netdev - Re: how to utilize multi tx queue to sent packets

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Date:	Fri, 11 Mar 2011 09:06:36 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jon Zhou <Jon.Zhou@...u.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: how to utilize multi tx queue to sent packets

On Thu, 10 Mar 2011 22:52:30 -0800
Jon Zhou <Jon.Zhou@...u.com> wrote:

> hi
> 
> I am doing some test according to the
> website:http://wiki.ipxwarzone.com/index.php5?title=Linux_packet_mmap
> 
> use packet_mmap tx_ring to send packet.
> 
> I modified the sample code "packetmmap.c" to make it send packets have different outer ip.
> so that with the help of RSS, I can achieve higher throughput.
> 
> but one thing I saw at the tx side, is that all the packets are sent via the same tx_queue,
> which is conflict with what I saw at the rx side.
> any idea to make it sent packets via different tx_queues? (spread across the tx_queues)

You need to have multiple threads to get Tx scaling.
In you case that also means multiple AF_PACKET sockets and separate rings.

Or just run multiple copies of the same test each with a different IP
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