Hello, I have an ath9k compatible wlan nic (TP-Link TL-WN851N v1, pci id: 168c:0023) and every 30 seconds all outgoing packets seem to be blocked/delayed for about 2 seconds (incoming traffic seems to be unaffected). There are no error messages logged by the kernel.
The network freezes are easily seen with ping (here with 0.1 seconds interval): > 64 bytes from 192.168.6.60: icmp_req=657 ttl=64 time=1.62 ms > 64 bytes from 192.168.6.60: icmp_req=658 ttl=64 time=1.56 ms > 64 bytes from 192.168.6.60: icmp_req=659 ttl=64 time=1.39 ms > 64 bytes from 192.168.6.60: icmp_req=660 ttl=64 time=1937 ms > 64 bytes from 192.168.6.60: icmp_req=661 ttl=64 time=1835 ms I believe the source of the problem is the periodic long noise floor calibration in the ath9k driver. Specifically, it looks like it's the function ath9k_hw_loadnf() which causes the problem (If it's not called during calibration then there are no network interruptions). I'm running Ubuntu 11.04 with wifi from self-compiled compat-wireless-2.6.39-1-sn. What are your opinions on this? Does it sound like a configuration error, hardware problem, driver bug, normal behaviour or maybe something else? Do you need more information to diagnose this? Regards Robert _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
