Intermittent slowdowns

[#1]

@Anonymous Could be interesting, but won't solve the Openreach disconnections issue - or whatever is behind it.

[#2]

[#3]

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@jab1 wrote:

@Anonymous Could be interesting, but won't solve the Openreach disconnections issue - or whatever is behind it.

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I agree !

I think there are two problems here,  there are disconnections, and there are slowdowns.

The slowdowns will not be occurring during a period of Openreach disconnection - there would be nothing passing.

The slowdowns are likely to be coincident with the massive PING times as shown in Reply #27

Massive PING times are a symptom of the upload path being saturated with too much traffic.

Having done a quick Google on the VMG8924 router, there are many complaints that the router completely stops passing new traffic connections until either the existing excessive outgoing traffic data stream has completed or the router reboots the DSL connection.

Fortunately I've found an archived user guide for the VMG8924, and the good news is that it appears to support QoS that shows that it might be possible to traffic shape the upstream path, and therefore reduce the chances of the slowdowns.

The bad news is that the Plusnet Hub 2 will also suffer high PING with a lot of outgoing traffic, but does NOT have QoS.

[#4]

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@Anonymous wrote:

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Fortunately I've found an archived user guide for the VMG8924, and the good news is that it appears to support QoS that shows that it might be possible to traffic shape the upstream path, and therefore reduce the chances of the slowdowns.

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Is that this page?

And is there anything I can alter without mucking things up even more?

[#5]

@Anonymous I agree with what you say above, but maybe if the OPs disconnections, and resulting low connection speeds are resolved that could go some way to sorting it,

I won't comment on the ping times, as that has never been a problem for me, so I haven't done much research into them, and know very little.

Very few ISP supplied routers have bells and whistles - I don't even know if my FritzBox supports QoS, and that is definitely not the type of router supplied by mainstream ISPs.

Thanks for your help on this, BTW.

[#6]

@hugonebula  that a great starting point !

If you now navigate to the QoS control page shown below

Lets try getting those LATENCY figures better using some guestimate starting numbers -

Try setting -

        "WAN Managed Upstream Bandwidth" = 750 Kbps

        "LAN Managed Downstream Bandwidth" = 16000 Kbps

        "Upstream Traffic Priority Assigned by" = "Packet Length"

then set

        "QoS" = "Enable"

and press the "Apply" button, and wait for whatever it does next.

Then re-run the  https://www.waveform.com/tools/bufferbloat  test, and post a screenshot of the result.

If this works, it might take a few iterations to get the setting closer to ideal.

[#7]

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@jab1 wrote:

I don't even know if my FritzBox supports QoS

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@jab1  -  What model number is it ?

[#8]

7530

[#9]

@jab1  at first glance that looks impressive, and as far as I can tell it looks like it does QoS automatically by default !

[#10]

@Anonymous

 does the Plusnet Hub 2 GUI have a live graph of traffic going through the modem 

Nothing like one would want. The only two DSL Link down messages I found in the log are for early Nov and Oct, so of no relevance now.

@jab1 

Every time any modem is powered on it will report DSL Link UP, this HUB has been switched off many times recently ONLY two DSL link drops

@hugonebula 

Unless the speed tests and bufferbloat tests are performed on a wired network with no other devices connected there are not really of much help.

High ping can be caused by a week wireless signal, which in turn reduces the connection speed

[#11]

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@Anonymous wrote:

If this works, it might take a few iterations to get the setting closer to ideal.

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That seems to have given me an 'A'! 

I've just tried a YouTube video & a quick iPlayer stream and I can get HD possibly 4K, so all good. 

[#12]

Thanks for that information, @Anonymous . I  haven't played around with it much - its 'out-of-the-box'  settings have suited me just fine. One of the advantages of being with my ISP, they may be a little more expensive than BT/PN/TT/SKY, but their support is very much better - should I need it, which I haven't really for the time I've been with them.

[#13]

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@Dan_the_Van wrote:

@jab1 

Every time any modem is powered on it will report DSL Link UP, this HUB has been switched off many times recently ONLY two DSL link drops

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What about the first of the logs from the Zyxtel @hugonebula posted earlier today - that, unless I am mistaken was a 'today' event, and I assume it hadn't been switched just before then - I could be wrong, and I'm not being difficult - honest 😀.

However, the OPs speeds are still low, with a stupidly low D/S SNR to boot.

All yours for tonight anyway - I have some TV to catch up on.

[#14]

@jab1 

The two post of log files are from the Hub Two. Can you point me to the post for the Zyxtel logs as I think my glasses have failed me, anyway no more from me today either. 

@hugonebula 

Some powerline devices also have QOS do it might worth checking them as well.

[#15]

@hugonebula 

WOW that's an improvement !

Those settings are about as good as you are likely to get with your current sync speeds.

If you are happy with the connection as it is now, do you want to give it a few days of real world use and see how it goes ?

Your limiting factor here is your upload speed,  as most QoS algorithms struggle down at around 700Kbps, so "Upload Active" latency at +24ms is a big win !

If you did want to iterate your settings at all, you might want to increase slowly the QoS downstream bandwidth and re-test, to see if you can increase your download speed test result, but doing so will increase the "Download Active" latency,  and I'd suggest not letting that get beyond +20ms (but in my opinion the +14ms you got is near enough what I'd be happy with).