Hardware Timestamps

Onload User Guide (UG1586)

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1.2 English

Setting the SO_TIMESTAMPING option using setsockopt() enables hardware timestamping on TCP or UDP sockets. Timestamps are generated by the adapter for each received packet. A timestamp is generated when the first byte enters the adapter. Timestamp resolution is <8ns on an X2 series adapter.

Functions such as cmesg(), recvmsg() and recvmmsg() can then recover hardware timestamps for packets recovered from a socket.