netdev - Re: [PATCH bpf-next V2 0/4] Bulk optimization for XDP cpumap redirect

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Date:   Wed, 17 Apr 2019 19:15:04 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <borkmann@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Song Liu <songliubraving@...com>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Edward Cree <ecree@...arflare.com>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next V2 0/4] Bulk optimization for XDP cpumap redirect

On Fri, Apr 12, 2019 at 8:07 AM Jesper Dangaard Brouer
<brouer@...hat.com> wrote:
>
> This patchset utilize a number of different kernel bulk APIs for optimizing
> the performance for the XDP cpumap redirect feature.
>
> Benchmark details are available here:
>  https://github.com/xdp-project/xdp-project/blob/master/areas/cpumap/cpumap03-optimizations.org
>
> Performance measurements can be considered micro benchmarks, as they measure
> dropping packets at different stages in the network stack.
> Summary based on above:
>
> Baseline benchmarks
> - baseline-redirect: UdpNoPorts: 3,180,074
> - baseline-redirect: iptables-raw drop: 6,193,534
>
> Patch1: bpf: cpumap use ptr_ring_consume_batched
> - redirect: UdpNoPorts: 3,327,729
> - redirect: iptables-raw drop: 6,321,540
>
> Patch2: net: core: introduce build_skb_around
> - redirect: UdpNoPorts: 3,221,303
> - redirect: iptables-raw drop: 6,320,066
>
> Patch3: bpf: cpumap do bulk allocation of SKBs
> - redirect: UdpNoPorts: 3,290,563
> - redirect: iptables-raw drop: 6,650,112
>
> Patch4: bpf: cpumap memory prefetchw optimizations for struct page
> - redirect: UdpNoPorts: 3,520,250
> - redirect: iptables-raw drop: 7,649,604
>
> In this V2 submission I have chosen drop the SKB-list patch using
> netif_receive_skb_list() as it was not showing a performance improvement for
> these micro benchmarks.

Applied. Thanks!