netdev - Re: [PATCH bpf-next 0/5] Bulk optimization for XDP cpumap redirect

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Date:   Wed, 10 Apr 2019 16:36:40 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Networking <netdev@...r.kernel.org>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        bpf <bpf@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>
Subject: Re: [PATCH bpf-next 0/5] Bulk optimization for XDP cpumap redirect

On Wed, Apr 10, 2019 at 6:00 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.

Could you please share some numbers about the optimization?

Thanks,
Song

>
> Patch-1: ptr_ring batch consume
> Patch-2: Send SKB-lists to network stack
> Patch-3: Introduce SKB helper to alloc SKB outside net-core
> Patch-4: kmem_cache bulk alloc of SKBs
> Patch-5: Prefetch struct page to solve CPU stall
>
> ---
>
> Jesper Dangaard Brouer (5):
>       bpf: cpumap use ptr_ring_consume_batched
>       bpf: cpumap use netif_receive_skb_list
>       net: core: introduce build_skb_around
>       bpf: cpumap do bulk allocation of SKBs
>       bpf: cpumap memory prefetchw optimizations for struct page
>
>
>  include/linux/netdevice.h |    1 +
>  include/linux/skbuff.h    |    2 +
>  kernel/bpf/cpumap.c       |   66 +++++++++++++++++++++++++++++-------------
>  net/core/dev.c            |   18 +++++++++++
>  net/core/skbuff.c         |   71 +++++++++++++++++++++++++++++++++------------
>  5 files changed, 118 insertions(+), 40 deletions(-)
>
> --