SOLVED: very asymmetric UL/DL speed on 2.5G line

[glens]

If multiple interconnects exhibit the behavior, take a look at the whiskers in the port. One or more bent out of proper orientation?

 

[Mikii]

But is it over 100M upload at least?

If I connect to a 1gigabit port /or to a 1 gigabit device, I get up to 1 gigabit in upload; the 100 mega bug only appears if I test a 2,5 gigabit connection either from the router or from a 2.5 line with a 2.5 device.
So, Yes, if HW acceleration gets disabled I get better upload speed, just like when I connect to a 1 gigabit machine, but I get downolad below 1 gigabit.

What did you test to, a 1G device? And you got a full 1G in both directions with mac connected to 2.5 and other device connected to 1G? Ideally would be good to test the full 2.5G ability of the port, if you have another 2.5G wired device you could connect it to the WAN port and do an iperf test between the two (obviously your internet would be down during that time and you'd have to set a static IP). Or if that router has a way to set both 2.5G ports as LAN (I don't believe so) that would be easier.

The iperf test was done between the 2.5 gigabit router LAN port and the 2.5 gigigabit doogle port on my computer. Speed was 2.2 gigabit.

Packet loss test is a definite next step, also did you check your MTU settings on PPPoE? Test your MTU with ping to find what it is and then set it in the router to avoid fragmentation issues. The symptoms don't point to it being a major fragmentation related issue but still good to rule it out.

It is really just starting to sound like their connection can't handle over a certain amount and it just starts experiencing severe drops.

Heres the packet loss:

mic@Mac-mini-di-Michele-2020 ~ % sudo mtr 1.1.1.1 -r


Password:


Start: 2023-10-11T07:24:18+0200


HOST: Mac-mini-di-Michele-2020.lo Loss%   Snt   Last   Avg  Best  Wrst StDev


  1.|-- rt-ax88u_pro-d228          0.0%    10    0.8   1.3   0.6   5.3   1.4

  2.|-- 100.99.0.119               0.0%    10   30.7  31.4  30.7  32.0   0.4

  3.|-- host226-38-61-217.static.  0.0%    10   32.9  32.4  31.9  33.7   0.5

  4.|-- crb-hu0-0-0-5.it3.aruba.i  0.0%    10   32.7  33.8  32.7  35.3   0.8

  5.|-- br1-hu0-0-0-21-703.it101.  0.0%    10   33.4  33.2  32.7  33.9   0.4

  6.|-- cloudflare.mix-it.net      0.0%    10   33.3  34.1  32.4  42.6   3.1

  7.|-- 172.71.112.4               0.0%    10   41.0  33.9  32.5  41.0   2.6

  8.|-- one.one.one.one            0.0%    10   32.7  32.8  32.0  33.4   0.4

mic@Mac-mini-di-Michele-2020 ~ % sudo mtr 8.8.8.8 -r

Start: 2023-10-11T07:24:49+0200

HOST: Mac-mini-di-Michele-2020.lo Loss%   Snt   Last   Avg  Best  Wrst StDev

  1.|-- rt-ax88u_pro-d228          0.0%    10    0.7 952.8   0.4 4483. 1640.2

  2.|-- 100.99.0.119               0.0%    10   31.5 951.2  30.4 4394. 1593.3

  3.|-- host226-38-61-217.static.  0.0%    10   32.0 926.7  31.5 4291. 1552.3

  4.|-- cra-hu0-0-0-5.it3.aruba.i  0.0%    10   33.6 902.8  32.5 4187. 1511.1

  5.|-- br1-hu0-0-0-21-704.it101.  0.0%    10   33.2 876.4  32.6 4082. 1470.3

  6.|-- 72.14.220.98               0.0%    10   32.1 692.8  32.0 3981. 1423.8

  7.|-- 74.125.245.241             0.0%    10   33.8 675.7  33.0 3882. 1386.5

  8.|-- 108.170.232.181            0.0%    10   33.3 657.7  33.1 3780. 1348.7

  9.|-- dns.google                 0.0%    10   33.1 639.0  32.2 3678. 1310.6

I am starting to think this is an asus bug or something. There are people here who had a similar problem with their gt-axe16000 and solved it using a 10gigabit port.

https://www.snbforums.com/threads/gt-axe16000-owners-thread.79334/page-7

MIC

 

[drinkingbird]

If I connect to a 1gigabit port /or to a 1 gigabit device, I get up to 1 gigabit in upload; the 100 mega bug only appears if I test a 2,5 gigabit connection either from the router or from a 2.5 line with a 2.5 device.
So, Yes, if HW acceleration gets disabled I get better upload speed, just like when I connect to a 1 gigabit machine, but I get downolad below 1 gigabit.



The iperf test was done between the 2.5 gigabit router LAN port and the 2.5 gigigabit doogle port on my computer. Speed was 2.2 gigabit.

Yeah the 2.5 gig connection from your computer to the router is one part of the equation, what were you testing to is my question? Ideally test with a 2.5G device on both 2.5G ports just to rule out the router completely.

Regardless, if applying a QOS limiter when testing to your ISP gives you better results (even if it restricts your download, it shows you can upload much faster), there is some issue with the ISP where they can't actually handle what you're trying to throw at them. Their 1G upload limiter is not functioning correctly would be my guess. Trying to get them to fix that may be like banging your head against a wall. If they only have equipment that can test up to 1G, my guess is their >1G service is very new and they have not worked out the kinks. You will probably just have to live with using 1G WAN port for now and possibly downgrading your speed with them until they can get it fixed (or have them reduce the cost of your service).

Unfortunately with PPPoE and them not being able to test over 1G, there is little you can do to prove anything. I'd still check and tweak your PPPoE MTU but it sounds like your ISP is just offering something they can't actually handle.

 

[Mikii]

Yeah the 2.5 gig connection from your computer to the router is one part of the equation, what were you testing to is my question? Ideally test with a 2.5G device on both 2.5G ports just to rule out the router completely.

Regardless, if applying a QOS limiter when testing to your ISP gives you better results (even if it restricts your download, it shows you can upload much faster), there is some issue with the ISP where they can't actually handle what you're trying to throw at them. Their 1G upload limiter is not functioning correctly would be my guess. Trying to get them to fix that may be like banging your head against a wall. If they only have equipment that can test up to 1G, my guess is their >1G service is very new and they have not worked out the kinks. You will probably just have to live with using 1G WAN port for now and possibly downgrading your speed with them until they can get it fixed (or have them reduce the cost of your service).

Unfortunately with PPPoE and them not being able to test over 1G, there is little you can do to prove anything. I'd still check and tweak your PPPoE MTU but it sounds like your ISP is just offering something they can't actually handle.

I agree that I have to live with this for now.... What I can do is find another 2.5gbps connection form some friend with a different ISP, bring my router over there, and test it on another line....

 

[LookedPath]

These are known issues with certain combinations of ONT and Router. On a very famous italian forum there are a huge amount of discussions about this, the N20 firmware on the f6005 usually fixes the issues for most routers but there are some that are still affected.
As you said the current theory is that the router is not honoring flow control requests being sent by the ONT and so the upload gets capped. If I remember correctly there was an issue with some Asus routers and after a while they fixed it with a software update.

 

[Mikii]

Well.. after wasting hours with phone calls to my ISP and doing all kind of tests, I finally fixed this!

At least in my case:

It was not the router....
It was not the ONT...

It was the ISP! Today I changed my internet company and opened a new line with another established ISP. Now I have 2.2 gigabit in download, 1.1 gigabit in upload (the line is 2.5/1 giga).
My big thanks go to all those who tried to give me tips to solve the problem.