[dpdk-dev] KNI performance is not what is claimed

[Jay Rolette]

On Thu, Sep 20, 2018 at 3:16 PM Stephen Hemminger <
stephen at networkplumber.org> wrote:

> On Thu, 20 Sep 2018 15:02:53 -0500
> Jay Rolette <rolette at infinite.io> wrote:
>
> > On Thu, Sep 20, 2018 at 1:11 PM Stephen Hemminger <
> > stephen at networkplumber.org> wrote:
> >
> > > I wonder if KNI is claiming performance that was never measured on
> current
> > > CPU, OS, DPDK.
> > >
> > > With single stream and TCP testing on IXGBE (DPDK), I see lowest
> > > performance with KNI.
> > >
> > >                 Rx              Tx
> > >         KNI     3.2 Gbit/sec    1.3 Gbit/sec
> > >         TAP     4.9             4.7
> > >         Virtio  5.6             8.6
> > >
> > > Perhaps for 18.11 we should change documentation to remove language
> > > claiming
> > > better performance with KNI, and then plan for future deprecation?
> > >
> >
> > Do TAP and Virtio provide equivalent function to KNI? I can't speak for
> any
> > other products, but ours is dependent on KNI. The ability for control
> plane
> > applications to use normal Linux sockets with DPDK is key even if it
> isn't
> > performant.
> >
> > Hopefully the answer is "yes", in which case I'll happily port over to
> > using one of the faster mechanisms.
> >
> > Thanks,
> > Jay
>
> See:
>
> https://doc.dpdk.org/guides-17.11/howto/virtio_user_as_exceptional_path.html


Thanks. Looks like it's time to run some experiments again.

Jay