From: Jonathan Morton <chromatix99@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: bloat <bloat@lists.bufferbloat.net>,
ECN-Sane <ecn-sane@lists.bufferbloat.net>
Subject: Re: [Ecn-sane] [Bloat] dropbox, bbr and ecn packet capture
Date: Sun, 26 Apr 2020 03:52:15 +0300 [thread overview]
Message-ID: <85F248E2-E1B5-45A6-8E45-EBCA43B82A09@gmail.com> (raw)
In-Reply-To: <CAA93jw4dh8LrB=Pyq+SDY_npbCVonq+hXbHkLkGP0Pp=1ky2vg@mail.gmail.com>
> On 26 Apr, 2020, at 3:36 am, Dave Taht <dave.taht@gmail.com> wrote:
>
> I just did a rather large dropbox download. They are well known to be
> using bbr and experimenting with bbrv2. So I fired off a capture
> during a big dropbox download...
>
> It negotiated ecn, my fq_codel shaper and/or my newly ath10k
> fq_codel's wifi exerted CE, osx sent back ecn-echo, and the rtt
> results were lovely. However, there is possibly not a causal
> relationship here, and if anyone is bored and wants to scetrace,
> tcptrace or otherwise tear this cap apart, go for it.
Well, the CE response at their end is definitely not Multiplicative Decrease. I haven't dug into it more deeply than that. But they're also not running AccECN, nor are they "proactively" sending CWR to get a "more accurate" CE feedback. I suspect they're running BBRv1 in this one.
- Jonathan Morton
next prev parent reply other threads:[~2020-04-26 0:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-26 0:36 [Ecn-sane] " Dave Taht
2020-04-26 0:52 ` Jonathan Morton [this message]
2020-04-26 3:10 ` [Ecn-sane] [Bloat] " Neal Cardwell
[not found] ` <mailman.79.1587870632.24343.bloat@lists.bufferbloat.net>
2020-04-26 23:33 ` Alexey Ivanov
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