the tool flowgrind seems like it might be an interesting backend for flent to support: https://github.com/flowgrind/flowgrind

From its README:

Unlike most cross-platform testing tools, flowgrind can output some transport layer information, which are usually internal to the TCP/IP stack. For example, on Linux and FreeBSD this includes among others the kernel's estimation of the end-to-end RTT, the size of the TCP congestion window (CWND) and slow start threshold (SSTHRESH).

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