Red Hat Bugzilla – Bug 233729
kernel bcm43xx network stack is easily broken by overloading
Last modified: 2007-11-30 17:12:00 EST
Description of problem:
It appears that the bcm43xx wireless stack can be easily broken by flooding the
network. Notice also the sometimes long delays on the regular ping.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. start a 'ping gw' in one windows
2. start a 'ping -f gw' in another window
3. wait for stack to fall over
Created attachment 150818 [details]
network utilization at point stack falls over
Created attachment 150819 [details]
ping results to gateway
Created attachment 150820 [details]
flood ping results to gw
Also forgot to mention... Reselecting the access point with NetworkManager
causes a re-association to the wireless gateway and everything seems to be back
John L, I'm changing the assignment to you as I suspect you want this bug. If
not, please reassign.
I also tried this with the kernel-2.6.20-1.2925.6.1.fc6.jwltest.29 kernel. It
is more stable (less network delays and more consistent network saturation) but
in the end it falls over as well.
It appears to be 100% repeatable.
How is performance with the current rawhide kernels?
There are still some anomolies as far as the saturation and ping times, but with
kernel-2.6.21-1.3175.fc7 I was not able to make it fall over. I did have to
update my firmware for the newer kernel too.
I can't verify if the anomolies are because of changes in the wireless signal or
not, so I would consider this resolved.
Cool...thanks for the info!