BQM on new BT Fibre connection

Greetings all..

I set up a BQM on the new BT Fibre 500mb connection and it's looking like a 'sawtooth'. It's been active for about 3 weeks and remains the same along with those random latency spikes.

All previous BQM's on a copper line have been flat, and without those latency spikes every so often. Is this normal?

I have the same although mine is more regular with both IPv4 & v6. Others have mentioned it too, but so far, I have not heard an explanation.

Would be interesting to see the data behind the graph for a 24 hour period as it may reveal something interesting.

The downloadable XML is not much use as it only generates the graph. I guess MrS or Hohn would need to provide it. If they could I would not object to mine being shared - provided they stripped out te personal details (Ip &c).

I have the same thing happening on my BQM. Also BT FTTP

Never used to happen on my FTTC connection. Base latency on that was always flat. My FTTP on the other hand has this sawtooth effect.

I also have a f8lure graph which looks more flat like my old FTTC one with TBB. You could try a f8lure graph and then report back with an image from that for comparison.

Edited by blue166 (Mon 17-Apr-23 20:42:48)

Interesting. I've just had BT FTTP installed a week ago and although it doesn't appear to sawtooth, it does have a lot of packet loss happening even when idle.

I'll make a fresh post to not clog up this one.

Can any of the admin add to this please. I do wonder what is going on with the Saw tooth effect. I have seen it on a few FTTP BQM's (Mainly Openreach related). It does it on mine too.

I use an ASUS RT-AC86U

As mentioned before the F8lure one doesn't show it. But I dunno...

Thanks.

Edited by blue166 (Sun 21-May-23 11:53:38)

In reply to a post by MHC:

The downloadable XML is not much use as it only generates the graph. I guess MrS or Hohn would need to provide it. If they could I would not object to mine being shared - provided they stripped out te personal details (Ip &c).

The downloadable XML contains the same data we use to generate the graph. We don't have anything else data wise.

In reply to a post by MisterSingh:

I set up a BQM on the new BT Fibre 500mb connection and it's looking like a 'sawtooth'. It's been active for about 3 weeks and remains the same along with those random latency spikes.
All previous BQM's on a copper line have been flat, and without those latency spikes every so often. Is this normal?

https://www.thinkbroadband.com/faq/broadband-quality...
See section under "Why does my graph have a sawtooth effect?"

This is possibly router related - although our FAQ si bas on max latency whilst yours is more minimum latency (the occasional spike up (yellow) isn't per se a cause for concer).

I suspect this may be the router responding to "one ping every second" kind of effect. Other monitoring services may not use the same size icmp packet, and may test in chunks (e.g. some do many pings in a short space, whilst ours is once a second every second). It could also be some QoS or such which an ISP has in its network that resets counter or something but it does sound a bit odd. The variation is quite minort in the bigger scheme of things so probably wouldn't affect most people (a few ms).

If you have another router I'd be keen to see what that shows.
I've checked a bunch of other BT ones which don't show this effect.

Also what router are you on? I'm wondering if there's some QoS setting..

There are a number of us that have reported this wavy sawtooth effect (it is different from the sawtooth in your FAQ). I am using the same Netgear Orbi router as I was on FTTC where the minimum latency line was flat. The only difference I am aware of is that IDNET had me on BTw backhaul on FTTC and my FTTP is a ZenW connection via OR.

This is mine for reference.

In reply to a post by jaydub:

There are a number of us that have reported this wavy sawtooth effect (it is different from the sawtooth in your FAQ). I am using the same Netgear Orbi router as I was on FTTC where the minimum latency line was flat. The only difference I am aware of is that IDNET had me on BTw backhaul on FTTC and my FTTP is a ZenW connection via OR.

This is mine for reference.

Hmmm.. it does seem a bit odd to have this vary by line type. I would be surprised of an ISP level network was traffic shaping anything.. I presume CGNAT is not a possibility here.
I am quite curious about this pattern though.. would like to track it down.

Hi Seb,

I'm on a fixed IP address. I am one of several that have reported this on moving from FTTC to FTTP

See an example here: https://forums.thinkbroadband.com/bqm/t/4731628-re-p...

My F8lure stats are a flat line for the minimum latency, so my gut feel is that it seems to be something specific to the way the TBB monitoring is configured.

As earlier, it is there on mine. BT Business, IPv6 & v4 although "teeth" reversed:

IPv4

IPv6

In reply to a post by MHC:

As earlier, it is there on mine. BT Business, IPv6 & v4 although "teeth" reversed:
IPv4
IPv6

This makes it more likely to the CPE related.

My new FTTP 330/50 with AAISP has this sawtooth effect on the BQM too:

sawtooth BQM

Edited by perlen (Sun 26-Nov-23 18:11:54)