netdev - Re: [RFC PATCH bpf-next 2/4] bpf: introduce BPF dispatcher

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Message-ID: <CAJ+HfNhRKFGOsv5Nbq5T9NHk=ZcHnK40_jR8bpqNC1GYk8ovTA@mail.gmail.com>
Date:   Thu, 14 Nov 2019 16:03:57 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        bpf <bpf@...r.kernel.org>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>
Subject: Re: [RFC PATCH bpf-next 2/4] bpf: introduce BPF dispatcher

On Thu, 14 Nov 2019 at 15:55, Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
[...]
> I don't really have anything to back it up, but my hunch is that only 4
> entries will end up being a limit that people are going to end up
> hitting. And since the performance falls off quite the cliff after
> hitting that limit, I do fear that this is something we will hear about
> quite emphatically :)
>

Hmm, maybe. I have 8 i40e netdevs on my test machine, all running XDP,
but I don't think that's normal for deployments. ;-)

Björn