netdev - What are "forward retransmits"?

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Date:   Tue, 3 Jan 2017 10:34:54 +0200
From:   Itai Fiat Gecht <itaifg@...inidat.com>
To:     netdev@...r.kernel.org
Subject: What are "forward retransmits"?

Hi,

What are the "forward retransmits" shown by netstat? Is there an RFC
or other documentation describing them? I could not figure this out
from tcp_output.c.

Sample netstat output:

    106926 fast retransmits
    5149 forward retransmits
    915 retransmits in slow start

Sincerely yours,

Itai