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Gig1 slow speed after upgrading

blastStu
Joining in

on ‎03-12-2021 15:48

Hi, I recently upgraded from M500 to Gig1 and the speeds are slower.

I have run a test using SamKnows realspeed so that I can test from the Virgin Media Hub 4.  I only ever get a maximum of 370Mbps.

vm_speed.PNG

 

I've tried rebooting etc etc.  I am using a Google Wifi Mesh which is connected via ethernet to the hub.  When I run a speed test directly from the Google Wifi node that is connected over ethernet I get a maximum of 370Mbps.

I've seen in other threads that a low number of downstream channels can be an issue, this is what I have:

 

Cable Modem StatusItem Status CommentsChannel Overview Downstream Upstream

Cable Modem Status
Online
DOCSIS 3.1
Primary downstream channel
Locked
SC-QAM
DOCSIS 3.0 channels
22
4
DOCSIS 3.1 channels
1
0

 

Any advice on what to do?  There's no response in the online chat, just waiting.

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6 REPLIES 6

blastStu
Joining in

on ‎03-12-2021 15:51

Also, here is the log:

 

Network Log

Time Priority Description

Thu 01/01/1970 00:01:223No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 04/08/2021 20:07:105MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 04/08/2021 20:07:373No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 04/08/2021 20:08:045MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 04/08/2021 20:08:295RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu 01/01/1970 00:01:313No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 01/12/2021 06:27:465MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed 01/12/2021 06:58:444DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 07:06:015MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:16:483SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:16:535Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:063No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:086CM-STATUS message sent. Event Type Code: 4; Chan ID: 19; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:093No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:093SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:135Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:143SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:18:256CM-STATUS message sent. Event Type Code: 4; Chan ID: 19; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 12:21:475MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu 01/01/1970 00:01:263No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 15:14:005MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu 01/01/1970 00:01:333No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 03/12/2021 15:23:075MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
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blastStu
Joining in
In response to blastStu

on ‎03-12-2021 16:10

I appear to have solved this problem.  I'm posting here incase anyone else finds it useful.

I think the downstream channels may have been the issue.

All I did was performed a factory reset in the admin interface of the hub.  Once it restarted I had decent speed to the hub:

 

vm_speed_2.PNG

And all 31 downstream channels:

Cable Modem StatusItem Status CommentsChannel Overview Downstream Upstream
Cable Modem Status
Online
DOCSIS 3.1
Primary downstream channel
Locked
SC-QAM
DOCSIS 3.0 channels
31
4
DOCSIS 3.1 channels
1
0
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mattdady
Joining in
In response to blastStu

on ‎03-12-2021 20:43

how is you speed to the computer as thats where my issue lies

 

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blastStu
Joining in
In response to mattdady

on ‎03-12-2021 21:15

I'm getting 890Mbps over the ethernet wire at the moment. Seems pretty good but I may try a few different cables to see if there's difference there...

Over WiFi that's a different matter, only getting 300 ish, but that's the WiFi...

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carl_pearce
Community elder
In response to blastStu

‎03-12-2021 21:44 - edited ‎03-12-2021 21:46

@blastStu wrote:

I'm getting 890Mbps over the ethernet wire at the moment. Seems pretty good but I may try a few different cables to see if there's difference there...

Over WiFi that's a different matter, only getting 300 ish, but that's the WiFi...

890Mbps is pretty good considering 1Gbps ethernet including overheads hits a limit of around 940Mbps.

Try a speed test on another device at the same time and you should see your full 1145Mbps across both devices.

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blastStu
Joining in
In response to carl_pearce

on ‎04-12-2021 07:46

To be honest, 890Mbps download is great. 

The thing that really bugs me is the upload speed. It maxes out at 50Mbps. I wish we could have better upload performance for multiple remote meetings, video chats, remote working, uploading etc etc.  I'd drop the spare 200 ish Mbps of download speed that is tricky to use and move it to the upload!

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