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Host Tuning

Here you will find information on how to tune Linux, Mac OSX, and FreeBSD hosts connected at speeds of 1Gbps or higher for maximum I/O performance for wide area network transfers. Note that several of the tuning settings described here will actually decrease performance of hosts connected at rates of OC3 (155 Mbps) or less, such as home users.

  • 40G Tuning For hosts with 40G ethernet NICS, there are a number of additional things you might need to think about if you want individual flows to be more than around 5Gbps. First of all, if you have a 40G NIC you are probably using a Intel "Sandy/Ivy Bridge" motherboard. This means you may need to worry about what core is being used. For example, here are the results using a random core:  #nuttcp -i1 10.12.1.20 1079.7500 MB /   1.00 sec = 9057.5180 Mbps     0 retrans 1083.3750 MB /   1.00…