netdev - Re: [PATCH bpf-next v3 0/6] Introduce the BPF dispatcher

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Date:   Tue, 10 Dec 2019 21:04:06 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Edward Cree <ecree@...arflare.com>,
        Toke Høiland-Jørgensen <thoiland@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH bpf-next v3 0/6] Introduce the BPF dispatcher

On Tue, 10 Dec 2019 at 20:28, Samudrala, Sridhar
<sridhar.samudrala@...el.com> wrote:
>
[...]
> > The tests were performed using the xdp_rxq_info sample program with
> > the following command-line:
> >
> > 1. XDP_DRV:
> >    # xdp_rxq_info --dev eth0 --action XDP_DROP
> > 2. XDP_SKB:
> >    # xdp_rxq_info --dev eth0 -S --action XDP_DROP
> > 3. xdp-perf, from selftests/bpf:
> >    # test_progs -v -t xdp_perf
>
> What is this test_progs? I don't see such ann app under selftests/bpf
>

The "test_progs" program resides in tools/testing/selftests/bpf. The
xdp_perf is part of the series!

>
> > Run with mitigations=auto
> > -------------------------
> >
> > Baseline:
> > 1. 22.0 Mpps
> > 2. 3.8 Mpps
> > 3. 15 ns
> >
> > Dispatcher:
> > 1. 29.4 Mpps (+34%)
> > 2. 4.0 Mpps  (+5%)
> > 3. 5 ns      (+66%)
> >
> > Dispatcher (full; walk all entries, and fallback):
> > 1. 20.4 Mpps (-7%)
> > 2. 3.8 Mpps
> > 3. 18 ns     (-20%)
>
> Are these packets received on a single queue? Or multiple queues?
> Do you see similar improvements even with xdpsock?
>

Yes, just a single queue, regular XDP. I left out xdpsock for now, and
only focus on the micro benchmark and XDP. I'll get back with xdpsock
benchmarks.


Cheers,
Björn