For optimal 10GbE performance, the following are added to the file /etc/sysctl.conf on clients running Linux or macOS 10.9 and greater when the Use optimized network settings checkbox is selected upon driver installation:
net.inet.tcp.recvspace system control values determine the client OS transmit and receive buffer sizes.
net.inet.tcp.delayed_ack system control determines when TCP delayed acknowledgment is enabled. The system control is changed from the default value of
0 (no delayed acks) to
Jumbo frames support for the ATTO Technology FastFrame and ThunderLink 10GbE network adapter is enabled using the Mac OS X network preferences pane.