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From: Jay Rolette <rolette@infinite.io>
Date: Thu, 20 Sep 2018 15:02:53 -0500
Message-ID: <CADNuJVpnzHsq9d9R7buU9Zq43pSAWSa6RPsJ2RczQwgv6nFARw@mail.gmail.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: DPDK <dev@dpdk.org>
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Subject: Re: [dpdk-dev] KNI performance is not what is claimed
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On Thu, Sep 20, 2018 at 1:11 PM Stephen Hemminger <
stephen@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