Fw: dst cache overflow messages

Begin forwarded message:

Date: Sun, 20 Mar 2005 22:51:08 +0200 (EET)
From: buakaw@buakaw.homelinux.net
To: linux-kernel@vger.kernel.org
Subject: 


the system become very laggy.
i use kernel 2.6.10/2.6.11.3 on p4 2.8, msi915p, 3 x 3com905 boomerang.
and the cpu usage normally be about 12% and after something happens it
boost to 100% and it is used mostly by ksoftirqd/0, and a little bit by 
migration/0 and event/0. and in syslog i found thies lines

Mar 20 22:21:09 buakaw kernel: printk: 5543 messages suppressed.
Mar 20 22:21:09 buakaw kernel: dst cache overflow

what can cause this?