mike-karels.net added a comment.
Setting a retransmission timer on an ACK makes no sense; I don't think
tcp_output will send an ACK on a retransmission timeout.
Setting timers in the ENOBUFS case is at best a partial fix. If the ACK is
lost locally, we know; if it is lost elsewhere, we
hiren added a comment.
In https://reviews.freebsd.org/D5872#127345, @jtl wrote:
> In https://reviews.freebsd.org/D5872#127343, @mike-karels.net wrote:
>
> > If we get an ENOBUFS when sending data, we will already be running the
retransmit timer.
>
>
> Good point, but see below.
