netdev - Re: [PATCH net] tcp: align tcp_xmit_size_goal() on tcp_tso

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Message-Id: <20150305.223126.2026710566547866821.davem@davemloft.net>
Date:	Thu, 05 Mar 2015 22:31:26 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ycheng@...gle.com, ncardwell@...gle.com
Subject: Re: [PATCH net] tcp: align tcp_xmit_size_goal() on
 tcp_tso_autosize()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 05 Mar 2015 08:03:06 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> With some mss values, it is possible tcp_xmit_size_goal() puts
> one segment more in TSO packet than tcp_tso_autosize().
> 
> We send then one TSO packet followed by one single MSS.
> 
> It is not a serious bug, but we can do slightly better, especially
> for drivers using netif_set_gso_max_size() to lower gso_max_size.
> 
> Using same formula avoids these corner cases and makes
> tcp_xmit_size_goal() a bit faster.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Fixes: 605ad7f184b6 ("tcp: refine TSO autosizing")

Applied, thanks Eric.
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