netdev - Re: [PATCH v2 net-next] tcp: fix ABC in tcp_slow

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Message-ID: <CADVnQymKnrN5Z=Pmzj3LvABS9A6SbqdWUKvjAtc5p833DO7PDQ@mail.gmail.com>
Date:	Fri, 20 Jul 2012 09:50:36 -0700
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Yuchung Cheng <ycheng@...gle.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	John Heffner <johnwheffner@...il.com>,
	Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: [PATCH v2 net-next] tcp: fix ABC in tcp_slow_start()

On Fri, Jul 20, 2012 at 9:08 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> So to address your point, maybe we should clear  snd_cwnd_cnt
> when leaving slow start for congestion avoidance phase ?

Sounds good. That can be a separate commit to add the new logic to the
end of tcp_slow_start() to check to see if we've bumped into ssthresh
and reset snd_cwnd_cnt.

neal
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