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

Stephen Hemminger stephen at networkplumber.org
Thu Sep 20 22:16:30 CEST 2018


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


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