On 03/17/2017 10:48 AM, Maxime Coquelin wrote:
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/sThis is indeed a big gain. However, isn't there a problem when indirect descriptors are disabled? 0.05 Gbits/s is very low, no? Could you share the iperf3 command line you used?
And is Rx mergeable feature enabled in this setup?
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? Regards, Maxime
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