[ath9k-devel] Issues with ar5418

[Jacob <jacob.winther@gmail.com>]

I have been running the latest wireless-testing for about 24 hours and generally
the card has been very stable. I've tested it with and without WPA/1.

There are a few issues though,  I also had the same issues with 2.6.27.1...

1) Whenever i run iperf, I get this many of these in the logs:
ath_tx_prepare: TX queue: 1 is full, depth: 492
ath_tx_prepare: TX queue: 1 is full, depth: 492

2) There is a big difference in speed upstream and downstream throughout, the
figures below are fairly constant:

Client connecting to XX, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  5] local 192.168.0.97 port 40407 connected with 192.168.0.3 port 5001
[  4] local 192.168.0.97 port 5001 connected with 192.168.0.3 port 41205
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec  27.0 MBytes  22.6 Mbits/sec
[  4]  0.0-12.3 sec  64.0 KBytes  42.8 Kbits/sec

3) If I run tcpdump the speeds drop considerably, below is a before and after
running tcpdump -i wla0

------------------------------------------------------------
[  3] local 192.168.0.97 port 57664 connected with 192.168.0.3 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  28.6 MBytes  23.9 Mbits/sec

== after==

------------------------------------------------------------
Client connecting to isola, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.97 port 57665 connected with 192.168.0.3 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-12.1 sec  72.0 KBytes  48.9 Kbits/sec


I also had this in my logs:
tcpdump uses obsolete (PF_INET,SOCK_PACKET)


I hope to try out 802.11n later this week.

Cheers,
Jacob

--

02:00.0 Network controller: Atheros Communications Inc. AR5418 802.11abgn
Wireless PCI Express Adapter (rev 01)
	Subsystem: Apple Computer Inc. Device 0087
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 256 bytes
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory@90100000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: <access denied>
	Kernel driver in use: ath9k
	Kernel modules: ath9k

wlan0     IEEE 802.11abgn  ESSID:"XX"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:1C:B3:AE:F8:30   
          Bit Rate=0 kb/s   Tx-Power=20 dBm   
          Retry min limit:7   RTS thr:off   Fragment thr=2352 B   
          Power Management:off
          Link Quality=59/100  Signal level:-56 dBm  Noise level=-94 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0