netdev - Re: using software TSO on non-TSO capable netdevices

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Message-ID: <20080731125903.GA8773@gondor.apana.org.au>
Date:	Thu, 31 Jul 2008 20:59:03 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	akarkare@...vell.com, nico@....org
Subject: Re: using software TSO on non-TSO capable netdevices

On Thu, Jul 31, 2008 at 02:37:31PM +0200, Lennert Buytenhek wrote:
>
> Like this?

Yes that ought to do the trick.

> From: Lennert Buytenhek <buytenh@...tstofly.org>
> Subject: [NET] use software GSO for SG+CSUM capable netdevices
> 
> If a netdevice does not support hardware GSO, allowing the stack to
> use GSO anyway and then splitting the GSO skb into MSS-sized pieces
> as it is handed to the netdevice for transmitting is likely still
> a win as far as throughput and/or CPU usage are concerned, since it
> reduces the number of trips through the output path.
> 
> This patch enables the use of GSO on any netdevice that supports SG.
> If a GSO skb is then sent to a netdevice that supports SG but does not
> support hardware GSO, net/core/dev.c:dev_hard_start_xmit() will take
> care of doing the necessary GSO segmentation in software.
> 
> Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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