Re: zero-copy udp

[Stephen Hemminger]

On Mon, 3 Dec 2007 12:26:28 -0800
Martin Hess <martinhess@xxxxxxx> wrote:

> Does anyone know if there is a zero-copy udp implementation for Linux?  
> I know that it will have some limitations like not using a standard  
> socket api, and most likely not being able to use that card for any  
> other purpose.
> 
> Specifically I want absolutely no copying into kernel space; I want to  
> go between userspace and the ethernet card directly. This of course  
> makes dispatching to different protocols difficult so I'm fine with  
> using the card for this purpose only.
> 
> I'm trying to use off the shelf components and not have to go to the  
> specialty products like Myricom. I would also like to use udp because  
> I want something that is out of the box routable through normal ipv4  
> routers. However, I'm fine with any unreliable message protocol that  
> routes by default through ipv4 routers.
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Simplest and safest approach without other changes is 
to use AF_PACKET and mmap.

-- 
Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx>
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