Asus RT-N66U and QOS

jrwagh333 · 8 Dec 2014 at 11:09

I have Virgin with 152Mb, sometimes going up to 160Mb.

I want to enable QoS on my router. When I had 120Mb, it worked flawlessly. I have since adjusted the QoS rules to allow up to 160Mb but it will still throttle me to 120Mb. If I completely disabled QoS then I can get the full 160Mb, but even if I turn QoS on and have no rules set at all, it will still cap to 120Mb.

Any ideas?

Steveocee · 8 Dec 2014 at 11:53

Have you tried removing QOS, rebooting router, adding "new" QOS, rebooting router?

Sometimes they have problems with "remembering" certain values.

lamboman · 8 Dec 2014 at 13:25

I'm fairly sure that the N66U will not be able to handle QoS at those kinds of speeds, but I could be wrong.

What Steveocee said may be true, however why do you need QoS on a 160Mbps connection?

jrwagh333 · 9 Dec 2014 at 10:26

Steveocee said:
Have you tried removing QOS, rebooting router, adding "new" QOS, rebooting router?

Sometimes they have problems with "remembering" certain values.

Yes, I did give that a go but it didn't really seem to help in any way, unfortunately

lamboman said:
I'm fairly sure that the N66U will not be able to handle QoS at those kinds of speeds, but I could be wrong.

What Steveocee said may be true, however why do you need QoS on a 160Mbps connection?

Sometimes when people in my house are uploading, it obviously slows down webpage loading and other things. So all I really wanted to do was limit their upload speed to about half.

Steveocee · 9 Dec 2014 at 12:15

Odd one to try but try setting your bandwidth amount higher than what it actually is. Asus used to suggest that themselves.

If you're on latest firmware (are you? if not upgrade) what is the CPU usage like when QOS is on and running? Check to make sure it isn't maxxing out.

Andy_82 · 10 Dec 2014 at 16:53

You're probably maxed out the cpu usage, i'm using the same router with tomato firmware and the qos is pretty much limited to 60 Megabits per second. Removing and disabling some rules should improve the throughput a little but the cpu isn't powerful enough to do qos at much more than this.

The reason is mainly because when qos is enabled it automatically disables CTF (cut through forwarding).

This is with tomato firmware obviously, but asus's default firmware and thus merlin's build are based on tomato source code.

If you need qos you need a faster router, the rt-ac68u will be better, but i don't know how much better. the new rt-ac87u is supposed to be able to perform qos without having to automatically disable CTF so should be able to max your bandwidth although i'm not 100% sure if thats correct so i'd do some research before purchasing.