[Bloat] [LibreQoS] the grinch meets cloudflare's christmas present

MORTON JR., AL acmorton at att.com
Fri Jan 6 11:38:02 EST 2023

> -----Original Message-----

> From: LibreQoS <libreqos-bounces at lists.bufferbloat.net> On Behalf Of Dave Taht

> via LibreQoS

> Sent: Wednesday, January 4, 2023 12:26 PM

> Subject: [LibreQoS] the grinch meets cloudflare's christmas present


> Please try the new, the shiny, the really wonderful test here:

> https://urldefense.com/v3/__https://speed.cloudflare.com/__;!!BhdT!iZcFJ8WVU9S<https://urldefense.com/v3/__https:/speed.cloudflare.com/__;!!BhdT!iZcFJ8WVU9S9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKVw$>

> 9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKVw$<https://urldefense.com/v3/__https:/speed.cloudflare.com/__;!!BhdT!iZcFJ8WVU9S9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKVw$>


> I would really appreciate some independent verification of

> measurements using this tool. In my brief experiments it appears - as

> all the commercial tools to date - to dramatically understate the

> bufferbloat, on my LTE, (and my starlink terminal is out being

> hacked^H^H^H^H^H^Hworked on, so I can't measure that)


Hi Dave, I made some time to test "cloudflare's christmas present" yesterday.

I'm on DOCSIS 3.1 service with 1Gbps Down. The Upstream has a "turbo" mode with 40-50Mbps for the first ~3 sec, then steady-state about 23Mbps.

When I saw the ~620Mbps Downstream measurement, I was ready to complain that even the IP-Layer Capacity was grossly underestimated.  In addition, the Latency measurements seem very low (as you asserted), although the cloud server was “nearby”.

However, I found that Ookla and the ISP-provided measurement were also reporting ~600Mbps! So the cloudflare Downstream capacity (or throughput?) measurement was consistent with others. Our UDPST server was unreachable, otherwise I would have added that measurement, too.

The Upstream measurement graph seems to illustrate the “turbo” mode, with the dip after attaining 44.5Mbps.

UDPST saturates the uplink and we measure the full 250ms of the Upstream buffer. Cloudflare’s latency measurements don’t even come close.


[Screen Shot 2023-01-05 at 5.54.26 PM.png][Screen Shot 2023-01-05 at 5.54.53 PM.png][Screen Shot 2023-01-05 at 5.55.39 PM.png]

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