netmap, VALE and netmap pipes

[Luigi Rizzo]

On Fri, Feb 21, 2014 at 5:03 PM, jerry <jerry.lilijun at huawei.com> wrote:

> Hi Luigi,
>
> How to use netmap pipe by pkt-gen commands?
> I have tried the commands as follows:
>   ./pkt-gen -i netmap:pipename{1 -f tx
>   ./pkt-gen -i netmap:pipename}1 -f rx  (in another terminal)
> But it works failed.
> Should the pipename be replaced with a invalid NIC name such as "eth3" in
> netmap mode?
>

netmap: expects the name of an existing device.
Arbitrary names should have the 'vale' prefix e.g.

./pkt-gen -i valexx:p{0 -f tx
./pkt-gen -i valexx:p}0 -f rx



>
> The netmap pipe works from software ring to software ring independently
> with NICs, I understand. Is that right?
>
>
correct, but the basename is used to group ports
(NICs/VALE ports and netmap pipes) that use the same
shared memory so that you can do zero copy among them.

cheers
luigi
 

> B.R.
> Jerry
>
> On 2014/2/17 18:11, Luigi Rizzo wrote:
> > Hi,
> > we have recently made a few extensions to netmap/VALE and put various
> > pieces of code on public repositories, so i thought i'd share the
> > pointers. All the code below runs with equal features and performance
> > on FreeBSD and Linux, and we are trying to upstream it in the relevant
> > projects if possible (as an example, QEMU recently added a netmap
> backend),
> > at which point some of these clone repositories will become unnecessary.
> >
> > See http://info.iet.unipi.it/~luigi/netmap for more details.
> >
> > https://code.google.com/p/netmap/
> >     The latest netmap code for FreeBSD/Linux. It has native support
> >     for certain NICs; emulated netmap over unmodified drivers;
> >     enhanced parallelism in the VALE switch (20 Mpps/source, scaling
> >     up to ~50Mpps); and a new feature called "netmap pipe" that
> >     does zero-copy blocking I/O at over 100 Mpps.
> >         Other features are the ability to allocate tons of extra
> >     netmap buffers, and configurable sharing of memory among NICs,
> >     VALE ports and netmap pipes. This increases the opportunity for
> >     zero copy operation.
>
>
>
>
>


-- 
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 Prof. Luigi RIZZO, rizzo at iet.unipi.it  . Dip. di Ing. dell'Informazione
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