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From: Geoff Huston <gih@apnic.net>
To: "Bless, Roland (TM)" <roland.bless@kit.edu>
Cc: Dave Taht <dave.taht@gmail.com>, bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] geoff huston's take on BBR
Date: Wed, 13 Jun 2018 09:02:43 +1000	[thread overview]
Message-ID: <4E4AF97A-8B22-4355-AF63-B27529F22D94@apnic.net> (raw)
In-Reply-To: <a96cf764-a5aa-c79d-293b-2e3511917f8b@kit.edu>



> On 13 Jun 2018, at 1:58 am, Bless, Roland (TM) <roland.bless@kit.edu> wrote:
>> 
>> no - I started the flows at 10, 20 and 30 seconds after the initial flow started.
> 
> This is nevertheless advantageous for BBR, since it performs its
> ProbeRTT phase every 10s. So using 11, 23, and 34 seconds may
> make a difference in convergence speed (that was at least observed
> in our experiments).


I’m not sure that I follow this - It was my understanding that BBR used the RTT interval as its control timer, and maintained a constant send rate for 6 successive RTTY intervals, then inflated the sending r4ate by 25% for the next RTT interval and deflated it by the same amount for the next RTT interval. I don’t believe that there is any absolute timer in BBR along the lines of a 10 second timer that you appear to be suggesting here.

regards,

   Geoff


  reply	other threads:[~2018-06-12 23:03 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-12  6:55 Dave Taht
2018-06-12  7:49 ` Geoff Huston
2018-06-12 11:25   ` Dave Taht
2018-06-12 15:58   ` Bless, Roland (TM)
2018-06-12 23:02     ` Geoff Huston [this message]
2018-06-13  7:56       ` Bless, Roland (TM)
2018-06-12 22:28   ` Greg White
2018-06-12 23:04     ` Anna Brunstrom
2018-06-12 14:29 ` Jim Gettys
  -- strict thread matches above, loose matches on Subject: below --
2018-06-11 21:27 Dave Taht
2018-06-12  0:42 ` Toke Høiland-Jørgensen
2018-06-12  5:09   ` Matthias Tafelmeier
2018-06-12  7:36     ` Bless, Roland (TM)
2018-06-12 11:40       ` Dave Taht
2018-06-12 12:00         ` Dave Taht
2018-06-12 17:06       ` Matthias Tafelmeier
2018-06-12  5:58 ` Kevin Darbyshire-Bryant

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