> sudo /sbin/sysctl -w net.core.somaxconn=256
This is the same setting described above for Mac OSX.
> sudo /sbin/sysctl -w net.core.netdev_max_backlog=3000
The net.core.netdev_max_backlog controls the size of the incoming packet queue for upper-layer (java) processing.
This setting has allowed the developers to properly address various performance testing aspects of jetty-client, however, this isn't the only mechanism for tweaking congestion on a Linux environment.