linux-kernel - Re: [PATCH v7 bpf-next 0/6] xsk: build skb by page (aka generic zerocopy xmit)

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Date:   Thu, 18 Feb 2021 11:49:01 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Alexander Lobakin <alobakin@...me>,
        Daniel Borkmann <daniel@...earbox.net>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Dust Li <dust.li@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v7 bpf-next 0/6] xsk: build skb by page (aka generic
 zerocopy xmit)

On Wed, 17 Feb 2021 22:08:55 -0800 John Fastabend wrote:
> > ---------------- Performance Testing ------------
> > 
> > The test environment is Aliyun ECS server.
> > Test cmd:
> > ```
> > xdpsock -i eth0 -t  -S -s <msg size>
> > ```
> > 
> > Test result data:
> > 
> > size    64      512     1024    1500
> > copy    1916747 1775988 1600203 1440054
> > page    1974058 1953655 1945463 1904478
> > percent 3.0%    10.0%   21.58%  32.3%
> >   
> 
> For the series, but might be good to get Dave or Jakub to check
> 2/6 to be sure they agree.

Not sure if Dave would consider holding this series just because of
this, but I'm not a huge fan. I think moving towards a bitfield would
be a better direction an all these flags and defines.

This series is not the place for such effort, so perhaps drop patch 2,
leave it be and follow up with a conversion to a bitfield?