netdev - Re: [RFC PATCH bpf-next] bpf: Introduce bpf

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Message-ID: <bcbf76c3-34d4-d550-1648-02eda587ccd7@mojatatu.com>
Date:   Tue, 25 May 2021 15:35:29 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, kernel-team <kernel-team@...com>
Subject: Re: [RFC PATCH bpf-next] bpf: Introduce bpf_timer

On 2021-05-25 2:21 p.m., Alexei Starovoitov wrote:
> On Mon, May 24, 2021 at 9:59 PM Cong Wang <xiyou.wangcong@...il.com> wrote:


[..]
> In general the garbage collection in any form doesn't scale.
> The conntrack logic doesn't need it. The cillium conntrack is a great
> example of how to implement a conntrack without GC.

For our use case, we need to collect info on all the flows
for various reasons (one of which is accounting of every byte and
packet).
So as a consequence - built-in GC (such as imposed by LRU)
cant interfere without our consent.

cheers,
jamal