[Bloat] Latency Measurements in Speed Test suites (was: DOCSIS 3+ recommendation?)

Pedro Tumusok pedro.tumusok at gmail.com
Mon Mar 30 21:30:41 EDT 2015

Justin has signed up for this list, I will just copy the question he sent
me directly over at DSLReports and let you  chime in with your views.


I've subscribed to the list.

Currently the 'saturation' meter is pinging away at an unrelated server (
probably it should ping away, and with higher frequency, at one of the
servers streaming data in? because then there are more likely to be filled
buffers en-route?
or are the bloated buffers mainly at the customer end of the experience.

I can make the saturation meter display RTT directly, and continue during
the test as an preference. I don't really want to have it pinging away
during the test because it probably slows the result down. Actually I'll
have to check that. Definitely on slow lines it would (like GPRS and 3G).

tcptrace on the server side of one stream would immediately reveal average
and peak RTT and more. I wonder if that is the goal to be shooting for
rather than these more indirect measurements.

What is the buffer bloat opinion on the ESNet page?

»fasterdata.es.net/network-tuning ··· r-bloat/

they say more not less buffers are needed for 10gig, and its only a problem
with residential.

On Mon, Mar 30, 2015 at 4:20 PM, Pedro Tumusok <pedro.tumusok at gmail.com>

> On Mon, Mar 30, 2015 at 4:18 PM, Jonathan Morton <chromatix99 at gmail.com>
> wrote:
>> > On 30 Mar, 2015, at 16:56, Pedro Tumusok <pedro.tumusok at gmail.com>
>> wrote:
>> >
>> > Also would you mind doing another test and share the link for result,
>> so he can check closer?
>> I still have the result link for the earlier one:
>>         http://www.dslreports.com/speedtest/193440
>> Here’s another result without using the webcache, but keeping everything
>> else the same:
>>         http://www.dslreports.com/speedtest/199524
>> For context, this is through the PowerBook which is running cake, 8Mbps
>> down and 1Mbps up.  This is somewhat less than the capacity of the link,
>> but since it’s 3G it varies quite a lot anyway.
>> > on the other things, yes I'd like to hear about buffer bloat ideas.
>> The number-one desirable feature is to carry on measuring the latency
>> while the throughput test is ongoing.  This is relevant to anyone who wants
>> to make a VoIP call or play an online game while using the connection for
>> something else.  If you have several people in one household, it’s often
>> hard to coordinate their activity to avoid such multitasking.
>>  - Jonathan Morton
> I will forward it to him, hopefully he will signup here also, so the smart
> people can talk to each other and not having me mess it up :)
> --
> Best regards / Mvh
> Jan Pedro Tumusok

Best regards / Mvh
Jan Pedro Tumusok
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