Hi, Can you tell me how to enable the mergeable feature in ovs?
BR 2015-07-17 11:04 GMT+08:00 Ouyang, Changchun <changchun.ouy...@intel.com>: > > > On 7/16/2015 9:45 PM, Traynor, Kevin wrote: > > (re-adding the ovs-discuss list) > > > > This might be better on the dpdk dev mailing list. For the OVS part, see > this thread http://openvswitch.org/pipermail/discuss/2015-July/018095.html > > > > Kevin. > > > > *From:* Na Zhu [mailto:zhunat...@gmail.com <zhunat...@gmail.com>] > *Sent:* Wednesday, July 15, 2015 6:16 AM > *To:* Traynor, Kevin > *Subject:* Re: [ovs-discuss] ovs-dpdk performance is not good > > > > Hi Kevin, > > > > The interface MTU is 1500, the TCP message size is 16384 and the UDP > message size is 65507. > > How to use DPDK virtio PMD? > > in DPDK virtio PMD, it uses mergeable feature to support jumbo frame, > the mergeable feature need negotiate with vhost on the backend, > so if ovs enable the mergeable feature, and virtio can succeed in > negotiating this feature, > then jumbo frame can be supported. > > thanks > Changchun > > > > 2015-07-14 20:25 GMT+08:00 Traynor, Kevin <kevin.tray...@intel.com>: > > > > *From:* discuss [mailto:discuss-boun...@openvswitch.org] *On Behalf Of *Na > Zhu > *Sent:* Monday, July 13, 2015 3:15 AM > *To:* b...@openvswitch.org > *Subject:* [ovs-discuss] ovs-dpdk performance is not good > > > > Dear all, > > > > I want to use ovs-dpdk to improve my nfv performance. But when i compare > the throughput between standard ovs and ovs-dpdk, the ovs is better, does > anyone know why? > > > > I use netperf to test the throughput. > > use vhost-net to test standard ovs. > > use vhost-user to test ovs-dpdk. > > My topology is as follow: > > > > [image: 内嵌图片 1] > > > > The result is that standard ovs performance is better. Throughput unit > Mbps. > > [image: 内嵌图片 2] > > > > [image: 内嵌图片 3] > > > > > > [kt] I would check your core affinitization to ensure that the vswitchd > > pmd is on a separate core to the vCPUs (set with > other_config:pmd-cpu-mask). > > Also, this test is not using the DPDK vitrio PMD in the guest which > provides > > performance gains. > > > > What packet sizes are you using? you should see a greater gain from DPDK > > at lower packet sizes (i.e. more PPS) > > > > > > > > >
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