netmap: traffic distribution

[Michio Honda]

Hi, 
The handiest way to try flexible flow distribution is using Flow Director.I've confirmed that the patch posted to this list two years ago works with netmap/ixgbe.http://freebsd.1045724.n5.nabble.com/Adding-Flow-Director-sysctls-to-ixgbe-4-td4769489.html
Cheers,- Michio

> Date: Wed, 25 Sep 2013 02:12:54 -0700
> Subject: Re: netmap: traffic distribution
> From: hiren.panchasara at gmail.com
> To: rizzo at iet.unipi.it
> CC: freebsd-net at freebsd.org
> 
> On Wed, Sep 25, 2013 at 2:05 AM, Luigi Rizzo <rizzo at iet.unipi.it> wrote:
> 
> > On Wed, Sep 25, 2013 at 10:53 AM, hiren panchasara
> > <hiren.panchasara at gmail.com> wrote:
> > >
> > >
> > >
> > > On Wed, Sep 25, 2013 at 1:22 AM, Luigi Rizzo <rizzo at iet.unipi.it> wrote:
> > >>
> > >> On Wed, Sep 25, 2013 at 10:07 AM, hiren panchasara
> > >> <hiren.panchasara at gmail.com> wrote:
> > >> >
> > >> > I am providing line rate traffic (via pkg-gen.c) to my 10gig ix
> > >> > interface.
> > >> >
> > >> > Now on receiving side, is there a way to sub-divide the traffic into
> > >> > multiple workloads using netmap?
> > >> >
> > >> > For example, can I get two 5G flows from 10Gbps traffic?
> > >>
> > >> not directly. You'd need to send packets with different addresses that
> > >> match
> > >> the way the filters on the NIC (RSS or similar) are programmed.
> > >
> > >
> > > Thanks for quick responses, Liugi.
> > >
> > > So, FreeBSD needs PF_RING like thing? Any other way we can do it?
> >
> > no,
> > PF_RING does nothing more than netmap.
> >
> Okay.
> 
> >
> > the partitioning of traffic into queues is done by the NIC's hardware,
> > through some filters that i mentioned and are NIC specific.
> > They are often named RSS (receive side scaling), RFS (receive flow
> > steering),
> > Flow Director,  and so on. Some NICs compute a hash of various header
> > fields
> > and use the result to direct packets to specific queues. Others have
> > "exact match" filters where you can map certain mac headers to
> > specific queues, and so on.
> >
> 
> Alright. I will investigate more about RSS/RFS for ixgbe.
> 
> Thanks a bunch,
> Hiren
> 
> >
> > A software demultiplexer that sits on top of a netmap ring
> > may certainly be useful, but i have not yet designed it.
> >
> >
> > cheers
> > luigi
> >
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