netmap: traffic distribution

[hiren panchasara]

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
>