Hi Shiva, The echo client/server code was mainly built for tcp testing and was never made to properly work with udp (it does not support session worker migration). It did work with udpc (connected udp), but apparently that’s not currently selectable due to a transport protocol unformat bug fixed here [1].
Apart from that, some other observations regarding the echo clients test app: - it expects data to be delivered reliably by the transport, so if you ever try udpc in full-duplex mode (as you did lower with udp) and packets are dropped, the test will fail. To use half-duplex testing, add “no-echo” to the server cli and “no-return” to client cli. - if you aim to measure throughput, be sure to configure fifo-size to a larger value than the default of 64k. Note though that udp is currently not paced, so it can easily overwhelm the tx nic, thereby leading to tx-errors. Florin [1] https://gerrit.fd.io/r/c/vpp/+/23551 > On Nov 19, 2019, at 3:32 AM, Shiva Shankar <shivaashankar1...@gmail.com> > wrote: > > Hi All, > I am validating builtin echo sever client node functionality with UDP > protocol by running 2 VPP instances on 2 different hosts. > > On VPP1, running echo server with the test command "echo server uri udp: > //1.2.3.4 <http://1.2.3.4/> /9999 <http://1.2.3.4/9999>" > On VPP2, running echo client with the test command "test echo client nclients > 1 gbytes 10 test-timeout 10 uri udp://1.2.3.4/9999 <http://1.2.3.4/9999>" > > On the server-side, packets are received without any issue. However, while > echoing back from the server app RX callback, VPP is not sending packets out. > Looks like we are running out of RX buffers because of TX events not > processed by session node. > > Error case logs: > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > 1: echo_server_rx_callback:287: short trout! written 0 read 82 > > If I "manually place" session-queue node on the main thread (thread 0) things > are working normally. Also, This issue is not seen if the protocol is TCP. > > Am I missing something obvious? > > -Shiva
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