Date: Thu, 28 Jun 2012 20:26:50 +0200 From: rizzo <rizzo@iet.unipi.it> To: "root@9du.org" <root@9du.org> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: about netmap NETMAP_HW_RING recv pcaket Message-ID: <20120628182650.GA24536@onelab2.iet.unipi.it> In-Reply-To: <2012062821245416134218@9du.org> References: <20120628120031.460411065674@hub.freebsd.org> <2012062821245416134218@9du.org>
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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
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