Did they not fix the latency issue on the hub 4?

[Cyirak]

I installed a Hub4 (was hoping for a hub5) yesterday and upgraded from 500 to gig1.

Speeds are fine  getting 945 down through ethernet and 45-52 up. however i noticed that the old latency spikes are back from when i originally signed up to virgin years ago. i belive it was an issue with the intel puma chip the behaviour looks exactly the same to me.

You can see exactly where i swapped the superhub at around 4 pm yesterday

anyone else experienced this? or could there be an issue on my connection causing this?

[Cyirak]

Cable Modem Status
Item	Status	Comments
Cable Modem Status	Online	DOCSIS 3.1
Primary downstream channel	Locked	SC-QAM
Channel Overview	Downstream	Upstream
DOCSIS 3.0 channels	31	4
DOCSIS 3.1 channels	1	0

3.0 Downstream channels

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
25	330750000	5.699997	38.983261	QAM256	25
6	178750000	6.400002	38.605377	QAM256	6
7	186750000	6.099998	38.605377	QAM256	7
8	194750000	5.900002	38.605377	QAM256	8
9	202750000	5.699997	38.605377	QAM256	9
10	210750000	5.400002	38.983261	QAM256	10
11	218750000	5.000000	38.605377	QAM256	11
12	226750000	4.500000	38.983261	QAM256	12
13	234750000	4.000000	38.605377	QAM256	13
14	242750000	3.599998	38.983261	QAM256	14
15	250750000	3.099998	38.605377	QAM256	15
16	258750000	3.900002	38.605377	QAM256	16
17	266750000	5.300003	38.983261	QAM256	17
18	274750000	6.000000	38.983261	QAM256	18
19	282750000	6.199997	38.983261	QAM256	19
20	290750000	6.400002	38.983261	QAM256	20
21	298750000	6.000000	38.983261	QAM256	21
22	306750000	5.500000	40.366287	QAM256	22
23	314750000	5.500000	38.983261	QAM256	23
24	322750000	5.599998	40.366287	QAM256	24
26	338750000	5.699997	40.366287	QAM256	26
27	346750000	5.900002	40.366287	QAM256	27
28	354750000	6.099998	40.366287	QAM256	28
29	362750000	6.199997	40.366287	QAM256	29
30	370750000	5.599998	40.366287	QAM256	30
31	378750000	4.800003	38.983261	QAM256	31
32	386750000	4.300003	38.983261	QAM256	32
33	394750000	3.900002	38.605377	QAM256	33
34	402750000	3.900002	38.983261	QAM256	34
35	410750000	4.000000	40.366287	QAM256	35
36	418750000	4.400002	38.983261	QAM256	36

[Cyirak]

3.0 Downstream channels

Channel	Lock Status	RxMER (dB)	Pre RS Errors	Post RS Errors
25	Locked	38.983261	0	0
6	Locked	38.605377	0	0
7	Locked	38.605377	0	0
8	Locked	38.605377	0	0
9	Locked	38.605377	0	0
10	Locked	38.983261	0	0
11	Locked	38.605377	0	0
12	Locked	38.983261	0	0
13	Locked	38.605377	0	0
14	Locked	38.983261	0	0
15	Locked	38.605377	0	0
16	Locked	38.605377	0	0
17	Locked	38.983261	0	0
18	Locked	38.983261	0	0
19	Locked	38.983261	0	0
20	Locked	38.983261	0	0
21	Locked	38.983261	0	0
22	Locked	40.366287	0	0
23	Locked	38.983261	0	0
24	Locked	40.366287	0	0
26	Locked	40.366287	0	0
27	Locked	40.366287	0	0
28	Locked	40.366287	0	0
29	Locked	40.366287	0	0
30	Locked	40.366287	0	0
31	Locked	38.983261	0	0
32	Locked	38.983261	0	0
33	Locked	38.605377	0	0
34	Locked	38.983261	0	0
35	Locked	40.366287	0	0
36	Locked	38.983261	0	0

3.1 Downstream channels

Channel	Channel Width (MHz)	FFT Type	Number of Active Subcarriers	Modulation (Active Profile)	First Active Subcarrier (Hz)
37	96	4K	1880	QAM4096	759

3.1 Downstream channels

Channel ID	Lock Status	RxMER Data (dB)	PLC Power (dBmV)	Correcteds (Active Profile)	Uncorrectables (Active Profile)
37	Locked	43	4.0	120153432	0

3.0 Upstream channels

Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
1	32600000	40.020599	5120 KSym/sec	16QAM	5
2	39400000	40.020599	5120 KSym/sec	16QAM	4
3	46200000	39.770599	5120 KSym/sec	32QAM	3
4	25800000	40.270599	5120 KSym/sec	16QAM	6

3.0 Upstream channels

Channel	Channel Type	T1 Timeouts	T2 Timeouts	T3 Timeouts	T4 Timeouts
1	US_TYPE_STDMA	0	0	2	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0

I noticed the upstream has gone to a lower modulation. this tends to happen from time to time but normally all channels are at 64QAM

[Adduxi]

---

@Cyirak wrote:

<snip>  

I noticed the upstream has gone to a lower modulation. this tends to happen from time to time but normally all channels are at 64QAM

---

You have diagnosed the issue yourself as above.  No much you can do except call it in, or wait here a day or two for a VM Mod to respond.

[Cyirak]

Yeah really disappointing. The Latency is horrible, I'll monitor for a few days and wait for a vm mod to respond.

Thanks for taking the time to respond.

[Cyirak]

So appears that there was a fault in my area that was resolved on Monday which was affecting the upload. However, my latency is still much worse and is terrible for gaming, wasn't brilliant before on the 500mb service compared to bt fftc or fttp but acceptable, its now dire.  all upstream channels are now at 64QAM and look to have been since the area issue was resolved.

HUB3 on 500mb day before I swapped over

On Gig1 with Hub 4

[Cyirak]

just noticed this, does this suggest there's a problem, the QAM on the downsteam has dropped to 2048 and there are a bucket load of correcteds.

[Cyirak]

Interestingly reboot of the SH4 (at about 8pm last night) which is in modem mode looks to resolved the issue. it was rebooted about 2 hours after i had swapped over so didn't really expect anything. 

[Adduxi]

---

@Cyirak wrote:

just noticed this, does this suggest there's a problem, the QAM on the downsteam has dropped to 2048 and there are a bucket load of correcteds.

---

The QAM as you point out should be 4096.  As for the PreRS correctable figures, that's okay.  It's the PostRS uncorrectable errors that cause issues 

[Cyirak]

Thanks, This seems to have stuck at 4096 since the reboot so fingers crossed its now sorted. i'm also getting the full 52mbps upload where as before i was hitting 40.

Thanks for your help and taking the time to respond.