Hi,
recently I noticed severe performance hits on my WLAN. I connect with
my ibook2 (airport) to an Netgear ME102 access point and sometimes
after producing some heavy traffic the bitrate goes down to the
minimum of 1Mbit/s, resulting in very poor net performance, hanging
http requests and such. Iwconfig shows something like the following:
eth1 IEEE 802.11-DS ESSID:*** Nickname:***
Mode:Managed Frequency:2.437GHz Access Point: ***
Bit Rate=1Mb/s Tx-Power=15 dBm Sensitivity:1/3
Retry limit:4 RTS thr:off Fragment thr:2347 B
Encryption key:***
Power Management:off
Link Quality:63/92 Signal level:-35 dBm Noise level:-98 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:752
Tx excessive retries:96 Invalid misc:0 Missed beacon:0
notable the high fragmentation and lots of excessive retries (whatever
that means). Setting the fragmentation threshold to a fixed value or
to automatic made no difference. I am not sure if this behaviour is a
result of general WLAN problems (configuration?) or a hardware
failure. But since sending the ibook to sleep or reloading the airport
driver modules remedies the situation for some time I guess this might
be a driver problem. I am using the latest rsync'ed benh kernel with
the airport drivers (airport, orinoco, hermes) dating back from May
15th.
Any ideas?
Regards
--
Alexander Stagun
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