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===== Earliest Departure Time ===== Linux v6.3 '''tools/testing/selftests/net/so_txtime.c '''implements both a sender and receiver side for a transmit test. The sender transmits UDP packets with an earliest delivery time configured with the SO_TXTIME socket option. The receiver validates arrival rate against expectations. Testing delivery time requires tight clock synchronization. The test can be run on a single machine. Either with two devices, or with a single device by configuring two IPVLAN virtual devices in separate network namespaces. Aside from exercising physical hardware, the setup is similar to that in the accompanying '''so_txtime.sh''', which only differs by using entirely virtual devices to test software pacing. Testing delivery time requires packets arriving with EDT timestamp unmodified at the driver. This requires EDT support from the Linux queueing discipline (qdisc). '''so_txtime.sh''' demonstrates software EDT with the FQ and ETF qdiscs. ETF also supports hardware offload in Linux v6.3. At the time of writing hardware offload for FQ is in development. <span id="timestamping"></span>
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