Hi Maxime, > -----Original Message----- > From: Maxime Coquelin [mailto:maxime.coque...@redhat.com] > Sent: Friday, March 17, 2017 9:48 AM > To: O Mahony, Billy <billy.o.mah...@intel.com>; d...@openvswitch.org > Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: Enable INDIRECT_DESC on > DPDK vHostUser. > > Hi Billy, > > On 03/01/2017 01:36 PM, Billy O'Mahony wrote: > > Hi All, > > > > I'm creating this patch on the basis of performance results outlined > > below. In summary it appears that enabling INDIRECT_DESC on DPDK > > vHostUser ports leads to very large increase in performance when using > > linux stack applications in the guest with no noticable performance > > drop for DPDK based applications in the guest. > > > > Test#1 (VM-VM iperf3 performance) > > VMs use DPDK vhostuser ports > > OVS bridge is configured for normal action. > > OVS version 603381a (on 2.7.0 branch but before release, > > also seen on v2.6.0 and v2.6.1) > > DPDK v16.11 > > QEMU v2.5.0 (also seen with v2.7.1) > > > > Results: > > INDIRECT_DESC enabled 5.30 Gbit/s > > INDIRECT_DESC disabled 0.05 Gbit/s > This is indeed a big gain. > However, isn't there a problem when indirect descriptors are disabled? > 0.05 Gbits/s is very low, no?
[[BO'M]] Yes the disabling of the indirect descriptors feature appears to be what causes the very low test result. And the root cause may actually be related to this bug https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1668829 . However, turning on the indirect descriptors certainly helps greatly. > > Could you share the iperf3 command line you used? [[BO'M]] In the server VM "iperf3 -s" and in the client "iperf3 -c <server ip addr> -t 30". -t 30 is the duration (secs) of the test. OVS-DPDK bridge was set to use normal action. > > > Test#2 (Phy-VM-Phy RFC2544 Throughput) DPDK PMDs are polling NIC, > > DPDK loopback app running in guest. > > OVS bridge is configured with port forwarding to VM (via dpdkvhostuser > ports). > > OVS version 603381a (on 2.7.0 branch but before release), > > other versions not tested. > > DPDK v16.11 > > QEMU v2.5.0 (also seen with v2.7.1) > > > > Results: > > INDIRECT_DESC enabled 2.75 Mpps @64B pkts (0.176 Gbit/s) > > INDIRECT_DESC disabled 2.75 Mpps @64B pkts (0.176 Gbit/s) > > Is this with 0% packet loss? [[BO'M]] Yes. To an accuracy of .05 Mpps. > > Regards, > Maxime _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
