netdev - Re: [PATCH v3 bpf-next 2/2] veth: Support bulk XDP

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Date:   Thu, 13 Jun 2019 14:13:51 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Toshiaki Makita <toshiaki.makita1@...il.com>
Cc:     brouer@...hat.com, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, xdp-newbies@...r.kernel.org,
        bpf@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH v3 bpf-next 2/2] veth: Support bulk XDP_TX

On Thu, 13 Jun 2019 18:39:59 +0900
Toshiaki Makita <toshiaki.makita1@...il.com> wrote:

> XDP_TX is similar to XDP_REDIRECT as it essentially redirects packets to
> the device itself. XDP_REDIRECT has bulk transmit mechanism to avoid the
> heavy cost of indirect call but it also reduces lock acquisition on the
> destination device that needs locks like veth and tun.
> 
> XDP_TX does not use indirect calls but drivers which require locks can
> benefit from the bulk transmit for XDP_TX as well.
> 
> This patch introduces bulk transmit mechanism in veth using bulk queue
> on stack, and improves XDP_TX performance by about 9%.
> 
> Here are single-core/single-flow XDP_TX test results. CPU consumptions
> are taken from "perf report --no-child".
> 
> - Before:
> 
>   7.26 Mpps
> 
>   _raw_spin_lock  7.83%
>   veth_xdp_xmit  12.23%
> 
> - After:
> 
>   7.94 Mpps
> 
>   _raw_spin_lock  1.08%
>   veth_xdp_xmit   6.10%
> 
> v2:
> - Use stack for bulk queue instead of a global variable.
> 
> Signed-off-by: Toshiaki Makita <toshiaki.makita1@...il.com>
> ---
>  drivers/net/veth.c | 60 +++++++++++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 48 insertions(+), 12 deletions(-)

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