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

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Message-ID: <CADVnQykSd6==wJv4NpcfazqDSyxF4kRXA5u0NDUJO4hv9a-4jA@mail.gmail.com>
Date:	Thu, 5 Mar 2015 11:13:31 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH net] tcp: align tcp_xmit_size_goal() on tcp_tso_autosize()

On Thu, Mar 5, 2015 at 11:03 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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")

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
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