High Latency & Lag Overtime

Discussion in 'Cisco/Linksys Wireless Routers' started by lsysguy, Apr 16, 2007.

  1. lsysguy

    lsysguy LI Guru Member

    Sometimes when I download near my ADSL connection's full speed the connection becomes more and more lagged even though the download speed is constant.

    Eg. a ping to a close server might be 60-120 m/s when downloading at full speed but overtime the ping will rise to 600 m/s making my VOIP unusable. I know there is QOS but that doesn't seem to help and my issue seems to be with the Linksys itself being overloaded.

    I've seen this behaviour with two different WRT54G models with the Linksys factory firmware.

    Especially with torrenting I find these routers can't handle the traffic without getting extremely lagged.

    Does anyone know what the problem is and how to fix it?
  2. ifican

    ifican Network Guru Member

    You nailed it in the first line of your description. When you connection is near or at 100% utilization you see increased latency which you should expect. Your incomming pipe only has so much space, if all of that space is being utilizied there is no extra room for voip or other traffic outside of the current data flow. Buffers are only so big, so they buffer traffic and if the traffic cannot be sent in time it is dropped. QoS as you have mentioned can be used on your internal traffic but has no bearing on external (inbound to you from your isp) traffic. In this instance it is probably not your router, just the over utilization of your incoming bandwidth. Though without knowing what your bandwidth is one cant say for sure.
  3. lsysguy

    lsysguy LI Guru Member

    Hi ifican

    I don't think that's the answer because it only happens when downloading from certain sites. I may max out my download speed but the latency doesn't get the high immediately it also gets higher over time even though the download speed remains constant.

    eg. I download at the max speed for 5 minutes straight latency is maybe 150ms but hours later it will be 600 ms

    There is definitely something wrong here
  4. lsysguy

    lsysguy LI Guru Member

    Actually even without reaching my maximum it still does it when doing downloads from some locations

    There is definitely something wrong
  5. ifican

    ifican Network Guru Member

    If you dont think its a bandwidth issue then I dont know. The only way to tell if its the router is to get another device and see if you still have that issue. I dont remember the exact number but i seem to recall somewhere around 12-15Mbps seems to push the wrt router to its limit. I am sure someone will correct me if i am wrong.
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