On 03/20/2017 11:18 AM, O Mahony, Billy wrote: > 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. > Hi Billy,
I ran the iperf test on master and I see very different results than you got? mrg on/indirect off: 7.10 Gbps mrg off/indirect off: 5.05 Gbps mrg off/indirect on: 7.15 Gbps Kevin. >> >>> 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 > _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
