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The Transport Control Protocol (TCP) is a low-level part of the protocol stack used by the Internet. It sits directly above the IP layer and is responsible for making sure that dropped packets are resent.

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Short answer: for kernel 4.4.0 TCP PACING is enabled by default and is set to ~34.36Gb/s per socket. Since kernel 4.13.0-rc1, TCP PACING is disabled by default. On both cases, since TSO is enabled … , TCP PACING would have no effect when pacing rate is set to the default value. TCP PACING is set for a socket using the sock_setsockopt() function (net/core/sock.c). The flag for doing so is …
modified Apr 6 by Rui F Ribeiro