netdev - Re: Hight speed data sending from custom IP out of kernel

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Date:	Mon, 25 Apr 2011 14:27:48 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	monstr@...str.eu
Cc:	juice@...gman.org, netdev@...r.kernel.org
Subject: Re: Hight speed data sending from custom IP out of kernel

Le lundi 25 avril 2011 à 14:18 +0200, Michal Simek a écrit :

> > 
> > Now, if all you want to do is send many packets from pktgen (with only
> > ID changing), you could add a fast path to not rebuild from scratch new
> > packets.
> 
> What do you mean?


If you know your device has X slots in its TX ring buffer, you would
have to maintain at least X+1 skbs in pktgen to make sure you reuse an
skb while its previous logical content was sent on wire.

Then you are free to only change iph->id and iph->check very fast.




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