RTS threshold low -> hang

Vaclav Dvorak vdvo at vdvo.net
Sat Nov 8 10:49:19 EST 2003


Hello list!

Because of the hidden-node problem and congestion, I tried setting the 
RTS threshold to various low values (<100 bytes). This makes the 
computer hang after a few hours.

I'm using hostap 0.1.2 with jbohac's psrrr patch 
(http://www.jikos.cz/~jbohac/hostap/) for enabling txpower control and 
keeping txpower after card reset. There is one X-Com XI-626 card in 
managed mode. The kernel is Linux 2.4.22 - stock, except for some 
netfilter patches. The computer is a Cyrix 6x86MX 150MHz. There are a 
few messages in the logs some time before the crash:

Nov  8 02:17:44 server kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Nov  8 02:17:44 server kernel: wlan0 Tx timed out! Resetting card
Nov  8 02:17:44 server kernel: hostap_pci: wlan0: resetting card
Nov  8 02:17:45 server kernel: hostap_pci: wlan0: resetting card

And in another logfile:
Nov  8 02:17:45 server kernel: wlan0: scheduled card reset
Nov  8 02:17:45 server kernel: wlan0: prism2_tx: hw not ready - skipping
Nov  8 02:17:45 server kernel: prism2_hw_init: initialized in 200 ms
Nov  8 02:17:45 server kernel: wlan0: Setting ALC to 0
Nov  8 02:17:45 server kernel: wlan0: Setting TX power to 128

The computer normally doesn't have a monitor or a keyboard. I don't know 
if the kernel spews some useful information on the console when the 
crash happens - is that likely? Should I bother to carry the monitor to 
the computer the next time it crashes, and the jot down the numbers on a 
piece of paper? :-) Or is there anything else I can do to help debug 
this? Thanks.

-- 
Vaclav Dvorak  <vdvo at vdvo.net>
http://www.vdvo.net/




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