netdev - Re: [PATCH net-next] tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in

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Date:	Sun, 22 Feb 2015 23:07:31 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ncardwell@...gle.com
Cc:	netdev@...r.kernel.org, ycheng@...gle.com, edumazet@...gle.com,
	nanditad@...gle.com
Subject: Re: [PATCH net-next] tcp: fix tcp_should_expand_sndbuf() to use
 tcp_packets_in_flight()

From: Neal Cardwell <ncardwell@...gle.com>
Date: Fri, 20 Feb 2015 13:33:16 -0500

> tcp_should_expand_sndbuf() does not expand the send buffer if we have
> filled the congestion window.
> 
> However, it should use tcp_packets_in_flight() instead of
> tp->packets_out to make this check.
> 
> Testing has established that the difference matters a lot if there are
> many SACKed packets, causing a needless performance shortfall.
> 
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Nandita Dukkipati <nanditad@...gle.com>

This is a bug in my view, thus applying to 'net'.

Thanks Neal.
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