My wireless connection crawls for 20sec every 2min. NetworkManager was scanning my wireless network every 2min (iwevent says so). The problem is that the scan lasts 20sec, and during that 20sec, I get the following dmesg messages: ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 failed to flush and my connection crawls. The card is Linksys WMP600N (rt2800pci). I tried different kernels, different driver settings, different NetworkManager configurations, etc. Since it's the only wireless card I have, I couldn't try different card and didn't feel like buying another. Finally, an accidental click led me to a solution: To prevent NetworkManager from scanning, set BSSID to the MAC address of access point. -- William