Chelsio Communications Terminator Series Installation And User Manual page 18

Chapter 5. Software/Driver Configuration and Fine-tuning
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FEC auto-negotiation is not supported on optic link.
Note
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If auto-negotiation is disabled, ensure that the same FEC is set on both sides
of the link, for the link to come up.
5.1.2. LRO
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Enabling/Disabling
Large Receive Offload (LRO) support is enabled by default. It can be disabled using cxgbtool:
host:root# sudo cxgbtool cxgbX lro 0
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Displaying status
To verify if LRO is enabled or disabled use:
host:root# sudo cxgbtool cxgbX qset
In the output, the LRO field should display 0 if disabled and 1 if enabled.
5.1.3. TCP Segmentation Offload Support
TCP Segmentation Offload has been supported since Snow Leopard and enabled by default. It
can be disabled globally by using:
host:root# sysctl net.inet.tcp.tso=0
Chelsio Network Driver for macOS
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