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

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Date:	Sun, 13 Mar 2011 01:06:11 -0800
From:	Jon Zhou <Jon.Zhou@...u.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: how to utilize multi tx queue to sent packets



> -----Original Message-----
> From: Stephen Hemminger [mailto:shemminger@...tta.com]
> Sent: Saturday, March 12, 2011 1:07 AM
> To: Jon Zhou
> Cc: 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

How does kernel know which tx_queue to use?
Will dev_queue_xmit determine tx_queue(sw queue) to send packets?
Or just let NIC select a tx_queue(hardware) ?

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