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

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Message-ID: <1392835787.18849.11.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 19 Feb 2014 10:49:47 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	fw@...len.de, netdev@...r.kernel.org
Subject: Re: [PATCH -next] net: tcp: add mib counters to track zero window
 transitions

On Wed, 2014-02-19 at 13:17 -0500, David Miller wrote:
> 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?

Thanks, I missed this patch. Let me think about it, thanks !


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