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Very High Latency

val
Grafter
Posts: 44
Registered: 15-08-2007

Very High Latency

Gawd, I'm getting to old to be shifting furniture and crawling around on my hands and knees! Will do if I have to though :\

I've noticed for the last couple of weeks that browsing and gaming has become very laggy. Download (2-3Mbps) and Upload (0.2-0.3Mbps) are not good, but probably within contract limits. But latency seems to be the real problem.

What I'm hoping is that the following will make enough sense to someone to tell me if I need to start trying to source another router just for testing, etc...

Router stats are:

2017-05-29_14-04_http-www.routerlogin.net.jpg

BT Perfomance tests:

2017-05-29_14-07_Test Result.jpg

and

2017-05-29_14-11_BTW Performance Test.jpg

 

But Pinging BBC:

2017-05-29_14-15_NetStat Agent.jpg

 

or Traceroute to Plus.net:

2017-05-29_14-16_NetStat Agent.jpg

 

Just wondering if anything leaps out as a likely culprit?

17 REPLIES
Plusnet Help Team
Plusnet Help Team
Posts: 4,543
Thanks: 247
Fixes: 111
Registered: 01-01-2012

Re: Very High Latency

We've made some remote changes which should help. Can you monitor it over the next couple of days?

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

Noticed connection went down and back up. Looking loads better already...

2017-05-29_16-11_NetStat Agent.jpg

 

Spoke too soon ... connection went down again and now it's:

2017-05-29_16-15_NetStat Agent.jpg

Plusnet Help Team
Plusnet Help Team
Posts: 4,543
Thanks: 247
Fixes: 111
Registered: 01-01-2012

Re: Very High Latency

Is it still doing it now?

The changes I've made can take time to kick in.

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

It's less consistently bad Smiley

2017-05-29_17-21_NetStat Agent.jpg

2017-05-29_17-26_NetStat Agent.jpg

2017-05-29_17-28_NetStat Agent.jpg

Speed's improved a bit - even 15Mbps download for a while, but it too is very variable now...

2017-05-29_17-31_UK Broadband Speed Test.jpg

2017-05-29_17-35_UK Broadband Speed Test.jpg

Community Veteran
Posts: 4,916
Thanks: 335
Fixes: 16
Registered: 10-06-2010

Re: Very High Latency

Is there any possibility that there's something on your network doing a lot of uploading, perhaps that you are not aware of?

I'm not particularly familiar with those stats from the Netgear, but the WAN Tx B/s of 84,894 looks like most of the upload bandwidth is being used. The uploading would be temporarily interrupted when the connection drops, which would explain why it was better for a short time, until the uploading resumed.

Also it says pppoe, but using PPPoA would be more efficient for ADSL.

val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

When I first noticed the lag, I checked router security & connected devices, and also monitored traffic from my PC. I couldn't see anything that ought not to be there.

You're right, that WAN Tx figure it doesn't look good, but I have no explanation for it - perhaps the router isn't measuring there what we think it's measuring :\

 

val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

Getting some prettier pictures now...

2017-05-29_21-08_NetStat Agent(2).jpg

2017-05-29_21-08_NetStat Agent.jpg

2017-05-29_21-10_UK Broadband Speed Test.jpg

 I'll keep an eye on it over the next couple of days as you suggest.

Thanks for whatever it was you did - curious to know what it was Smiley

 

Plusnet Help Team
Plusnet Help Team
Posts: 4,543
Thanks: 247
Fixes: 111
Registered: 01-01-2012

Re: Very High Latency

Glad to hear it's looking better!

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

The nice results didn't last long; I noticed the next day that speed and latency worsened, and it all seems to have settled again into a quite poor connection.

2017-06-03_15-02_NetStat Agent.jpg2017-06-03_15-03_NetStat Agent.jpg2017-06-03_15-04_UK Broadband Speed Test.jpg

Given that whatever was tweaked during the week had a dramatic effect, does this mean there's some clue as to what's going on?

 

Community Veteran
Posts: 4,916
Thanks: 335
Fixes: 16
Registered: 10-06-2010

Re: Very High Latency

The wider community has no idea of whatever was tweaked. Could you post the current router stats please? What Plusnet may have done is the very generic step of turning off interleaving because it's a latency problem. Interleaving may add an extra fixed amount of latency, typically 10-20ms, but will not be the cause of a few hundred ms latency.

What model of router is it? Is its firmware up to date?

val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

Hi - sorry, I was really just replying to Matthew's suggestion to keep an eye on it, and hoping he'd say what he'd tried (though I realise he's probably off enjoying the weekend at the moment), rather than asking the wider community.

But since you ask, it's a NETGEAR DGND3700 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router, and I updated the router firmware before posting my query, just in case.

2017-06-03_18-23_http-www.routerlogin.net.jpg

The current Noise Margin is less than on Monday.

Whatever Matthew did on Monday had a startling effect on everything, with pings right down from 650ms to 30-40ms, and Up speed back to 14.6Mbps, but by Tuesday it was becoming more variable.

Now pings are consistently around that 450ms mark.

Community Veteran
Posts: 4,916
Thanks: 335
Fixes: 16
Registered: 10-06-2010

Re: Very High Latency

Based on the different speeds and downstream noise margin, I'll assume that the changes are as I suspected, that interleaving was switched off, plus the downstream target SNRM was reduced to 3 dB to give more bandwidth. Interleaving can't cause 450ms ping times, so I think the temporary fix was either coincidental or due to the connection drop rather than any changed ADSL parameters.

Perhaps Plusnet can check how much the connection is being used.

Plusnet Help Team
Plusnet Help Team
Posts: 4,543
Thanks: 247
Fixes: 111
Registered: 01-01-2012

Re: Very High Latency

The SNR margin was at 3db before and I increased it to 6db but bizarrely it seems to have gone back.

I've made the changes again and this time they should stay in place.

 

 

If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
val
Grafter
Posts: 44
Registered: 15-08-2007

Re: Very High Latency

Hi Matthew - the connection remains pretty awful, and I have no idea why.

The router remains on around 6db up and down...

2017-06-12_12-01_http-www.routerlogin.net.jpg

And BT performance tests seem tolerable...

2017-06-12_12-01_BTW Performance Test.jpg2017-06-12_11-59_Test Result.jpg

But latency is still abysmal, and up and down speed test results are poor most of the time...2017-06-12_11-57_UK Broadband Speed Test.jpg

2017-06-12_12-02_NetStat Agent(2).jpg2017-06-12_12-02_NetStat Agent.jpg

What more can be done to isolate the issue?