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

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Message-Id: <20120903.143433.1794691067153660874.davem@davemloft.net>
Date:	Mon, 03 Sep 2012 14:34:33 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ncardwell@...gle.com
Cc:	ycheng@...gle.com, nanditad@...gle.com, mattmathis@...gle.com,
	edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] tcp: use PRR to reduce cwin in CWR state

From: Neal Cardwell <ncardwell@...gle.com>
Date: Mon, 3 Sep 2012 00:00:44 -0400

> 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>

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