Yes still issues. Still no fix.

In reply to a post by Kamil:

Thank you all. I shall do the search re SVLAN.

It does not affect the btw test so I have no solid proof apart from my real time feeling when downloading test file or doing TBB speed test.

Aaaargh seems like it will have to get much worse before it can get better.

You are really great thanks again for your time guys

Last week for a few days i was seeing a jitter fest that was apparent during office hours and evening peak time, the single threaded test on tbb was showing lower results upto 50% lower at times , but the zen speed test i was near normal, my connection joins the Zen network at Manchester , their speedtester is also in Manchester ,So it was caused by something on the london side of their network imo

I have also in the past have had peak time congestion issues caused by BTW's Svlan's being run to their max , the last two instances Zen have been my isp, and can report both times they did escalate this with the correct part of BTW who didn't argue,and swapped me onto a different Svlan , though you do have to provide Zen with sufficient evidence TAP3's ect before they will get onto BT ,

I dont know if I am just lucky on good gateway or what but its day 3 and the connection is holding pretty good.

http://www.thinkbroadband.com/speedtest/button/14611...


Can some other folks please share their most recent experience also.

I am not restarting this modem ever again

Hi guys,
Apologies to revive this thread up, but I see similarities with my issues, so wondered if I could have the same problem going on (that I only partially understand from reading this!). Is the problem described and sorted in this thread the sort of thing that was fixed for individuals, individual exchanges, or should it have been sorted overall across the network, making this not likely to be my problem?

I'm FTTC, on Bristol North exchange, which is listed as having Zen LLU on samknows (which I believe means they have their own backhaul). Samknows gives me 73-80mbps downstream / 20 upstream estimate.

I have found in recent months (6-9 maybe longer), that web browsing feels sluggish, lethargic, and a bit laggy - enough for my wife to notice the 'internet is a bit slow'. Yet sustained downloading speeds of files is good, and when I've tested on speedtest.net or something all looks good (prob slower than when I first got the fibre 2yrs ago though).

However, now I've used the thinkbroadband and zen's own speedchecker (which says thinkbroadband on it), it reveals this slower single threaded speed (and inconsisten/all over the place) that people have described here, with the 6x thread being ok (not perfect). This is regardless of time of day/middle of night.
Typical readout in middle of day:
https://s32.postimg.org/hm9smagid/speed201606241328.png
https://postimg.org/image/5x5sybpjl/

My thoughts/questions:
When would Zen have introduced the backhaul to the exchange? Could this coincide with when performance dropped, and would that make sense? Is this the cause (or related to the cause) of the lagginess? Is this something I could talk to Zen about? Could it be related to what's on this thread? If so, how do summarise describe this to help them if I call up?

Thanks for your thoughts!

Leftfield maybe but have you investigated bufferbloat?

Navigate to DSLReports and run their speed test, this will give you more info.

For reference, I recently investigated and changed config to drastically reduce bufferbloat (which will give you sluggish web browsing) and I instantly noticed the improvement as you'd expect. That improvement remains some weeks later.

To save you some time, you can use QoS settings in your gateway/ modem/ router to improve bufferbloat. Essentially, set the uplink rate to just below what your best speedtest results have shown.

Paul

Thanks for the reply. I haven't ever looked into bufferbloat.

DSLReports:
http://www.dslreports.com/speedtest/4258694
Grading: BufferBloat A, Quality C, Speed C

Does that suggest bufferbloat isn't a problem? Is the Quality/Speed grading to do with bufferbloat, or something else?

I have a Buffalo WZR-1166DHP, with QOS setup.
Will start doing more research on bufferbloat!

Bufferbloat stats look very good. Mine comes in at 'C' with an original stat of 'F' before the QoS changes. Browsing is how I would expect now. I.e. as good as instant to change pages/ searches. I should state that I perform these tests over a WiFi connection.

'Quality' relates to the average detected packet loss/ re-transmit percentages during the download part of the test. So you're getting '5% or less' for that measure. Mine comes in at A every time, which is '1% or less'. So that might be some indication of your issue.
I wouldn't worry about the 'Speed' rating as that's just a measure compared against everyone else who runs the test.

Paul

Edited by deleted (Sun 26-Jun-16 21:49:13)

Ok, thanks for the info. So if I'm not looking at buffer bloat, and may be looking more at packet loss/quality, and given that my speed tests generally look like:
https://s32.postimg.org/hm9smagid/speed201606241328.png
with inconsistent/poor single thread speed, yet pretty good 6x thread speed (though not quite as much as I'd expect or it was originally before things became more sluggish), any idea where/how I should further work out the problem?

After talking to my wife, she's pretty certain as well that it suddenly became not as sharp one day, and has mainly stayed that way. Pages definitely don't load instantly, which was how I remembered things being when I first went onto fibre on this line 2yrs ago with Zen. I'd sort of wondered if my standards had just gone up, but have gone off that idea now!

Having a quick read around, packet loss can be caused by: network congestion, overworked routers and switches, slow round trip times, or possibly a result of traffic prioritisation schemes used by service providers or the company hosting the site you are trying to access.

So there's a few things to investigate there. I wonder if congestion = contention. Maybe a load of new homes switched to FTTC in your area around the time of the slowdown...

Paul