netdev - Re: [PATCH -next] net: tcp: add mib counters to track zero window transitions

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Message-Id: <20140219.131708.562226572566677127.davem@davemloft.net>
Date:	Wed, 19 Feb 2014 13:17:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH -next] net: tcp: add mib counters to track zero window
 transitions

From: Florian Westphal <fw@...len.de>
Date: Mon, 17 Feb 2014 22:57:48 +0100

> Three counters are added:
> - one to track when we went from non-zero to zero window
> - one to track the reverse
> - one counter incremented when we want to announce zero window.
> 
> The latter is added because it can show cases where we want to close the
> window but can't because we would shrink window.
> 
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  Eric, is this what you had in mind?
> 
>  I re-ran my 'slow-sender-with-reader-that-does-not-drain-socket'
>  scenario and, as expected, only TCPWANTZEROWINDOW increases.

Eric, ping?
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