[Bloat] extremely good dslreports result for bufferbloat on free.fr

[jb]

>This got an A+ rating, which I would not have given it, given the
enormous load spike.

I think there will always be the occasional incorrectly graded test,
this one is simply because the median of the downstream latency
ignores the spike. If I used average(), then it would not ignore
the spike, however one very high outlier could also ruin a good result.
After all, pinging anything on the internet can always get the odd
bad response now and again.

If neither average nor median is any good, then there needs to be
a filter function. But what filter? ignoring spikes that are hugely higher
than neighbouring ones? that would fail if there was a spike every 3rd
sample. Open to ideas..

Here is a result from the australian telco free public hotspot:
    http://www.dslreports.com/speedtest/399962

On the side of the hotspot it says 'send us your thoughts about this
free service'. Well my thought is that if one person posted a picture
to Instagram, the whole hotspot would be unusable for as long as it
took to upload. 6 seconds of buffer in there somewhere.

cheers,

On Fri, May 1, 2015 at 4:05 PM, Dave Taht <dave.taht at gmail.com> wrote:

> This got an A+ rating, which I would not have given it, given the
> enormous load spike.
>
> http://www.dslreports.com/speedtest/400387
>
> Imagine if your steering wheel behaved like this.
>
> On Thu, Apr 30, 2015 at 8:10 PM, jb <justin at dslr.net> wrote:
> > Already users are like "how can i fix this!".
>
> The FAQ can be improved.
>
> > I've just replied to one who has lower speeds on the surfboard SB6141
> which
> > is a modem designed for crazy cable speeds. He has an "F" and his
> downstream
> > bloat is terrible, and upstream not much better.
> >
> > I imagine a LOT of people on slower plans have a "recommended" modem like
> > this one.
>
> I have not found a cable modem with less than 250ms bloat at 50mbit/5.
> The docsis 3 ones
> are often in the 800 ms range.
>
> >
> > However most of them will hear that the problems from bloat only happen
> when
> > you reach maximum upload or download speed and will think, well, I can
> live
> > with that, I never run my connection to capacity and I don't upload to
> > offsite backups..
>
> Latency spikes are annoying no matter how they are inflicted, and happen
> all the time on nearly any workload. Your test is testing tcp in steady
> state,
> most web transactions are bursts of dozens to a hundred flows in slow
> start.
>
> It is the business class customers that feel it most often. I have never
> visited a business class cable customer that had reasonable amounts of
> delay
> and jitter during business hours.
>
> After living in  bloat-free universe for quite some time now, annoying
> issues with things like netflix are decreased, voip and videoconferencing
> work all the time, same for games...
>
> it would be hard to create a metric
> for user satisfaction, but every before/after comparison someone
> implementing a solution is quite overjoyed.
>
> https://twitter.com/mnot/status/575581792650018816
>
> >
> > On Fri, May 1, 2015 at 10:48 AM, Rich Brown <richb.hanover at gmail.com>
> wrote:
> >>
> >>
> >> > On Wed, Apr 29, 2015 at 9:33 PM, jb <justin at dslr.net> wrote:
> >> > ...
> >> >> if it did get a rating it would be an "D" or "F"..
> >> >
> >> > How about "E" for error? That can be further explained in the text
> >> > "Sometimes the bloat is so bad that we cannot adaquately test for it -
> >> > and other times there is something else badly wrong with the link that
> >> > we cannot identify."
> >>
> >> I would stay away from a letter grade for that state, since it could
> >> appear to be on the continuum of A+, A, B, C, D, E (?) F...
> >>
> >> Better to give it a "-" or "?" mark. And if they hover over the "?", let
> >> the text show: "Sometimes the bloat is so bad that we cannot adaquately
> test
> >> for it - and other times there is something else badly wrong with the
> link
> >> that we cannot identify."
> >>
> >> Rich
> >
> >
>
>
>
> --
> Dave Täht
> Open Networking needs **Open Source Hardware**
>
> https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
>
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