netdev - Re: [PATCH v5 2/2] tcp: Add snd_wnd to TCP

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Message-ID: <CADVnQykBFBU5bFLXRr_aRzxNVpNGQRtELG5kd6viGWqO0uyyng@mail.gmail.com>
Date:   Sat, 14 Sep 2019 11:45:05 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Thomas Higdon <tph@...com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Dave Jones <dsj@...com>, Eric Dumazet <edumazet@...gle.com>,
        Dave Taht <dave.taht@...il.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH v5 2/2] tcp: Add snd_wnd to TCP_INFO

On Fri, Sep 13, 2019 at 7:23 PM Thomas Higdon <tph@...com> wrote:
>
> Neal Cardwell mentioned that snd_wnd would be useful for diagnosing TCP
> performance problems --
> > (1) Usually when we're diagnosing TCP performance problems, we do so
> > from the sender, since the sender makes most of the
> > performance-critical decisions (cwnd, pacing, TSO size, TSQ, etc).
> > From the sender-side the thing that would be most useful is to see
> > tp->snd_wnd, the receive window that the receiver has advertised to
> > the sender.
>
> This serves the purpose of adding an additional __u32 to avoid the
> would-be hole caused by the addition of the tcpi_rcvi_ooopack field.
>
> Signed-off-by: Thomas Higdon <tph@...com>
> ---
> changes since v4:
>  - clarify comment

Acked-by: Neal Cardwell <ncardwell@...gle.com>

Thanks!

neal