tcpbench(1) on OpenBSD
The text 9e67e52240b9, as OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4 shipped it.
TCP benchmarking and measurement tool
Flags it lists
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-B -
-S -
-k -
-l -
-n -
-p -
-r -
-s -
-v