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Date: Thu, 28 Jun 2012 20:26:50 +0200
From: rizzo <rizzo@iet.unipi.it>
To: "root@9du.org" <root@9du.org>
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Cc: freebsd-current <freebsd-current@freebsd.org>
Subject: Re: about netmap NETMAP_HW_RING recv pcaket
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On Thu, Jun 28, 2012 at 09:24:59PM +0800, root@9du.org wrote:
> in pkt-gen.c 
> tifreq.nr_ringid = (g.nthreads > 1) ? (i | NETMAP_HW_RING) : 0; 
> 
> in netmap.c 
> if (priv->np_qlast != NETMAP_HW_RING) {
> lim_tx = lim_rx = priv->np_qlast;
> }
> ....
> 
> if nthreads 2.but have 8 num_tx_rings.(ixgbe default is 8)
> looks like
> thread #1 priv->np_qfirst = 0 priv->np_qlast = 1 
> thread #2 priv->np_qfirst = 1 priv->np_qlast = 2
>  
> if packet in  num_tx_rings 2-7 will be lost some packet? 

if you decide to attach to individual rings then it is
up to you to bind enough threads as there are rings.
pkt-gen.c is only a test program, not all combinations
of options are necessary meaningful

cheers
luigi