Message-ID: <4263470B.9000802@argo.co.il>
Date: Mon, 18 Apr 2005 08:35:07 +0300
From: Avi Kivity <avi@argo.co.il>
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To: "David S. Miller" <davem@davemloft.net>
CC: arjan@infradead.org, andihartmann@01019freenet.de,
       linux-kernel@vger.kernel.org
Subject: Re: More performance for the TCP stack by using additional hardware
 chip on NIC
References: <d3t63d$3qe$1@pD9F86D3F.dip0.t-ipconnect.de>	<1113728880.17394.16.camel@laptopd505.fenrus.org>	<1113733753.15803.26.camel@avik.scalemp> <20050417133620.04b4698d.davem@davemloft.net>
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David S. Miller wrote:

>On Sun, 17 Apr 2005 13:29:14 +0300
>Avi Kivity <avi@argo.co.il> wrote:
>
>  
>
>>TOEs can remove the data copy on receive. In some applications (notably
>>storage), where the application does not touch most of the data, this is
>>a significant advantage that cannot be achieved in a software-only
>>solution.
>>    
>>
>
>You don't need to offload the TCP stack to make this case get
>zero-copy behavior.
>  
>
yes, Willy Tarreau outlined how buffering on the nic and splitting the 
dma can achieve zero copy.

are there any adapters out there which work this way?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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