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Ticket #2403 (new defect)

Opened 12 years ago

Slow performance of MADWIFI driver over the past 6 months

Reported by: Assigned to:
Priority: minor Milestone:
Component: madwifi: driver Version: trunk
Keywords: Cc:
Patch is attached: 0 Pending: 0


The madwifi driver used to work so well on my Ubuntu laptop's AR5212 chip. Now I get very slow and erratic performance with both the MADWIFI driver as well as the ath5k driver (the later of which has never worked well for me).

I am currently running Ubuntu's 2.6.31-21-generic kernel with the ath5k driver blacklisted. I successfully compiled the MADWIFI svn r4128 driver for it and it is associated with my access point:

IEEE 802.11g ESSID:"default" Nickname:"" Mode:Managed Frequency:2.427 GHz Access Point: 00:50:18:0C:E9:8E Bit Rate=11 Mb/s Tx-Power:17 dBm Sensitivity=1/1 Retry:off RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=48/70 Signal level=-47 dBm Noise level=-95 dBm Rx invalid nwid:650 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0

athstats says:

3092 tx management frames 10 tx failed due to too many retries 657 long on-chip tx retries 2922 tx frames with no ack marked 10 tx frames with an alternate rate 803 rx failed due to bad CRC 13 PHY errors

13 CCK restart

2543 periodic calibrations rssi of last rcv: 50 233 switched default/rx antenna Antenna profile: [1] tx 129 rx 16402 [2] tx 1540 rx 10116

Here is the results of pinging my AP:

root@thinkpad:~# ping PING ( 56(84) bytes of data. 64 bytes from icmp_seq=1 ttl=64 time=4694 ms 64 bytes from icmp_seq=2 ttl=64 time=3788 ms 64 bytes from icmp_seq=3 ttl=64 time=3087 ms 64 bytes from icmp_seq=4 ttl=64 time=2181 ms 64 bytes from icmp_seq=5 ttl=64 time=4655 ms 64 bytes from icmp_seq=6 ttl=64 time=4986 ms 64 bytes from icmp_seq=7 ttl=64 time=4528 ms 64 bytes from icmp_seq=8 ttl=64 time=7388 ms 64 bytes from icmp_seq=9 ttl=64 time=7923 ms 64 bytes from icmp_seq=10 ttl=64 time=7333 ms 64 bytes from icmp_seq=11 ttl=64 time=6839 ms 64 bytes from icmp_seq=12 ttl=64 time=6658 ms 64 bytes from icmp_seq=13 ttl=64 time=4029 ms 64 bytes from icmp_seq=14 ttl=64 time=3151 ms 64 bytes from icmp_seq=15 ttl=64 time=2328 ms 64 bytes from icmp_seq=16 ttl=64 time=1348 ms 64 bytes from icmp_seq=17 ttl=64 time=2975 ms 64 bytes from icmp_seq=18 ttl=64 time=2179 ms 64 bytes from icmp_seq=19 ttl=64 time=1479 ms 64 bytes from icmp_seq=20 ttl=64 time=1398 ms 64 bytes from icmp_seq=21 ttl=64 time=500 ms 64 bytes from icmp_seq=22 ttl=64 time=114 ms 64 bytes from icmp_seq=23 ttl=64 time=35.5 ms 64 bytes from icmp_seq=24 ttl=64 time=467 ms 64 bytes from icmp_seq=25 ttl=64 time=798 ms 64 bytes from icmp_seq=26 ttl=64 time=3.44 ms 64 bytes from icmp_seq=27 ttl=64 time=742 ms 64 bytes from icmp_seq=28 ttl=64 time=151 ms 64 bytes from icmp_seq=29 ttl=64 time=1301 ms 64 bytes from icmp_seq=30 ttl=64 time=398 ms 64 bytes from icmp_seq=31 ttl=64 time=215 ms 64 bytes from icmp_seq=32 ttl=64 time=33.4 ms 64 bytes from icmp_seq=33 ttl=64 time=55.4 ms 64 bytes from icmp_seq=34 ttl=64 time=79.7 ms 64 bytes from icmp_seq=35 ttl=64 time=919 ms 64 bytes from icmp_seq=36 ttl=64 time=22.1 ms 64 bytes from icmp_seq=37 ttl=64 time=44.8 ms 64 bytes from icmp_seq=38 ttl=64 time=578 ms 64 bytes from icmp_seq=39 ttl=64 time=90.3 ms 64 bytes from icmp_seq=40 ttl=64 time=625 ms 64 bytes from icmp_seq=41 ttl=64 time=751 ms 64 bytes from icmp_seq=42 ttl=64 time=263 ms C --- ping statistics --- 43 packets transmitted, 42 received, 2% packet loss, time 47107ms rtt min/avg/max/mdev = 3.445/2170.249/7923.993/2386.252 ms, pipe 5

I am also seeing this in dmsg:

[ 44.906808] ath_pci 0000:02:02.0: PCI INT A -> Link[LNKF] -> GSI 11 (level, low) -> IRQ 11 [ 45.210731] MadWifi: ath_attach: Switching rfkill capability off. [ 45.400966] wifi0: Atheros AR5213 chip found (MAC 5.6, PHY 2112 4.1, 5 GHz Radio 1.7 2 GHz Radio 2.3) [ 45.442977] ath_pci: wifi0: Atheros 5212: mem=0xd0200000, irq=11 ... [ 701.941721] ath0: unknown SIOCSIWAUTH flag 12 [ 717.388730] ath0: unknown SIOCSIWAUTH flag 12 [ 765.855390] ath0: unknown SIOCSIWAUTH flag 12 [ 781.412976] ath0: unknown SIOCSIWAUTH flag 12 [ 794.185527] ath0: unknown SIOCSIWAUTH flag 12 [ 876.003170] ath0: unknown SIOCSIWAUTH flag 12 [ 932.133737] ath0: unknown SIOCSIWAUTH flag 12 [ 947.499238] ath0: unknown SIOCSIWAUTH flag 12

I am trying turning off bursting, CTS, and FastFrame? as suggested elsewhere but see no significant improvement.

This same computer can boot into M$-Windows and WIFI works perfectly, just as the MADWIFI driver used to work for me some 6-months ago on older kernels and earlier versions of the Ubuntu OS.

I check and there are no other signals on my AP's channel (4), but there are some weak signals on channel 6 some 20db less strong.

I am running Ubuntu Karmic, fully updated, and have tried several of their kernels including the Linux-Wireless "compat" one, as well as my own with similar results. I just got

Is there any other information I can provide that can help troubleshoot the problem?