netdev - Re: [PATCH 3/3] tcp: use PRR to reduce cwin in CWR state

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Message-ID: <CADVnQyma09UtSLusyQ6986uz2yfy-3xZ+mXrHfn1A2HO+3=X_g@mail.gmail.com>
Date:	Mon, 3 Sep 2012 00:00:44 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Matt Mathis <mattmathis@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/3] tcp: use PRR to reduce cwin in CWR state

On Sun, Sep 2, 2012 at 11:38 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> Use proportional rate reduction (PRR) algorithm to reduce cwnd in CWR state,
> in addition to Recovery state. Retire the current rate-halving in CWR.
> When losses are detected via ACKs in CWR state, the sender enters Recovery
> state but the cwnd reduction continues and does not restart.
>
> Rename and refactor cwnd reduction functions since both CWR and Recovery
> use the same algorithm:
> tcp_init_cwnd_reduction() is new and initiates reduction state variables.
> tcp_cwnd_reduction() is previously tcp_update_cwnd_in_recovery().
> tcp_ends_cwnd_reduction() is previously  tcp_complete_cwr().
>
> The rate halving functions and logic such as tcp_cwnd_down(), tcp_min_cwnd(),
> and the cwnd moderation inside tcp_enter_cwr() are removed. The unused
> parameter, flag, in tcp_cwnd_reduction() is also removed.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
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