netdev - Re: [PATCH v4 net-next 16/16] tcp_bbr: add BBR congestion control

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Date:   Tue, 20 Sep 2016 14:50:39 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, Van Jacobson <vanj@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Nandita Dukkipati <nanditad@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH v4 net-next 16/16] tcp_bbr: add BBR congestion control

On Tue, Sep 20, 2016 at 2:48 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Mon, 19 Sep 2016 23:39:23 -0400
> Neal Cardwell <ncardwell@...gle.com> wrote:
>
> > +/* INET_DIAG_BBRINFO */
> > +
> > +struct tcp_bbr_info {
> > +     /* u64 bw: max-filtered BW (app throughput) estimate in Byte per sec: */
> > +     __u32   bbr_bw_lo;              /* lower 32 bits of bw */
> > +     __u32   bbr_bw_hi;              /* upper 32 bits of bw */
> > +     __u32   bbr_min_rtt;            /* min-filtered RTT in uSec */
> > +     __u32   bbr_pacing_gain;        /* pacing gain shifted left 8 bits */
> > +     __u32   bbr_cwnd_gain;          /* cwnd gain shifted left 8 bits */
> > +};
> > +
>
> I assume there is a change to iproute (ss) to dump this info?

Yes, we have a patch for iproute2 (inet_diag.h and ss.c), which we've
been using. We'll send that out ASAP.

thanks,
neal