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High bufferbloat, low downstream levels

Hi, realize there's not really much I can do about this due to the current situation/engineer couldn't come out etc.

Been having constant issues with massive ping spikes/packet loss etc, found out I was getting 400ms bufferbloat again. We bought a netgear orbi setup to see if this would fix - it's fixed the lower than advertised speeds on Virgin (we're now getting 380mbit/s)... but the bufferbloat and the low downstream power is still an issue.

Please see below for the downstream/upstream. Thank you!

Spoiler
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1539000000-937256 qam17
2411000000-7.937256 qam1
3419000000-7.738256 qam2
4427000000-7.738256 qam3
5435000000-838256 qam4
6443000000-7.938256 qam5
7451000000-838256 qam6
8459000000-8.238256 qam7
9467000000-838256 qam8
10475000000-8.238256 qam9
11483000000-838256 qam10
12491000000-7.738256 qam11
13499000000-7.738256 qam12
14507000000-8.537256 qam13
15515000000-8.437256 qam14
16523000000-8.238256 qam15
17531000000-9.237256 qam16
18547000000-8.937256 qam18
19555000000-9.537256 qam19
20563000000-8.937256 qam20
21571000000-8.737256 qam21
22579000000-9.737256 qam22
23587000000-9.737256 qam23
24595000000-9.737256 qam24


Downstream bonded channelsChannel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked37.6100
2Locked37.6170
3Locked38.960
4Locked38.6110
5Locked38.680
6Locked38.680
7Locked38.690
8Locked38.680
9Locked38.690
10Locked38.680
11Locked38.6220
12Locked38.6260
13Locked38.6140
14Locked37.360
15Locked37.670
16Locked38.6110
17Locked37.650
18Locked37.6150
19Locked37.660
20Locked37.6150
21Locked37.6130
22Locked37.3130
23Locked37.6250
24Locked37.680




Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1603000745.4512064 qam6
2537001375.4512064 qam7


Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1ATDMA0000
2ATDMA0000
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Re: High bufferbloat, low downstream levels

Your downstream power levels are on the low side, and you only have two upstream channels, when the norm is four.

A VM staff member will need to investigate further, and an enginner visit may be required.

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Re: High bufferbloat, low downstream levels

Thanks Carl.

Will wait until VM staff see this! 

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Re: High bufferbloat, low downstream levels

Thanks for the post Fkh00.

 

We can see some power level issues there so I'll pop you over a private message now so we can book an engineer appointment.

 

Thanks, Emily.

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Re: High bufferbloat, low downstream levels

So, engineer came out and power levels are now avg -2 down and 50 up. 

However I'm still getting bufferbloat issues. Plugged into the superhub 3 in router mode, it's around 1000MS bufferbloat. Plugged into my Orbi with the SH3 in modem mode, it's around 200-400ms. Perhaps the issue is the superhub? 

I have been messing around with PingPlotter trying to find any reason why I keep getting these bufferbloat related pingspikes.

Using this to look at a few addresses, I can see that my main issue is one of the hops has insane ping spikes, avg 148 and max 1021. The IP of that hop is 212.250.14.50 / 50-14-250-212.static.virginm.net DNS name. :

vgctg1x1

I don't know whether or not this is related to my cable line, or if it's related to virgin media's infrastructure in my road. But there's clearly an issue that the power level fix hasn't fixed!

Thanks

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Re: High bufferbloat, low downstream levels

Hi Fkh00,

 

Thank you for reaching out to us in our community and a warm welcome to you, I am sorry to hear you are still having issues with your connection, so I can help further I will send you an invite into a private chat, please click on the purple envelope to accept.]

 

 

Regards

 

Paul.

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