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Theagg
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Packet loss and latency spikes

Having mostly solved the speed issues I was having with my Vivid 350 (the technician fitted an attenuator which brought my downstream and upstream power levels back into optimum ranges) I have been running the Hub 3 in modem mode, with a TP Link Archer C7 as the router. (QoS off, Nat Boost on)

However, I'm seeing an awful lot of packet loss and latency spikes since doing that, so any suggestions as to what might be up. The BQM graph here certainly doesn't look as healthy as some I have seen posted on forums here..(this via wired connection) which may explain the occasional speed dips that still plagues me, though nowhere near as bad as before the attenuator was fitted. (For example this dramatic but short lived blip of a speed drop https://www.speedtest.net/result/8262856401)

 

bqm1.jpgbqm1

 

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Theagg
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Re: Packet loss and latency spikes

one upstream has dropped to 16qam I note

Channel

Frequency (Hz)

Power (dBmV)

Symbol Rate (ksps)

Modulation

Channel ID

1

35800000

3.675

5120

64 qam

6

2

27399825

3.6710000000000002

5120

16 qam

7

3

53699938

3.725

5120

64 qam

8

4

45800000

3.675

5120

64 qam

5

      

Channel

Frequency (Hz)

Power (dBmV)

SNR (dB)

Modulation

Channel ID

1

298750000

-1.5

40

256 qam

21

2

170750000

-0.7

40

256 qam

5

3

178750000

-0.5

40

256 qam

6

4

186750000

-0.5

40

256 qam

7

5

194750000

-0.5

40

256 qam

8

6

202750000

-0.7

40

256 qam

9

7

210750000

-0.7

40

256 qam

10

8

218750000

-0.7

40

256 qam

11

9

226750000

-0.9

40

256 qam

12

10

234750000

-0.9

40

256 qam

13

11

242750000

-1.2

40

256 qam

14

12

250750000

-1.4

40

256 qam

15

13

258750000

-1.5

40

256 qam

16

14

266750000

-1.5

40

256 qam

17

15

274750000

-1.7

40

256 qam

18

16

282750000

-1.5

40

256 qam

19

17

290750000

-1.7

40

256 qam

20

18

306750000

-1.5

40

256 qam

22

19

314750000

-1.5

40

256 qam

23

20

322750000

-1.5

40

256 qam

24

21

402750000

-1.5

40

256 qam

25

22

410750000

-1.4

40

256 qam

26

23

418750000

-1.5

40

256 qam

27

24

426750000

-1.5

40

256 qam

28

Channel

Locked Status

RxMER (dB)

Pre RS Errors

Post RS Errors

1

Locked

40.3

18

0

2

Locked

40.3

6

0

3

Locked

40.3

23

0

4

Locked

40.3

23

0

5

Locked

40.9

17

0

6

Locked

40.3

15

0

7

Locked

40.3

5

0

8

Locked

40.3

5

0

9

Locked

40.3

9

0

10

Locked

40.3

6

0

11

Locked

40.3

19

0

12

Locked

40.9

10

0

13

Locked

40.9

8

0

14

Locked

40.3

20

0

15

Locked

40.3

14

0

16

Locked

40.3

11

0

17

Locked

40.3

7

0

18

Locked

40.9

9

0

19

Locked

40.9

6

0

20

Locked

40.3

11

0

21

Locked

40.3

9

0

22

Locked

40.3

8

0

23

Locked

40.9

10

0

24

Locked

40.3

2

0

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legacy1
Alessandro Volta
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Message 3 of 9
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Re: Packet loss and latency spikes

Can't see your BQM yet can you post the live link.

Do you get any t# timeouts in the logs?

If you can copy the MAC of your router (TP Link Archer C7 ) to your PC/laptop NIC you can test with that to the modem mode port for a bit or go with another WAN IP by powering off the hub for 2mins.

You can run CMD with
ping -t 194.168.4.100
to see if packet loss matches up with your BQM.

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Theagg
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Message 4 of 9
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Re: Packet loss and latency spikes

https://www.thinkbroadband.com/broadband/monitoring/quality/share/fab05f14bd89c43654379ba3baae2c60b28eb50b
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Theagg
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Message 5 of 9
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Re: Packet loss and latency spikes

Every time i post the BQM links, I get error messages, can't seem to get the actual image to post...what exactly do I need to do to get that to appear, hmm, having tried numerous of the graph link options presented (Direct, small, large, BBCode)

No timeouts listed recently in the log and I will need a bit more explanation on exactly how and to where to copy the MAC address etc ! But I'm getting the feeling that the TP Link is not working well with the Hub 3., unless there are some specific settings on the Archer I have missed. Will do a BQM test tomorrow with the Hub 3 back in router mode to see if all those red spikes disappear.

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jbrennand
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Message 6 of 9
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Re: Packet loss and latency spikes

Do a screen grab around the BQM, save it and post it.


--------------------
Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.
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Theagg
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Message 7 of 9
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Re: Packet loss and latency spikes

ok, lets see if the image posts this time, this one is still on the TP Link up till 11am (wired to PC, Cat 6A) The image posted last night has finally appeared (see above). Will now switch Hub 3 back to router mode to test those packets..

graph 1.jpg

 

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tonycv51
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Message 8 of 9
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Re: Packet loss and latency spikes

Faulty equipment or line / noise problem looking at those lost packets.

As well as trying the hub in router mode suggest check coax into hub is properly tight and if still getting lost packets then call in a fault or wait for VM to reply on here. 

 

 

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Theagg
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Re: Packet loss and latency spikes

Well, I didn't get round to swapping the Hub back to router mode (gardening and stuff!) but interesting to note that even though nothing was changed or touched the packet loss abruptly disappeared at midday. See BQM image for today. That's with the TP Link still connected, the PC on all day (as yesterday), no cables touched, no reboots, nothing.

So, is that change indicative of some issues with Virgin that were resolved ? Some random 'noise' event that ran all yesterday and till midday today, then ended...About the only change that occurred is that around 11am, I turned the PC on for the day, it having been turned off at around 2.30 am on that graph...very odd

graph 2.jpggraph 2

 

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