Re: dst cache overflow

From: Andi Kleen (
Date: Thu Oct 12 2000 - 18:01:35 EST

On Thu, Oct 12, 2000 at 12:39:09PM -0400, Ed Taranto wrote:
> Anyone out there have any further information or insight into this?

You can check the routes in the rtcache by using route --cache. Maybe
you can see a pattern.

> One thing that concerns me is that rt_garbage_collect will only make one
> pass through the main loop while in_interrupt() ... thus perhaps that is
> why it doesn't make it's goal of getting the cache entries below
> ip_rt_max_size. if i am under heavy load, perhaps i am spending too much
> time in_interrupt() which is why I can't trim down the cache sufficiently??

For a router/packet filter firewall rt_garbage_collect will only be called from
interrupt context. Normally a single sweep should be more than enough though.

> Or does this perhaps sound like a memory leak or something?

A common cause are port scans which cause generation of lots of routes
very quickly.


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