Subject: Re: used mbufs increasing,
To: Reinhold M. Roppert <>
From: Manuel Bouyer <>
List: netbsd-users
Date: 06/03/2005 12:53:50
On Fri, Jun 03, 2005 at 08:18:35AM +0200, Reinhold M. Roppert wrote:
> Hello,
> I'm using  NetBSD 2.0 on an P4 3GHz machine with 1 G Ram as an 
> Webserver.
> Sometimes there are many requests so after the networks hangs i got 
> the error " mclpool limit reached; increase NMBCLUSTERS".
> I increased the NMBCLUSTERS from 1024 to 16384 as described
> in the netbsd-faq.
> Now my question and perhaps the problem is:
> The used mbufs increases during many requests but they did not 
> decrease later. 
> This time and over the night there are no requests, but the used 
> mbufs are still over 4000. 
> Is it possible to flush the mbufs without rebooting?  

What does netstat show ? I'm seen connections sitting with the send-queue
full, and this can consume a lot of memory. I attribute this to broken
DSL routers (As I started seeing this when french DSL providers started
giving NAT routers to their clients, instead of a simple modem).

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference