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Old 12-09-2011, 13:10   #1
Welshchris
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High Latency since the 8th
On the night of the 7th rolling over until the 8th my modem went offline and i didnt think much about it i thought Virgin were doing some work, since its back on i have a majorly increased latency compared to what has been shown before on Thinkbroadband Quality Monitor.

Its affecting things such as Video Buffering a lot

Here is the Event Viewer..

Wed Sep 7 23:49:04 2011 Wed Sep 7 23:49:04 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:49:26 2011 Wed Sep 7 23:49:26 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:49:27 2011 Wed Sep 7 23:49:27 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:49:49 2011 Wed Sep 7 23:49:49 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:49:49 2011 Wed Sep 7 23:49:49 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:11 2011 Wed Sep 7 23:50:11 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:12 2011 Wed Sep 7 23:50:12 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:34 2011 Wed Sep 7 23:50:34 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:34 2011 Wed Sep 7 23:50:34 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:37 2011 Wed Sep 7 23:50:37 2011 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:57 2011 Wed Sep 7 23:50:57 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:50:58 2011 Wed Sep 7 23:50:58 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:53:19 2011 Wed Sep 7 23:53:19 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=00:0f:35:bc:14:01;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:53:33 2011 Wed Sep 7 23:53:33 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:53:33 2011 Wed Sep 7 23:53:33 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:55:54 2011 Wed Sep 7 23:55:54 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=00:0f:35:bc:14:01;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:56:07 2011 Wed Sep 7 23:56:07 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:56:07 2011 Wed Sep 7 23:56:07 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:58:27 2011 Wed Sep 7 23:58:27 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=00:0f:35:bc:14:01;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:58:41 2011 Wed Sep 7 23:58:41 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Wed Sep 7 23:58:41 2011 Wed Sep 7 23:58:41 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:01:00 2011 Thu Sep 8 00:01:00 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=00:0f:35:bc:14:01;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:01:14 2011 Thu Sep 8 00:01:14 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:01:14 2011 Thu Sep 8 00:01:14 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:03:35 2011 Thu Sep 8 00:03:35 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=:14:01;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:03:48 2011 Thu Sep 8 00:03:48 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:03:49 2011 Thu Sep 8 00:03:49 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:06:03 2011 Thu Sep 8 00:06:03 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=00:0f:35:bc:14:01;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:06:16 2011 Thu Sep 8 00:06:16 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:06:17 2011 Thu Sep 8 00:06:17 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:08:37 2011 Thu Sep 8 00:08:37 2011 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=;CMTS-MAC=:14:01;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:08:51 2011 Thu Sep 8 00:08:51 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:08:51 2011 Thu Sep 8 00:08:51 2011 Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:09:09 2011 Time Not Established Warning (5) ToD request sent - No Response received;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Time Not Established Critical (3) TFTP failed - Request sent - No Response;CM-MAC=;CMTS-MAC=:14:01;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Time Not Established Warning (5) ToD request sent - No Response received;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Time Not Established Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Time Not Established Warning (5) MDD message timeout;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Thu Sep 8 00:09:49 2011 Thu Sep 8 00:10:09 2011 Warning (5) MIMO Event MIMO: Stored MIMO=0 post cfg file MIMO=-1;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Sat Sep 10 12:10:15 2011 Sat Sep 10 15:27:00 2011 Warning (5) Lost MDD Timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;


Here are errors shown on modem..

US-1 US-2 US-3 US-4
Channel Type 2.0 N/A N/A N/A
Channel ID 1 N/A N/A N/A
Frequency
(Hz) 45800000 N/A N/A N/A
Ranging Status Success N/A N/A N/A
Modulation 16QAM N/A N/A N/A
Symbol Rate
(KSym/sec) 5120 N/A N/A N/A
Mini-Slot Size 4 N/A N/A N/A
Power Level
(dBmV) 50.25 N/A N/A N/A
T1 Timeouts 13 13 13 13
T2 Timeouts 0 0 0 0
T3 Timeouts 1 0 0 0
T4 Timeouts 1 0 0 0

Here is now what TBB Quality Monitor looks like



Anyone know what the cause maybe suddenly?
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Old 12-09-2011, 13:24   #2
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Re: High Latency since the 8th
If you know your before/after VM Host Name, you could tell if you've been shifted to a different CMTS or line card.
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Old 12-09-2011, 13:41   #3
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Re: High Latency since the 8th
same line card thats first thing i checked. Last time i was moved to a different line card was back in May.
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Old 12-09-2011, 13:56   #4
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Re: High Latency since the 8th
Your area was extremely lightly utilised previously, VM may have moved some modems onto the same upstream.

I say may as the pattern there doesn't match what would be expected from congestion, extremely unusual for utilisation to be higher overnight than during the peak evening periods.

Odd to see streaming getting disturbed at those load levels, I can stream reasonably despite the below:

[img]Download Failed (1)[/img]

Worth asking the community team about.
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Old 16-09-2011, 07:14   #5
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Re: High Latency since the 8th
well it seems to have corrected itself, Someone from Virgin contacted me yesterday saying that it was caused by my modem creating a high ammount of timeouts but im sure thats when the modem was offline due to network work being undertaken.

anyway my graph now looks like this once again...
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