CODA-4582 - Open Issues for Investigation

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I'm a Reliable Contributor
Posts: 579

Re: CODA-4582 - Open Issues for Investigation

@gp-se Hm... But shouldn't the upload graph of the CODA-4582 look nearly identical to the CGNM-3552? This tells me something is wrong on the upstream side. You can see that the upload speed is dipping on the CODA-4582 graph, but why?

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Re: CODA-4582 - Open Issues for Investigation

@RyzenFX  Assuming all other things are equal (which is probably a bad assumption), the 3552 upload graph *appears* to indicate some sort of traffic shaping - hence the smoother graph at lower speed.  It appears the outbound wan queue on the 3552 may be buffering your outbound traffic.

Testing on DSLReports speed test would show you bufferbloat on the upload, which would help with this theory.

 

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Re: CODA-4582 - Open Issues for Investigation

A few people also tested the 3552 for gaming vs the CODA and it's a lot better on the 3552, all theory points in the direction that the 3552 is handling better so far, CODA is still on beta and it should out perform the 3552 easily, however we might not see that until a few firmwares fix. but once that's done we should finally see what the CODA is capable of.

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Re: CODA-4582 - Open Issues for Investigation

@Double_K I ran a speedtest on DSL Reports, here is my result:

 

 

This makes  sense, the bufferbloat that is affecting the CODA-4582 is not cosmetic at all (it was previously called cosmetic), but it is an actual problem. This bufferbloat problem is affecting the modem on the downstream and could possibly be at the source for the packet loss I'm seeing in League of Legends and random ping increases in other games as well. I've read that Bufferbloat causess packet delay variation, which causes the packet loss I'm seeing in league of legends. This bufferbloat problem is only attributable to the downstream. Multiple users have already complained of this problem earlier.

 

This bufferbloat can be attributable to the speedboost feature on all the Ignite plans EXCEPT for Ignite Gigabit. It makes a lot of sense. For instance, @4kgigabitguy is on the Ignite Gigabit where  speedboost is not enabled and gets 0.9 packets lost/minute in League of Legends. In my case, I'm receiving 6.7 packets lost/min on the 100u plan. If you read here, the Casa Systems CMTS could also be at the source of the problem. In Comcast D3.1 land, they aren't experiencing any bufferbloat issues which makes sense, because they're on a Cisco CMTS (or because they don't have a speedboost feature). So the problem has to be attributable to the speedboost feature + the CMTS.

 

@RogersDave @Datalink What do you think of this? I think it makes sense, bufferbloat can be due to the speedboost feature and CMTS, but I'm really curious what both of your opinions are.

 

Rogers Employee 4kgigabitguy
Rogers Employee
Posts: 45

Re: CODA-4582 - Open Issues for Investigation

@RyzenFX

 

Here are my upstream levels(my levels tend to flucate but I haven't noticed degraded performance that would point to signal issues)... Previously I was using the CGN3ACSMR & captured some logs & tests prior to my switch..Will share later today

Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 43.500 4 6400000
2 38595609 ATDMA - 64QAM 46.500 6 3200000
3 23700000 ATDMA - 64QAM 43.250 5 6400000

 

I am going to play another match of LoL today & will provide results again. I also plan to test out CSGO today, I am welsome to any suggestions on the best way to capture logs/performance for CSGO.

 

Upgrading from regular ps4 to ps4 pro today so looking forwarding to playing some games online as well!!

 

4kgigabitbuy

 

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Re: CODA-4582 - Open Issues for Investigation

@RyzenFX I was actually referring to "bufferbloat" on your upload - which would be your modem/gateway.  Assuming that result is on the CODA-4582, your results show an upload bufferbloat of 95ms average, with a 555ms sample.  Did you run a similar test on the 3552?  If so, what did it show for upload?

 

For the download, Dave has previously indicated that the bufferbloat for download is related to the SpeedBoost for non-Gigabit customers.  To prove this, go to the DSLReports Speedtest preferences, and in the Advanced Settings, set your down speed to the advertised speed (ie. 100) of your connection.  You'll notice your download bufferbloat get alot better, but your download speed will be limited to 100Mbps for the entire test.

Rogers Employee 4kgigabitguy
Rogers Employee
Posts: 45

Re: CODA-4582 - Open Issues for Investigation

@RyzenFX

 

If you just got the CODA, did you check what firmware it came with? I am running the trial version. Have you put in a request to get the beta yet? I would try testing with that one as I didn't have the best performance with .24

 

Will do a deeper review on your posts as possibly there is another factor that is causing you to not get the same results as myself.

 

 

 

 

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I'm a Reliable Contributor
Posts: 579

Re: CODA-4582 - Open Issues for Investigation

@4kgigabitguy Thanks for replying. Your upstream signal strength is much stronger than mine, and when looking back at your speedtests (specifically the 2015 macbook air) on the Rogers speedtest site, your upload graph looks really similar to my upload graph on the CGNM-3552. Also, your bufferbloat looks good on the upload and download, and ideally that is what I should be getting. I'm on .24, but hopefully I'll get upgraded to .26 tomorrow (sent a PM to Dave requesting upgrade). I'll let you know how things go.

 

Image removed due to privacy reasons - RogersMoin

 

@Double_K There could be bufferbloat on the upstream aswell, I don't want to keep that out of the problem.  Unfortunately, I was not able to run a similar test on the 3552 prior to switching, but I'd imagine that the bufferbloat for both upstream and downstream would be a lot lower. If you can look at the upload graph above, that is what I SHOULD be seeing on my CODA-4582.

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Posts: 154

Re: CODA-4582 - Open Issues for Investigation


@RyzenFX wrote:

@4kgigabitguy @RogersDave @Datalink I just switched my CGNM-3552 back to the CODA-4582. I ran some test games of LoL, however it's packet loss is nowhere near the packet loss I averaged with the 3552; it's worse. I averaged  6.7 packets lost/min. However, I do have a suspicion that the CMTS is not communicating with the modem properly (i.e CMTS is not giving the modem enough upstream signal strength, which needs to be adjusted). 

 

Despite both modems being on DOCSIS 3.0 upstream, the upload graph varies for both modems. Why does it show a constant upload speed graph for the 3552 than on the 4582? There's definitley something wrong here with the CODA-4582, or CMTS. 

 

@4kgigabitguy What are your upstream signal strengths? I would like to compare yours to mine. 

 


FWIW, I have 34.5, 35.5 an 38.5 for upload on D3.1 and get pretty much full 50mbit upload. However has been pointed out, these have no meaning from the client side. I could be at 25 or 40.

 

We already know that the CODA modem has a lot of problems -- I think it's safe to assume that the problem lies on the modem side.

I Plan to Stick Around
Posts: 154

Re: CODA-4582 - Open Issues for Investigation


@JohnBeaudin wrote:

A few people also tested the 3552 for gaming vs the CODA and it's a lot better on the 3552, all theory points in the direction that the 3552 is handling better so far, CODA is still on beta and it should out perform the 3552 easily, however we might not see that until a few firmwares fix. but once that's done we should finally see what the CODA is capable of.


This is working on the assumption that the hardware is fit. We know that the chipset has major issues. We know that the hardware design itself has issues (hence the need for extra shielding, and known problems with WiFi interference).  I don't think that it's safe to assume that this modem will ever be better, and FirmWare fixes will likely only be to work around hardware limitations.