linux-kernel - Re: [PATCH net-next v4 4/4] net: tcp: refactor the dbg message in tcp_retransmit

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Message-ID: <CANn89iLYPk1VpcOACBki6CE82nPp9vD7akZSbBYD+-BVb_0zBQ@mail.gmail.com>
Date:   Fri, 11 Aug 2023 09:38:42 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     menglong8.dong@...il.com
Cc:     ncardwell@...gle.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, dsahern@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, flyingpeng@...cent.com,
        Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH net-next v4 4/4] net: tcp: refactor the dbg message in tcp_retransmit_timer()

On Fri, Aug 11, 2023 at 5:01 AM <menglong8.dong@...il.com> wrote:
>
> From: Menglong Dong <imagedong@...cent.com>
>
> The debug message in tcp_retransmit_timer() is slightly wrong, because
> they could be printed even if we did not receive a new ACK packet from
> the remote peer.
>
> Change it to probing zero-window, as it is a expected case now. The
> description may be not correct.
>
> Adding the duration since the last ACK we received, and the duration of
> the retransmission, which are useful for debugging.
>
> And the message now like this:
>
> Probing zero-window on 127.0.0.1:9999/46946, seq=3737778959:3737791503, recv 209ms ago, lasting 209ms
> Probing zero-window on 127.0.0.1:9999/46946, seq=3737778959:3737791503, recv 404ms ago, lasting 408ms
> Probing zero-window on 127.0.0.1:9999/46946, seq=3737778959:3737791503, recv 812ms ago, lasting 1224ms

Reviewed-by: Eric Dumazet <edumazet@...gle.com>