seastar tcpserver - goclient rxrx test with DPDK at times underperforms by x1000

[slivne]

http://jenkins.cloudius-systems.com:8080/job/seastar-private-tcpserver-perf/8/PerfPublisher/

this happens at least 1 out of 5 runs

On Thor-Loki:

Goserver	tcp-server stack-native-dpdk171	tcpserver stack-native-dpdk18	tcpserver stack-posix
8.919001802	982.790393248	1034.080868611	9.70277449

values are seconds to complete the tests - lower is better

To reproduce you can tun the tests in the following manner:

• install + configure dpdk
• start tcpserver
• clone tests.git
• cd tests
• scripts/tester.py run --config_param sut.ip: --config_param tester.ip:x apps/tcp/tests/test_1_goclient/tester
• check the output at apps/tcp/tests/test_1_goclient/tester/out

or

• install + configure dpdk
• start tcpserver
• clone tests.git
• cd tests/apps/tcp/tests/test_1_goclient/tester
• go run client.go -h

Please note you can use client.go -conn 1 option to limit the number of connections

[asias]

What is the result when this does not happen for dpdk?

[slivne]

rxrx test is close to go/posix performance

as a sample

http://jenkins.cloudius-systems.com:8080/job/seastar-tcpserver-perf/24/PerfPublisher/

[asias]

@slivne Jenkins result suggestions we can close this issue as well.