Why you don't get the whole 100mbps in UFB and Why it's capped to 100mbps only??

Forums › New Zealand Broadband › Why you don't get the whole 100mbps in UFB and Why it's capped to 100mbps only??

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mercutio

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#841826 23-Jun-2013 01:04

Talkiet:
mercutio: another thing to keep in mind that speedtest.net isn't accurate at gigabit speeds.

it won't even show a result link for speeds above 1 gigabit.

speedtest.net is an estimate of peak speeds at the best of times.

Go read how they calculate the numbers they present you...
Not saying they don't usually get it close to POTENTIAL peak speed, but it's NOT a measure of volume over time.

Cheers - N

ahh do you have a link? i have found speedtest.net overestimates adsl connections sometimes..

Talkiet

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#841827 23-Jun-2013 01:06

mercutio:
Talkiet:
mercutio: another thing to keep in mind that speedtest.net isn't accurate at gigabit speeds.

it won't even show a result link for speeds above 1 gigabit.

speedtest.net is an estimate of peak speeds at the best of times.

Go read how they calculate the numbers they present you...
Not saying they don't usually get it close to POTENTIAL peak speed, but it's NOT a measure of volume over time.

Cheers - N

ahh do you have a link? i have found speedtest.net overestimates adsl connections sometimes..

It's not hidden... Well, not ACTUALLY hidden - you do need to click a few "how we work" type links but they DO document in principle how they calculate the displayed speeds. Finding it is left as an exercise for the reader :-)

Cheers - N

Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.

mercutio

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#841828 23-Jun-2013 01:09

Talkiet:
It's not hidden... Well, not ACTUALLY hidden - you do need to click a few "how we work" type links but they DO document in principle how they calculate the displayed speeds. Finding it is left as an exercise for the reader :-)

Cheers - N

https://support.speedtest.net/entries/20862782-How-does-the-test-itself-work-How-is-the-result-calculated-

Ahh found it.

insane

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#841829 23-Jun-2013 01:26

mercutio:you sure it can do 99 megabit udp?

Unless the numbers are lying (and assuming the laws of physics weren't being broken) I've seen 990mbps over a gig circuit between Auckland and Christchurch, UDP jperf test. I remember as I caused heavily degraded service / near total outage for the customers sharing bandwidth on the link..... yeah not my finest work :D

I've also watched Vector do end to end circuit testing with their hideously expensive test equipment with similar results, but in either cases they weren't UFB connections, they were 'real' ones :-)

mercutio

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#841830 23-Jun-2013 01:31

insane:
mercutio:you sure it can do 99 megabit udp?

Unless the numbers are lying (and assuming the laws of physics weren't being broken) I've seen 990mbps over a gig circuit between Auckland and Christchurch, UDP jperf test. I remember as I caused heavily degraded service / near total outage for the customers sharing bandwidth on the link..... yeah not my finest work :D

I've also watched Vector do end to end circuit testing with their hideously expensive test equipment with similar results, but in either cases they weren't UFB connections, they were 'real' ones :-)

with 1500 mtu?

i wonder if windows iperf improved for udp. anyway, i was referring to ufb rather than ethernet.

for ethernet this looks accurate:

http://serverfault.com/questions/266540/what-is-theoretical-maximum-of-tcp-traffic-over-gigaethernet

It's listing 941 megabit for tcp:

>>> (1500-20-20-12)/(1500+14+4+7+1+12.0)*1000000000/1000000.0
941.48244473342
>>> (1500-20-20)/(1500+14+4+7+1+12.0)*1000000000/1000000
949.2847854356306

And I'm not using tcp/ip timestamps so i took the 12 off, and i'm getting max speed with tcp/ip on lan.

it lists udp as 957.087 megabit. although their 9k results sound more close to what you were getting.

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