[RT-AC68U] Flow Acceleration (FA) working on latest update (rev A2)

[EnfermeraSexy]

Hello! today i was learning everything about overclocking on latest firmwares and i saw something interesting. After testing that my router was stable with an overclock of 1400,800 i wanted to mod my CFE (v1.0.2.1). Then i saw that the last line was "ctf_fa_cap=1", so i decided to delete this line after changing some things i wanted. I was surprise because i saw that FA was enabled, and i read somewhere that it was only working on rev. B1.

After that i decided to make some test and see if that "enabled" was true, and surprise! Making speed test and downloading at full speed with torrents (400Mbps) CPU never goes up than 10%, but if i disable FA and has only CTF activated it reachs over 40-50% in both cores.

I can only get this working on latest Asus oficial firmware (3.0.0.4_384_20648, the only one i tried) and latest beta of Merlin (384.5_beta1). I couldn't make it work in Merlin's 384.4_2.
The sad news for me is that seems like if i enable vlans it gonna disable FA, and my internet provider need it to be activated (i tested this with a switch tagging ethernet port).

 

[asusn00b1777]

Hello! today i was learning everything about overclocking on latest firmwares and i saw something interesting. After testing that my router was stable with an overclock of 1400,800 i wanted to mod my CFE (v1.0.2.1). Then i saw that the last line was "ctf_fa_cap=1", so i decided to delete this line after changing some things i wanted. I was surprise because i saw that FA was enabled, and i read somewhere that it was only working on rev. B1.

After that i decided to make some test and see if that "enabled" was true, and surprise! Making speed test and downloading at full speed with torrents (400Mbps) CPU never goes up than 10%, but if i disable FA and has only CTF activated it reachs over 40-50% in both cores.

I can only get this working on latest Asus oficial firmware (3.0.0.4_384_20648, the only one i tried) and latest beta of Merlin (384.5_beta1). I couldn't make it work in Merlin's 384.4_2.
The sad news for me is that seems like if i enable vlans it gonna disable FA, and my internet provider need it to be activated (i tested this with a switch tagging ethernet port).

Can you please share your entire config with overclock settings. I will attempt to replicate.

 

[EnfermeraSexy]

Can you please share your entire config with overclock settings. I will attempt to replicate.

Sure, it's really simple. Just install the latest beta of Merlin or Asus, and with default options just make these two changes:
-Disable Spanning-Tree Protocol under switch settings
-Enable ctf_fa_cap in nvram

You have to delete the string ctf_fa_cap from CFE or delete it of nvram with the command "nvram unset ctf_fa_cap". After doing that ctf_fa_cap will appear with value 2 (ctf_fa_cap=2) and you will have it working, but i only tested it having Internet over DHCP without PPPoE or VLANs, i assume it should work with PPPoE enabled as just VLANs are the problem.


PD: The only changes i did in CFE is set "clkfreq=1400,800" (after testing it was stable in nvram), delete string ctf_fa_cap and change wifi settings to have all channels with max tx power. If you need anything else tell me, i can upload my backups, but i think is not necesary.

PD.2: You can set the following lanes in services-stop to make all my changes in nvram after reboting, it will disable Spanning-Tree Protocol too.

#!/bin/sh

#wifi settings
nvram unset territory_code
nvram set 0:regrev=0
nvram set 0:ccode=#a
nvram set 0:maxp2ga0=120
nvram set 0:maxp2ga1=120
nvram set 0:maxp2ga2=120
nvram set 1:ccode=#a
nvram set 1:regrev=0
nvram set 1:maxp5ga0=120,120,120,120
nvram set 1:maxp5ga1=120,120,120,120
nvram set 1:maxp5ga2=120,120,120,120

#stp and ctf
nvram unset ctf_fa_cap
nvram set lan_stp=0
nvram set lan0_stp=0
#oc
nvram set clkfreq=1400,800

nvram commit

 

[doczenith1]

It is interesting that you are able to get FA working on the 384 branch firmware. I had a 68U B1 and after updating to the 384 branch I could only get CTF, even after a reset and very minimal setup. That said, my 68U at 1000 MHz could do 940 Mbps WAN<>LAN albeit at 100% cpu usage on core 1. With FA enabled on the older firmware the cpu usage would be down around 10%.

 

[EnfermeraSexy]

It is interesting that you are able to get FA working on the 384 branch firmware. I had a 68U B1 and after updating to the 384 branch I could only get CTF, even after a reset and very minimal setup. That said, my 68U at 1000 MHz could do 940 Mbps WAN<>LAN albeit at 100% cpu usage on core 1. With FA enabled on the older firmware the cpu usage would be down around 10%.

I could in Asus firmware, just use this commands through SSH:

nvram set lan_stp=0
nvram set lan0_stp=0
nvram unset ctf_fa_cap
nvram commit

Just be sure you have latest merlin beta or asus firmware, and you don't have set any vlan