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Bug 233729 - kernel bcm43xx network stack is easily broken by overloading
Summary: kernel bcm43xx network stack is easily broken by overloading
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: John W. Linville
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2007-03-24 04:10 UTC by Bernard Johnson
Modified: 2007-11-30 22:12 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2007-05-22 18:50:14 UTC

Attachments (Terms of Use)
network utilization at point stack falls over (deleted)
2007-03-24 04:10 UTC, Bernard Johnson
no flags Details
ping results to gateway (deleted)
2007-03-24 04:13 UTC, Bernard Johnson
no flags Details
flood ping results to gw (deleted)
2007-03-24 04:14 UTC, Bernard Johnson
no flags Details

Description Bernard Johnson 2007-03-24 04:10:37 UTC
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):

How reproducible:

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

Comment 1 Bernard Johnson 2007-03-24 04:10:37 UTC
Created attachment 150818 [details]
network utilization at point stack falls over

Comment 2 Bernard Johnson 2007-03-24 04:13:54 UTC
Created attachment 150819 [details]
ping results to gateway

Comment 3 Bernard Johnson 2007-03-24 04:14:44 UTC
Created attachment 150820 [details]
flood ping results to gw

Comment 4 Bernard Johnson 2007-03-24 04:19:36 UTC
Also forgot to mention...  Reselecting the access point with NetworkManager
causes a re-association to the wireless gateway and everything seems to be back
to normal.

John L, I'm changing the assignment to you as I suspect you want this bug.  If
not, please reassign.

Comment 5 Bernard Johnson 2007-03-24 04:47:55 UTC
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.

Comment 6 John W. Linville 2007-05-18 18:23:31 UTC
How is performance with the current rawhide kernels?

Comment 7 Bernard Johnson 2007-05-22 18:47:01 UTC
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.

Comment 8 John W. Linville 2007-05-22 18:50:14 UTC
Cool...thanks for the info!

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