Re: dst cache overflow messages

hi,

this happens very rare. it is mostly seen on systems with full bgp table combined with a massive scan on diverse networks caused by worms/troyans/etc.

you can tuneup your systems' max route cache size by
echo sane-big-value > /proc/sys/net/ipv4/route/max_size

if you happen to get a permanent attack, you may also need to twiddle with garbage collection values in /proc/sys/net/ipv4/route/gc_* to ensure that the route cache will not grow more than the max value for the period of gc.

b.

----- Original Message ----
From: Andrew Morton <redacted>
To: netdev@oss.sgi.com
Sent: Sun, 20 Mar 2005 16:37:25 -0800
Subject: 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?