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-   -   100M : Line quality and jitter (https://www.cableforum.uk/board/showthread.php?t=33689356)

qasdfdsaq 03-09-2012 18:14

Re: Line quality and jitter
 
Quote:

Originally Posted by Chrysalis (Post 35470316)
That suggests to me VM perhaps put higher paying customers on lower populated channels or bump their priority, its interesting to say the least.

I thought I'd explained this already, it's probably nothing to do with channels or priority.

TCP tries to send faster and faster until it hits packet loss. When this eventually exceeds the speed someone is paying for, VM's network starts bufferbloating and then dropping packets.

People on lower speeds are more likely to hit their speed cap and therefore more likely to get their data dropped, simply from normal use.

Chrysalis 05-09-2012 15:49

Re: Line quality and jitter
 
except jitter measurements are not TCP.

I know how TCP works thank you.

qasdfdsaq 05-09-2012 23:41

Re: Line quality and jitter
 
Well then you'll know that TCP and ICMP packets go down the same line and when one fills it up the other will also start getting dropped.

Chrysalis 06-09-2012 20:22

Re: Line quality and jitter
 
Your explanation is assuming the results are affected by people pegging their connections hitting speed caps and getting affected results.

The samknows test only runs when the connection is idle, if its busy then the test is skipped.

qasdfdsaq 07-09-2012 10:55

Re: Line quality and jitter
 
No, I'm saying in any random selection of people doing a random selection of things at random times of day the ones with lower speed caps are more likely to hit speed caps.

The latency and jitter tests run continuously, it's only the speedtests that get "skipped" when the line is busy.

Chrysalis 07-09-2012 16:44

Re: Line quality and jitter
 
on my test device they all skipped if line is busy.

Sephiroth 08-09-2012 12:16

Re: Line quality and jitter
 
Quote:

Originally Posted by qasdfdsaq (Post 35471679)
No, I'm saying in any random selection of people doing a random selection of things at random times of day the ones with lower speed caps are more likely to hit speed caps.

....

Is that right, Qasi? The 30/60/100 cap points are respectively 7/10/20 GB My spreadsheet says that (during the day):

30 meg hits the cap after 31 minutes
60 meg hits the cap after 22 minutes
100 meg hits the cap after 27 minutes

During the evening period, the cap points are halved and those times are:

L30 hits the cap after 16 minutes
XL30 hits the cap after 16 minutes
XL60 hits the cap after 11 minutes
XXL100 hits the cap after 13 minutes

paulsouth 08-09-2012 14:06

Re: Line quality and jitter
 
Quote:

Originally Posted by Sephiroth (Post 35472011)
Is that right, Qasi? The 30/60/100 cap points are respectively 7/10/20 GB My spreadsheet says that (during the day):

30 meg hits the cap after 31 minutes
60 meg hits the cap after 22 minutes
100 meg hits the cap after 27 minutes

During the evening period, the cap points are halved and those times are:

L30 hits the cap after 16 minutes
XL30 hits the cap after 16 minutes
XL60 hits the cap after 11 minutes
XXL100 hits the cap after 13 minutes

wat do u mean by that? by the cap and the mins? i am lost

craigj2k12 08-09-2012 14:37

Re: Line quality and jitter
 
downloading at full speed on each package would trigger STM downloading for those lengths of time

qasdfdsaq 08-09-2012 17:00

Re: Line quality and jitter
 
Quote:

Originally Posted by Sephiroth (Post 35472011)
Is that right, Qasi? The 30/60/100 cap points are respectively 7/10/20 GB My spreadsheet says that (during the day):

The 30/60/100 cap points are respective 33Mbit/sec, 66Mbit/sec and 111MBit/sec.

I'm talking about the connection speed, this discussion has nothing to do with STM.

Sephiroth 08-09-2012 19:24

Re: Line quality and jitter
 
Quote:

Originally Posted by qasdfdsaq (Post 35472108)
The 30/60/100 cap points are respective 33Mbit/sec, 66Mbit/sec and 111MBit/sec.

I'm talking about the connection speed, this discussion has nothing to do with STM.

No they're not the cap points. The cap points are the data thresholds that I posted which trigger the caps.

qasdfdsaq 08-09-2012 22:09

Re: Line quality and jitter
 
I think you're misunderstanding the term speed cap. What you're talking about is completely unrelated.


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