Asus RT-AC85P performance in comparison to my ISP router/modem

Hello Community :slight_smile:

I want you to ask for advices about my results under OpenWRT (23.05) on Asus RT-AC85P in comparison to my Technicolor CGA2121 (from my ISP provider).

My setups is:

  • 600/60 declared speeds (easily reachable via ethernet)
  • Technicolor as a modem, set in bridge configuration,
  • Asus as a router.

WiFi configuration:

  • 2,4 GHz, CH1, 40 MHz,
  • 5 GHz, CH36, 80 MHz.

And there are the speed results (checked on Moto Edge 40, speedtest.net app, 3 tests after each other, phone is placed ~1 m from the devices; devices are placed next to each other):

TECHNICOLOR
2,4
123 / 62,3
196 / 61,7
196 / 62,6
5
601 / 62,7
76 / 61,1
564 / 61,9

TECHNICOLOR (ASUS RADIOS DISABLED)
2,4
163 / 24,7
193 / 50,9
202 / 63,41
5
587 / 62,5
75,2 / 63
575 / 62,5

ASUS
2,4
111 / 59
135 / 61,2
141 / 60,8
5
414 / 48,2
419 / 46,4
427 / 36,4

ASUS (TECHNICOLOR RADIOS DISABLED)
2,4
144 / 54,6
144 / 60,8
141 / 61,38
5
390 / 60,1
386 / 63
377 / 63,2

Unfortunately I doesn't have any results from the stock ASUS firmware so I am not sure these discrepancies are hardware connected or just configuration in the OpenWRT.

What I have done already:

  • WWM mode checked by default for both radios,
  • radio power set to 13 dBm (19 mW) for 2.4 and 20 dBm (100 mW) for 5,
  • Coverage cell density for both radios to Very High,
  • Country code set to PL,
  • Force 40MHz mode for 2.4 marked.

What do you think about it?

In my opinion, these wi-fi speeds are close to the maximum for Asus with openwrt. Asus RT-AC85P - MT7621AT
try to test Asus in dumb AP mode.
Asus - try to enable Software flow offloading and Hardware flow offloading

With the Software and Hardware options enabled results are:

TECHNICOLOR
2,4
199 / 62,4
189 / 59,4
196 / 22,6
5
549 / 51,16
586 / 30,9
570 / 26,2
ASUS
2,4
174 / 49,4
172 / 21,9
175 / 52,4
5
439 / 31,9
443 / 30,6
438 / 56,4
437 / 29,9
ASUS (TECHNICOLOR RADIOS DISABLED)
2,4
181 / 62,8
181 / 58,5
135 / 24,9
184 / 45,3
5
415 / 47,8
440 / 27,3
439 / 32,8
452 / 56,1
457 / 62,5
451 / 19,6

So there is a little performance boost on the 2.4 GHz network, but 5 GHz looks the same. Upload today looks more busy in comparison to last measurements.

About the dumb AP mode - in my home network all my connected devices are configured with static IPs and it is configured in Asus. The Technicolor has option for advanced configuration too but I prefer to have this configured on my side, not the ISP provider device.

I have not tested the latest OpenWRT release on our ASUS RT-AC85P in terms of WiFi speed, but the last version I used for that (21.02 I think) was very variable, my own HP laptop was mostly fine but my friend's Asus laptop (somewhat ironically) was showing really slow speeds. We didn't have that problem with a Linksys WRT3200 before.

We decided to put in a few Netgear access points instead. We still use OpenWRT as our router though, just not the built-in WiFi of the RT-AC85P

So not an answer, but a warning that WiFi performance is not always great due to the lack of open source drivers, and if speed really matters use a wired connection!

1 Like

So the expected performance is present.

Using ethernet I am on 100%+ performance on the stock and OpenWRT.

I will provide results from the stock Asus firmware till the end of this week.

I made some additional testing and when both radios running the same SSID & when 2.4 is turned off performance matches above results.

Edit:
Not sure why bill removed his comment but according to him on the stock Asus firmware he was getting more d/u than me.
I will check it as soon as possible and get back to you with the results.

I found additional problem with my 5GHz network. When I choose channel greater than 64 (for example 100) the WiFi is not waking up:

About 30 minutes are passed and the WiFi is still not available. Why? Region is set to PL (I am in Poland).

Set the region to Panama

https://www.wiisfi.com/

How do you know that Panama will work for the 100 Channel? I have been looking for these information (about channels in regions, countries, etc.) for several days and cannot find a reliable source.

What section of the mentioned website I need to read in this subject?

The topic of wifi is huge, how do we know what the conditions are at your place? How many wifi networks do you have nearby? The best way is to read everything from the link I sent, there is a table of contents.

install htop "process viewer" and see the CPU utilization during the wifi speed test

1 Like

Hello,

Finally I made a bunch of results on the stock Asus firmware. Unfortunately I lost my backup from this firmware so settings are completly stock except for the settings I have set for a given network band. And the results looks... quite impressive.

ASUS (with TECHINCOLOR radios ON with the same settings)
2.4 (CH1, 40 MHz, default settings)
182 / 43,8
253 / 24,2
281 / 62,3

5 (CH36, 80 MHz, default settings)
472 / 43,5
533 / 47,5
538 / 27,0
488 / 25,6
538 / 51,5

2.4 (CH1, 40 MHz, N only mode)
232 / 62,6
268 / 64,4
269 / 62,0

5 (CH36, 80 MHz, N/AC mixed mode, automatic select available DFS channels)
548 / 61,5
544 / 57,7
496 / 51,6
538 / 62,8
412 / 63,8

ASUS (with TECHNICOLOR radios OFF)
2.4 (CH1, 40 MHz, N only mode)
92,1 / 58,3
226 / 54,0
201 / 63,3
257 / 60,4

5 (CH36, 80 MHz, N/AC mixed mode, automatic select available DFS channels)
566 / 54,2
567 / 46,1
575 / 48,4
560 / 57,8
576 / 61,3

2.4 (CH11, 40 MHz, N only mode)
221 / 62,5
218 / 57,4
212 / 61,8
227 / 61,9

5 (CH100 (112 is max), 80 MHz, N/AC mixed mode, automatic select available DFS channels)
627 / 63,5
623 / 62,7
618 / 58,9
625 / 56,5
626 / 56,6

It clearly shows that OpenWRT significant limitating my hardware, but why?