Use native transport

[wsargent]

Transport is currently set to "jdk":

https://github.com/tenorviol/play-c100k-test/blob/master/conf/application.conf#L58

You could get some extra performance by using the "native" transport on linux:

https://www.playframework.com/documentation/2.5.x/SettingsNetty#Configuring-transport-socket

The settings page is a little vague, but try setting TCP_FASTOPEN if that's an option (was only added in 4.0.32 so may not be mapped to Play internally). There's a TCP Tuning for HTTP guide that may be helpful: https://tools.ietf.org/html/draft-stenberg-httpbis-tcp-03