Re: Fast Packet Sending

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On Tuesday 14 January 2003 13:50, Catalin BOIE wrote:
> > Hello,
>
> Hello!
>
> > I need to implement a system which acts somewhat like a router, i.e. it
> > grabs udp packets from the internet, processess them and then sends them
> > on an ethernet via broadcast. Following the indications I got on a
> > linux-kernel list thread, I did the packet recieving stuff using a mmaped
> > packet socket.
> >
> > >From what I understand, that is a recieve-only interface, so it seems
> > > that
> >
> > I'm stuck with old sendto() for putting the packets back on the wire. I'd
> > like to know if sendto() can do 20000 (small) packets/second on a fast MP
> > machine (dual or maybe quad) which doesn't do much besides this routing
> > process. If it can't, please tell me if there's any feasible way of
> > implementing a kind of buffer, i.e. keeping recieved packets in a local
> > buffer and sending them alltoghether when the buffer fills or after a
> > timer expires (I'm thinking DMA to the NIC or something simmilar, as the
> > buffer will contain the complete packets, with all the required packets).
> >
> > Thanks,
> > Mihnea
> >
> > PS: feasible == not spending 1 month development time for a 1
> > microsecond/packet improvement.
>
> It's a userspace program or a kernel module?

Right now it's userspace, but if sendto() won't do, I suppose I would need to 
write a kernel module to do that DMA stuff...

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