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==== Latency ==== Rx and Tx pipeline latency for standard Ethernet packets SHOULD NOT exceed 2 usec each, MUST NOT exceed 4 usec at 90% and MUST NOT exceed 20 us at 99%, as measured under optimal conditions with no competing workload generating bus contention. If one of these bounds cannot be met, then this MUST be reported. This requirement must be met for a standard device configuration. That is, checksum offload and RSS must be enabled. Interrupt delay is not included, so interrupt moderation may be disabled or interrupts disabled in favor of polling. This measurement is for packets that do not exercise TSO/USO/PISO or RSC. Tx pipeline latency is the time from when the host signals to the device that work is pending, to packet transmission as defined in the timestamping section. Rx pipeline latency is reception as defined in the timestamping section until the descriptor is first readable by the host. In practice, measurement compares hardware PHY timestamps to best case conditions for host software timestamp measurement, which always overestimates to a degree. The chosen bounds are experimentally arrived at in the same manner and take this measurement error into account. See Appendix B for more details on testing. <span id="appendix-a-checklist"></span>
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