netdev - Re: [PATCH] tcp: do not scale TSO segment size with reordering degree

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Date:	Tue, 29 Nov 2011 01:20:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ncardwell@...gle.com
Cc:	netdev@...r.kernel.org, ilpo.jarvinen@...sinki.fi,
	nanditad@...gle.com, ycheng@...gle.com, hkchu@...gle.com,
	therbert@...gle.com
Subject: Re: [PATCH] tcp: do not scale TSO segment size with reordering
 degree

From: Neal Cardwell <ncardwell@...gle.com>
Date: Mon, 21 Nov 2011 22:15:14 -0500

> Since 2005 (c1b4a7e69576d65efc31a8cea0714173c2841244)
> tcp_tso_should_defer has been using tcp_max_burst() as a target limit
> for deciding how large to make outgoing TSO packets when not using
> sysctl_tcp_tso_win_divisor. But since 2008
> (dd9e0dda66ba38a2ddd1405ac279894260dc5c36) tcp_max_burst() returns the
> reordering degree. We should not have tcp_tso_should_defer attempt to
> build larger segments just because there is more reordering. This
> commit splits the notion of deferral size used in TSO from the notion
> of burst size used in cwnd moderation, and returns the TSO deferral
> limit to its original value.
> 
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>

Applied to net-next.
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