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

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Message-ID: <87zhgymqyw.fsf@toke.dk>
Date:   Thu, 14 Nov 2019 16:12:55 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Björn Töpel <bjorn.topel@...il.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

Björn Töpel <bjorn.topel@...il.com> writes:

> 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. ;-)

Well, the fact that products like this exist kinda indicates that this
is something people are doing, no?

https://small-tree.net/products/10gbe-switches/p3e10g-6-sr/

-Toke