Re: [tcpm] adoption and implementation of draft-balasubramanian-tcpm-hystartplusplus-03

Vidhi Goel <vidhi_goel@apple.com> Wed, 29 April 2020 22:03 UTC

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From: Vidhi Goel <vidhi_goel@apple.com>
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Cc: Ian Swett <ianswett=40google.com@dmarc.ietf.org>, Yuchung Cheng <ycheng=40google.com@dmarc.ietf.org>, "tcpm@ietf.org Extensions" <tcpm@ietf.org>
To: Junho Choi <junho.choi@gmail.com>
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Subject: Re: [tcpm] adoption and implementation of draft-balasubramanian-tcpm-hystartplusplus-03
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+1 for adoption. I plan to implement this in Apple QUIC which uses Cubic by default later this fall.

Vidhi

> On Apr 29, 2020, at 2:57 PM, Junho Choi <junho.choi@gmail.com> wrote:
> 
> Ian - I implemented for Cloudflare quiche: https://github.com/cloudflare/quiche/pull/476 <https://github.com/cloudflare/quiche/pull/476>
> 
> There is a minor difference due to TCP vs QUIC (see PR desciprion) but in general it's easy to port and works well so far.
> 
> On Wed, Apr 29, 2020 at 12:47 PM Ian Swett <ianswett=40google.com@dmarc.ietf.org <mailto:40google.com@dmarc.ietf.org>> wrote:
> +1 on adoption from me as well.
> 
> I'd be happy to implement this in our QUIC Cubic implementation(which is still the default CC for Chrome QUIC).
> 
> On Wed, Apr 29, 2020 at 3:10 PM Yuchung Cheng <ycheng=40google.com@dmarc.ietf.org <mailto:40google.com@dmarc.ietf.org>> wrote:
> +1 on adoption
> 
> two questions
> 1. RttSampleCount. Since the counter is incremented on a per ACK
> basis, the receiver behavior may significantly influence the actual
> hystart timeline. For example a receiver acking one full cwnd burst vs
> acking every packet (or even every byte). it'd be good to clarify if
> the intended rounds or time-scale in hystart++ design
> 
> 2. "In practice, the Inter- Packet Arrival algorithm does not perform
> well and is not able to detect congestion early, primarily due to ACK
> compression." In my experience, another reason is it relies on packets
> being pushed out in a window of burst in slow start. Therefore in
> paced slow start (e.g. slow_start w/ linux fq/pacing) often produces
> premature exit as well. I am curious if the authors have similar
> experience?
> 
> Lastly, I am a fan of the BBR startup algorithm for obvious reasons.
> The algorithm can be easily ported to produce an ssthresh for
> conventional C.C.. It'd be great to see some words describing the
> difference and even some real comparisons. BBR startup definitely
> requires a lot more states (e.g. to track bw) for example. so there
> are pros & cons.
> 
> On Wed, Apr 29, 2020 at 10:32 AM Martin Duke <martin.h.duke@gmail.com <mailto:martin.h...duke@gmail.com>> wrote:
> >
> > I support adoption of this work.
> >
> > I would also encourage anyone in the WG thinking about implementing this draft to speak up. If this set is not null, I would encourage Praveen to move this draft to the Proposed Standard (preferred) or at least Experimental track.
> >
> > Martin
> > _______________________________________________
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> 
> -- 
> Junho Choi <junho dot choi at gmail.com <http://gmail.com/>>
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