Does QOS work properly with 10mb 'net connection in DD-WRT?

Discussion in 'DD-WRT Firmware' started by -RT-, Jan 11, 2006.

  1. -RT-

    -RT- Network Guru Member

    I'm using a WRT54G v2.0, currently with sveasoft alchemy firmware.

    I've just had my internet service upgraded to 10mbit. I've been using Sveasoft Alchemy for a while now and at 4mbit the QOS worked fine, but with a 10mbit connection, no matter what I set the upload/download levels at, I can't get more than 6mb throughtput :( As soon as I turn off QOS, I get the full 10mb.

    I seem to recall reading somewhere that Alchemy's QOS can't cope with more than about a 6mb connection, but I can't find the original post.

    Is the 6mbit limit a hardware, or firmware issue?

    I've been contemplating trying DD-WRT for a while now and if it overcomes the QOS limit I've hit with alchemy, this could be just the nudge I need to switch :)

    Thanks in advance.

  2. matthiaz

    matthiaz Network Guru Member

    I don't know. Try it! :eek:
  3. -RT-

    -RT- Network Guru Member

    I intended to try it, but was foiled by my router deciding to curl up its toes when I rest it, in preparation for the firmware upgrade :eek:

    Last time I upgraded the firmware, I just did a factory reset and upgraded the firmware via the HTML interface. This time I thought I'd be a little more cautious and after doing the factory reset, held the reset button in on the back of the router for 30 seconds - Just to be sure.

    At this point the power LED started flashing and the router seems to have bricked itself before I even got near it with a firmware update :p

    Opened it up, tried the pin 15 & 16 short, with no success. Got a ping response using the pin 16 to earth technique and it even allowed me to upload new firmware via TFTP, but despite the power LED stopping flashing the router became effectively dead to all outside communication as soon as the flash completed.

    Don't recall ever seeing any posts about a router bricking itself on a reset, but holding in the reset button for 30 seconds seems to have been the catalyst for it's demise.

    Will keep fiddling with it, but have ordered a new WRT54GS to replace it. Depending on how good/poor the linksys QOS, I may be back in a couple of days ;)
  4. -RT-

    -RT- Network Guru Member


    The good news: After trying several recommended unbricking firware version, I finally managed to unbrick the router by running the latest Linksys official firmware installer once I got a ping :D

    The bad news: With QOS set to off, I can max out my 10mbit connection with ease. With it on, I'm still only getting around 6-6.5 mbits max, with the downlink speed at any setting between 8000 - 9500 :(

    I only have 3 services set:

    SkypeToSkype = Express
    NNTP = Bulk
    FTP = Bulk

    As the router exhibits similar behaviour with both Alchemy and DD-WRT firmwares, is this a hardware limitation of the router itself? Is the GS likely to fare any better?

    Thanks in advance.
  5. lore

    lore Network Guru Member

    Let me know what you find out - I have a 12mbit/12mbit connection and would hate to have it throttled in such a way that the connection is only half of its effective rate.

  6. Eigleas

    Eigleas Guest

    I've been having the same problems with QOS enabled on my WRT54GS v1 and DD-WRT v23. I had noticed it with v22 when I actually tried to check my bandwith. I have a 15mb / 2mb connection and I've noticed a substantial decrease in speed when QOS is enabled, so right now I have it disabled. I had setup MAC priority for 2 VOIP lines. I hope a solution is found because other than that v23 is running great.
  7. Lazybones

    Lazybones Network Guru Member

    The CPU on the WRT is just not powerfull enough to do full QoS at those speeds.

    Ones you hit connections faster than 6/7 Mbit you should invest in a more expensive / more powerfull router OR build a Linux based router out of a PC.. There are MANY great free router projects. DD-WRT and the WRT just happen to be VERY compact and easy to use.
  8. lore

    lore Network Guru Member

    How does it intend to do QOS stuff over the LAN then? That's easily upwards of 70-80mbits!
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