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Author Topic: Latency differences between lines during flatout download  (Read 554 times)

Weaver

  • Kitizen
  • ****
  • Posts: 4004
  • Retd sw dev; A&A; 3 7km ADSL2; IPv6; Firebrick
Latency differences between lines during flatout download
« on: March 13, 2017, 08:25:46 AM »

Latency comparison: For some reason, my latency figures as shown on the clueless.aa.net.uk CQM graphs are very different  when comparing lines while doing a flat-out download. Line 1 is the fastest line, with a downstream sync rate of ~2800 kbps and line 4 a little slower at ~2600 k for some unknown reason.

(Line 3 is down following the lightning strike last Wednesday and I've been too groggy to properly organise things with my ISP, Andrews and Arnold, and get it sorted out.)

Hopefully this is a picture of the clueless CQM graphs (all-red line 3 is down):
    https://flic.kr/p/SHjhAz

The latencies are:
  *   Line 1:
   max 300-350 ms
   avg 190 ms !!
   min 40 ms

 *   Line 4:
   max 340-390 ms
   avg ~25 ms !!
   min ~25 ms

So the question is, why so different?
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Chrysalis

  • Content Team
  • Kitizen
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  • Posts: 4983
Re: Latency differences between lines during flatout download
« Reply #1 on: March 13, 2017, 10:13:22 AM »

is line 4 new? I thought you had 3 lines.
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Sky Fiber Pro - Billion 8800NL bridge & PFSense BOX running PFSense 2.4 - ECI Cab

Weaver

  • Kitizen
  • ****
  • Posts: 4004
  • Retd sw dev; A&A; 3 7km ADSL2; IPv6; Firebrick
Re: Latency differences between lines during flatout download
« Reply #2 on: March 13, 2017, 10:30:50 AM »

@chrysalis - apologies, still three DSL lines. For hysterical reasons the lines are numbered a.1, a.3 and a.4, and I can't work out how to renumber them and keeps confusing things. I can't remember what the story was about #2 - could be a non-DSL pipe, such as 4G service to one of my SIMs.
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huwwatkins

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  • Posts: 72
Re: Latency differences between lines during flatout download
« Reply #3 on: March 13, 2017, 02:22:36 PM »

Is line 1 the slower of the two?
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Weaver

  • Kitizen
  • ****
  • Posts: 4004
  • Retd sw dev; A&A; 3 7km ADSL2; IPv6; Firebrick
Re: Latency differences between lines during flatout download
« Reply #4 on: March 13, 2017, 03:57:28 PM »

Line 1 is ~200kbps faster downstream sync. (About ~2800 kbps as opposed to ~2600 kbps.)
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