EF_CTPIO_MODE - UG1586

Name

ctpio_mode

Default

sf-np

Scope

per-stack

CTPIO transmission mode:

• sf - store and forward

  The NIC will buffer the entire packet before starting to send it on the wire.

• sf-np - store and forward, no poison

  Similar to sf mode but the NIC will guarantee never to emit a poisoned frame under any circumstances. This will force store-and-forward semantics for all users of CTPIO on the same port.

• ct - cut-through

  The NIC will start to send the outgoing packet onto the wire before it has been fully received, improving latency at the cost of occasionally transmitting a poisoned frame under some circumstances (such as the process being descheduled before it has finished writing the packet to the NIC).