Thanks! And sorry that I missed the sample code in the patch. On Mon, Sep 26, 2016 at 12:30 Neal Cardwell <ncardw...@google.com> wrote:
> On Mon, Sep 26, 2016 at 2:47 PM, Aaron Wood <wood...@gmail.com> wrote: > > Dumb question on this: The tcp_bbr_info struct for a socket can be > > inspected at runtime through the ss utility or through a get socket opts > > call, right? > > Yes, you can use either approach: > > (1) from code you can use TCP_CC_INFO socket option; there is sample > code in the original kernel patch for TCP_CC_INFO: > https://patchwork.ozlabs.org/patch/465806/ > > (2) from ss: if you download and build the net-next branch of the > iproute2 package: > > http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/log/?h=net-next > then you will get support to print out the main parameters for a BBR > connection, eg: > > The patch with BBR support for ss is here: > > http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?h=net-next&id=2f0f9aef94129643133363b4503468cdccc481cc > > As the commit notes, the BBR output looks like: > bbr:(bw:1.2Mbps,mrtt:18.965,pacing_gain:2.88672,cwnd_gain:2.88672) > > Hope that helps, > neal > > > > > -Aaron > > > > On Sat, Sep 17, 2016 at 11:34 AM, Maciej Soltysiak <mac...@soltysiak.com > > > > wrote: > >> > >> Hi, > >> > >> Just saw this: https://patchwork.ozlabs.org/patch/671069/ > >> > >> Interested to see how BBR would play out with things like fq_codel or > >> cake. > >> > >> "loss-based congestion control is unfortunately out-dated in today's > >> networks. On > >> today's Internet, loss-based congestion control causes the infamous > >> bufferbloat problem" > >> > >> So, instead of waiting for packet loss they probe and measure, e.g. when > >> doing slow start (here called STARTUP) they don't speed up until packet > >> loss, but slow down before reaching estimated bandwidth level. > >> > >> Cake and fq_codel work on all packets and aim to signal packet loss > early > >> to network stacks by dropping; BBR works on TCP and aims to prevent > packet > >> loss. > >> > >> > >> Best regards, > >> Maciej > >> > >> > >> _______________________________________________ > >> Cerowrt-devel mailing list > >> Cerowrt-devel@lists.bufferbloat.net > >> https://lists.bufferbloat.net/listinfo/cerowrt-devel > >> > > > > > > _______________________________________________ > > Cerowrt-devel mailing list > > Cerowrt-devel@lists.bufferbloat.net > > https://lists.bufferbloat.net/listinfo/cerowrt-devel > > >
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