netdev - Re: [PATCH net-next] tcp: introduce tcp_try

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Message-ID: <CADVnQy=igJdbcG4J2HU7nEJUNM84qVcLa08h6g6MQQ8-fvgxHg@mail.gmail.com>
Date:	Mon, 23 Apr 2012 22:39:10 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Subject: Re: [PATCH net-next] tcp: introduce tcp_try_coalesce

On Mon, Apr 23, 2012 at 1:11 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> commit c8628155ece3 (tcp: reduce out_of_order memory use) took care of
> coalescing tcp segments provided by legacy devices (linear skbs)
>
> We extend this idea to fragged skbs, as their truesize can be heavy.
>
> ixgbe for example uses 256+1024+PAGE_SIZE/2 = 3328 bytes per segment.
>
> Use this coalescing strategy for receive queue too.
>
> This contributes to reduce number of tcp collapses, at minimal cost, and
> reduces memory overhead and packets drops.

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

Thanks for the background info, Eric.

neal
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