netdev - Re: [Patch net-next] tcp: add a tracepoint for tcp_retransmit

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Date:   Tue, 10 Oct 2017 10:16:21 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [Patch net-next] tcp: add a tracepoint for tcp_retransmit_skb()

On Tue, Oct 10, 2017 at 4:21 AM, Eric Dumazet <edumazet@...gle.com> wrote:
> On Mon, Oct 9, 2017 at 10:35 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> We need a real-time notification for tcp retransmission
>> for monitoring.
>
> Hi Cong
>
> This seems to not be well defined.
>
> For example, why a retransmission triggered by TLP is not traced ?

Oh, it should, seems I should just put the trace in __tcp_retransmit_skb()
instead...

I will update the patch after waiting for other feedbacks.

Thanks.