netdev - Re: [PATCH v4 bpf-next] cpumap: bulk skb using netif_receive_skb

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Message-ID: <20210423123455.279dae88@carbon>
Date:   Fri, 23 Apr 2021 12:34:55 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, toke@...hat.com,
        song@...nel.org, brouer@...hat.com
Subject: Re: [PATCH v4 bpf-next] cpumap: bulk skb using
 netif_receive_skb_list

On Fri, 23 Apr 2021 11:27:27 +0200
Lorenzo Bianconi <lorenzo@...nel.org> wrote:

> 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. Packets are discarded by the
> UDP layer.
> 
> $xdp_redirect_cpu  --cpu <cpu> --progname xdp_cpu_map0 --dev <eth>
> 
> bpf-next: ~2.35Mpps
> bpf-next + cpumap skb-list: ~2.72Mpps
> 
> Rename drops counter in kmem_alloc_drops since now it reports just
> kmem_cache_alloc_bulk failures
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer