There is same problem by using ovs-dpdk Maybe that is because recv of VM is poor,so no free tx?descriptors,ovs-dpdk drop the pkts********************RTFSC*********************------------------------------------------------------------------????Zhou, Tianlin <tianlin.zhou at tekcomms.com>?????2015?6?5?(???) 17:23????dev at dpdk.org <dev at dpdk.org>????[dpdk-dev] Poor Virtio PMD TX PerformanceHi?there,We?tested?TX?performance?of?Virtio?PMD?by?DPDK?l2fwd,?but?found?even?at?60KPPS?(720B?packet?length)?TX?rate,?there?is?1/1000?packet?dropping?rate.The?log?shows?"No?free?tx?descriptors?to?transmit"?in?Virtio?PMD.Increasing?TX?queues?by?modifying?DPDK?l2fwd?can?decreases?packet?dropping?rate,?but?can't?ensure?no?packet?dropping?unless?retransmitting?packets?that?can't?be?sent?successfully.Oppositely,?RX?rate?can?be?600KPPS?without?packet?dropping.Test?Env-?Host?CPU:?4?cores,?2127.770MHz-?Host?Memory:?8G-?Host?OS:?Linux?dw-2?3.13.0-24-generic?#46-Ubuntu?SMP?Thu?Apr?10?19:11:08?UTC?2014?x86_64?x86_64?x86_64?GNU/Linux-?Guest?CPU:?4?cores,?2127.770MHz-?Guest?Memory:?4G-?Guest?OS:?fedora20Anybody?here?face?the?same?problem?-Tianlin
