx queues to the vhost-user ports in OVS. This is clearly stated in INSTALL.DPDK.md on the 2.5 branch. I suspect you were previously looking at the latest INSTALL guide which pointed you to use the n_rxq option, which is not available on the older branch-2.5. Essentially, if your bridge has two vhost-user ports eg. vhost-user-0 and vhost-user-1, the effect of ' ovs-vsctl set Open_vSwitch . other_config:n-dpdk-rxqs=2' is the same as ovs-vsctl set Interface vhost-user-0 options:n_rxq=2 ovs-vsctl set Interface vhost-user-1 options:n_rxq=2 On branch-2.5, you need to use the former command. Thanks, Ciara > > Grüße > Felix > > Von: Christian Ehrhardt [mailto:christian.ehrha...@canonical.com] > Gesendet: Montag, 4. April 2016 17:35 > An: Felix Brucker <fbruc...@xantaro.net> > Cc: Daniele Di Proietto <diproiet...@vmware.com>; Loftus, Ciara > <ciara.lof...@intel.com>; discuss@openvswitch.org > Betreff: Re: [ovs-discuss] [OVS-DPDK] vhost-user with multiple queues > does not work > > Hi Felix, > here you already do the right thing: > > <interface type='vhostuser'> > [...] > <driver queues='2'/> > > Given you have the recent libvirt and qemu versions that translates to > the right qemu parameters as you have seen in my initial posts. > > You can then log into the guest and check with "ethtool -l" if the > guest really "sees" its multiple queues (also shown in my first mail > that this fails for me) > > Kind Regards, > Christian _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
