Red Hat Bugzilla – Bug 461442
VLAN driver logs excessive messages in kernel message log (dmesg)
Last modified: 2010-03-30 03:30:20 EDT
Description of problem:
If one subscribes to a few hundred multicasts on one or more
VLAN interfaces, the VLAN driver logs an excessive number of
messages and wipes out the more useful information in the
kernel message log that is viewed with the 'dmesg' command.
vlan2003: add 01:00:5e:00:05:e4 mcast address to master interface
vlan2003: del 01:00:5e:77:a0:10 mcast address from master interface
Version-Release number of selected component (if applicable):
Configure an 801.1q trunked VLAN or two with the
'vconfig' command. Then subscribe to a hundred
or more multicasts on them.
Excessive number of messages that completely wipe out
the kernel message log.
No messages should be logged.
Don't need to know about these events. One
can always look at '/proc/net/dev_mcast' to see the
multicast subscriptions. It should take about five
minutes to remove the message or make it a debug-only
those messages was printk with KERN_DEBUG, the lowest level (8) of log messages, that's for debug only. You can use "dmesg -n 7" to filter out all debug messages...
Created attachment 362877 [details]
You can download this test kernel from http://people.redhat.com/dzickus/el5
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described in this bug report. This report is therefore being
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