netdev - Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices?

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Date:	Fri, 15 Jan 2010 09:50:49 +0100
From:	Simon Kagstrom <simon.kagstrom@...insight.net>
To:	David Miller <davem@...emloft.net>
Cc:	krkumar2@...ibm.com, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices?

On Fri, 15 Jan 2010 00:36:36 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> > Remove inline skb data in tcp_sendmsg(). For the few devices that
> > don't support NETIF_F_SG, dev_queue_xmit will call skb_linearize,
> > and pass the penalty to those slow devices (the following drivers
> > do not support NETIF_F_SG: 8139cp.c, amd8111e.c, dl2k.c, dm9000.c,
> > dnet.c, ethoc.c, ibmveth.c, ioc3-eth.c, macb.c, ps3_gelic_net.c,
> > r8169.c, rionet.c, spider_net.c, tsi108_eth.c, veth.c,
> > via-velocity.c, atlx/atl2.c, bonding/bond_main.c, can/dev.c,
> > cris/eth_v10.c).
> 
> I was really surprised to see r8169.c in that list.
> 
> It even has all the code in it's ->ndo_start_xmit() method
> to build fragments properly and handle segmented SKBs, it
> simply doesn't set NETIF_F_SG in dev->features for whatever
> reason.

The same thing goes for via-velocity.c, it's turned on via ethtool
though (ethtool_op_set_sg).

// Simon
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