netdev - Re: [PATCH v2] ipv4: Early TCP socket demux.

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Message-ID: <20120620140454.36847c65@s6510.linuxnetplumber.net>
Date:	Wed, 20 Jun 2012 14:04:54 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, bhutchings@...arflare.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] ipv4: Early TCP socket demux.

On Wed, 20 Jun 2012 14:01:21 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 20 Jun 2012 20:40:04 +0200
> 
> > If someone wants to tune its linux router, he probably already disables
> > GRO because of various issues with too big packets.
> > 
> > GRO adds a significant cost to forwarding path.
> 
> No, Ben is right Eric.  GRO decreases the costs, because it means we
> only need to make one forwarding/netfilter/classification decision for
> N packets instead of 1.

GRO is also important for routers that interact with VM's.
It helps reduce the per-packet wakeup of the guest VM's.
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