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Enabling QoS lowers "quality" grade (but helps bufferbloat)

Discussion in 'ASUS N Routers & Adapters' started by jay-aitch, Jul 14, 2018.

  1. jay-aitch

    jay-aitch New Around Here

    Joined:
    Jan 14, 2018
    Messages:
    2
    Running an RT-N66U using the 374.43 forked firmware. When I run the speed test on dslreports, I get an A+ for Quality but an F for BufferBloat. Speeds for down/up are generally around 69/6.

    So I enable QoS with down/up of 63/5. Re-run speed test and my BufferBloat increases to a C, at least. But Quality goes from A+ to C. The speed test help suggests this is due to having to packet loss. Why would it decrease? How can I fix this?
     
  2. cybrnook

    cybrnook Senior Member

    Joined:
    Jan 8, 2014
    Messages:
    456
    QoS disables hardware (NAT, CTF) acceleration
     
  3. Sinner

    Sinner Senior Member

    Joined:
    Sep 30, 2017
    Messages:
    295
    Location:
    Canada
    I think that depends on router model.. on my ac3100 qos only disables FA but leaves ctf enabled
     
  4. FreshJR

    FreshJR Very Senior Member

    Joined:
    Oct 8, 2016
    Messages:
    927
    To expand.

    AdaptiveQOS leaves ctf enabled
    Traditional does not.

    @jay-aitch is using traditional.

    Could your router be too slow for the connector. You may be cpu limited.
     
  5. doczenith1

    doczenith1 Senior Member

    Joined:
    Sep 19, 2014
    Messages:
    444
    Location:
    MI
    Digging deep in the old memory banks here but I know my old N66U could do 125 Mbps on my comcast contention. I am fairly certain that CTF was enabled on my router. I don't remember if I ever tested it with NAT acceleration turned off.