netdev - Re: [PATCH net-next 2/2] tcp_cubic: refine Hystart delay threshold

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Message-Id: <20141209.145856.1280304544503810169.davem@davemloft.net>
Date:	Tue, 09 Dec 2014 14:58:56 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, nanditad@...gle.com, ncardwell@...gle.com,
	ycheng@...gle.com, sangtae.ha@...il.com
Subject: Re: [PATCH net-next 2/2] tcp_cubic: refine Hystart delay threshold

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 04 Dec 2014 16:13:49 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> In commit 2b4636a5f8ca ("tcp_cubic: make the delay threshold of HyStart
> less sensitive"), HYSTART_DELAY_MIN was changed to 4 ms.
> 
> The remaining problem is that using delay_min + (delay_min/16) as the
> threshold is too sensitive.
> 
> 6.25 % of variation is too small for rtt above 60 ms, which are not
> uncommon.
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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