What does "Use optimized network settings" in ATTO XtendSAN do?


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.sendspace=1048576
net.inet.tcp.recvspace=1048576
net.inet.tcp.delayed_ack=3
net.inet.tcp.rfc1323=1


The net.inet.tcp.sendspace and net.inet.tcp.recvspace system control values determine the client OS transmit and receive buffer sizes.


The 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 3 (autodetect).
Jumbo frames support for the ATTO Technology FastFrame and ThunderLink 10GbE network adapter is enabled using the Mac OS X network preferences pane.

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