Ilpo Järvinen wrote:
...I'm still to figure out why tcp_cwnd_down uses snd_ssthresh/2
as lower bound even though the ssthresh was already halved,
so snd_ssthresh should suffice.
I remember this coming up at least once before, so it's probably worth a
comment in the code. Rate-halving attempts to actually reduce cwnd to
half the delivered window. Here, cwnd/4 (ssthresh/2) is a lower bound
on how far rate-halving can reduce cwnd. See the "Bounding Parameters"
section of <http://www.psc.edu/networking/papers/FACKnotes/current/>.
-John
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