WRT54GL, Teddy Bear R47: High WLAN ping under heavy traffic

Discussion in 'Tomato Firmware' started by Thrax, Jul 1, 2010.

  1. Thrax

    Thrax Networkin' Nut Member


    I have a WRT54GL running the Teddy Bear mod for Tomato (R47, kernel 2.6, MIPSR1), and I am experiencing very high wireless pings when the router is under heavy load. BitTorrent is the chief culprit, but long-term downloads do this as well.

    • My apartment is an even 72°F.
    • The router is in a well-ventilated location.
    • The router's xmit power is 42mW.
    • I only have four QoS rules; only one is IPP2P.
    • I'm running channel 2; the closest (weak) routers are on 1 and 4.
    • I don't own a microwave.
    • I have identical results on Broadcom, Atheros and Ralink chipsets.
    • Security is 63-character WPA2 AES.

    When left alone, the router pings approximately 1ms, but the pings under heavy traffic are as high as 400 or 500. You can imagine what this does to games and web browsing.

    I'll be more than happy to dump my router's configuration or try various settings. For the record, my personal OS is Windows 7 Professional X64, and my network card is a D-Link DWA-552 (Atheros AR5008).
  2. teetee1

    teetee1 Networkin' Nut Member

    It would certainly be helpful if you can provide the log (the ping record) and the network layout information. When you mentioned that you get 400-500 pings per sec. when router is under load, do you mean when the network i/o(countrack numbers) are high or the router's cpu load/uptime value is high?
  3. Davka

    Davka LI Guru Member

    Set transmit speed to constant value (ie. 24Mbps) and tell us if there is a difference.
  4. Thrax

    Thrax Networkin' Nut Member

    Nothing fancy. Cable modem connected via uplink port to the router, and two PCs connected wirelessly. No wired connections to be found.

    CPU load during these periods of high latency is around 0.22, and the conntrack reads from 800-1400.
  5. Thrax

    Thrax Networkin' Nut Member

    This stabilized the ping to <1ms for a short while, but it slowly rose and destabilized over the course of 10 minutes.
  6. Thrax

    Thrax Networkin' Nut Member

    Update: The CPU load is down to 0.01 over 15 minutes, and I'm still getting 14% packet loss and pings of 1-771ms, with an average of 90. BitTorrent is disabled for these stats.


    Another update. I reflashed the router with a thorough NVRAM reset and performed all my configuration steps one-by-one. I had a ping window open throughout the entire process of reconfiguring the device as it was before the flash.

    The moment I switched the wireless channel to anything other than 6, the ping went ballistic. If I set the channel back to 6, which is a channel occupied by two other routers, everything was fine.

  7. barakaspeed

    barakaspeed Network Guru Member

    I am having the same issue with the same ver of firmware. I have my xbox360 hooked up to a Linksys WRT54GL running in client wireless (I've tried WDS and wireless bridged modes as well) connecting to an Asus RT-N16. Both routers have the same ver of firmware for their respective processors. I've been racking my mind for 2 weeks with this where it pings fine under no load, but then after approx 10-15 min I start dropping online games. I monitor the ping between routers and see the drops start. I am tempted to try DDWRT latest to see if it's a firmware or hardware issue.
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