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Date:   Tue, 12 Feb 2019 18:49:02 -0800
From:   Alexei Starovoitov <>
To:     Eric Dumazet <>
Cc:     Yafang Shao <>,
        Eric Dumazet <>,
        Daniel Borkmann <>,
        Alexei Starovoitov <>,
        Yonghong Song <>, Lawrence Brakmo <>,
        David Miller <>,
        netdev <>,
        LKML <>,
Subject: Re: [bpf-next 1/2] tcp: replace SOCK_DEBUG() with tcp_stats()

On Tue, Feb 12, 2019 at 6:15 PM Eric Dumazet <> wrote:
> Do not add more debugging stuff unless you can demonstrate
> they actually allowed you to find a real bug and that you sent a
> public fix for it.
> Just adding "cool stuff" in TCP stack does not please me, it is only
> more complexity for unproven gain.

I agree.
I don't see why this debugging of 'abnormal TCP' cannot be done
with kprobes and tracepoints.
Instrumenting every tcp counter increment is overkill.

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