[Ecn-sane] cwnd/2 - 1

[Pete Heist]

> On Sep 7, 2018, at 9:18 AM, Dave Taht <dave.taht at gmail.com> wrote:
> 
> One of the things that went by in recent kernel changes was that
> linux tcp at a cwnd 2 on a CE goes into quickack mode, so that we
> get back one ack per packet (I think, from reading the commit) instead of
> every other one.

For my understanding, when does tcp return to delayed ack mode, once cwnd increases again?