netdev - Re: [PATCH net] tcp: make congestion control optionally skip slow start after idle

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Date:   Mon, 08 May 2017 14:37:59 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     weiwan@...gle.com
Cc:     netdev@...r.kernel.org, ycheng@...gle.com, ncardwell@...gle.com,
        edumazet@...gle.com
Subject: Re: [PATCH net] tcp: make congestion control optionally skip slow
 start after idle

From: Wei Wang <weiwan@...gle.com>
Date: Fri,  5 May 2017 12:53:23 -0700

> From: Wei Wang <weiwan@...gle.com>
> 
> Congestion control modules that want full control over congestion
> control behavior do not want the cwnd modifications controlled by
> the sysctl_tcp_slow_start_after_idle code path.
> So skip those code paths for CC modules that use the cong_control()
> API.
> As an example, those cwnd effects are not desired for the BBR congestion
> control algorithm.
> 
> Fixes: c0402760f565 ("tcp: new CC hook to set sending rate with rate_sample in any CA state")
> Signed-off-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>

Applied and queued up for -stable, thanks.