netdev - Re: [PATCH v2 bpf-next] cpumap: bulk skb using netif_receive_skb

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Date:   Tue, 13 Apr 2021 21:41:46 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, brouer@...hat.com, song@...nel.org
Subject: Re: [PATCH v2 bpf-next] cpumap: bulk skb using netif_receive_skb_list

Lorenzo Bianconi <lorenzo@...nel.org> writes:

> Rely on netif_receive_skb_list routine to send skbs converted from
> xdp_frames in cpu_map_kthread_run in order to improve i-cache usage.
> The proposed patch has been tested running xdp_redirect_cpu bpf sample
> available in the kernel tree that is used to redirect UDP frames from
> ixgbe driver to a cpumap entry and then to the networking stack.
> UDP frames are generated using pkt_gen.
>
> $xdp_redirect_cpu  --cpu <cpu> --progname xdp_cpu_map0 --dev <eth>
>
> bpf-next: ~2.2Mpps
> bpf-next + cpumap skb-list: ~3.15Mpps

Nice! :)

Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>