netdev - Re: [RFC PATCH 00/17] xdp: Add packet queueing and scheduling capabilities

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Message-ID: <CAA93jw7SsxOqOE8YJOLikkzSsNQuBqdkGLreoD-DDgQM4n-9sg@mail.gmail.com>
Date:   Thu, 14 Jul 2022 07:56:05 -0700
From:   Dave Taht <dave.taht@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Mykola Lysenko <mykolal@...com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        Freysteinn Alfredsson <freysteinn.alfredsson@....se>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [RFC PATCH 00/17] xdp: Add packet queueing and scheduling capabilities

In general I feel a programmable packet pacing approach is the right
way forward for the internet as a whole.

It lends itself more easily and accurately to offloading in an age
where it is difficult to do anything sane within a ms on the host
cpu, especially in virtualized environments, in the enormous dynamic
range of kbits/ms to gbits/ms between host an potential recipient [1]

So considerations about what is easier to offload moving forward vs
central cpu costs should be in this conversation.

[1] I'm kind of on a campaign to get people to stop thinking about
mbits/sec and about intervals well below human perception, thus,
gbits/ms - or packets/ns!