From owner-freebsd-stable  Sun Aug 22  2:25:41 1999
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From: Igor Roshchin <igor@physics.uiuc.edu>
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Subject: Re: rx list ???
In-Reply-To: <199908220545.AAA11248@alecto.physics.uiuc.edu> from "Igor Roshchin" at "Aug 22, 1999  0:45:48 am"
To: igor@alecto.physics.uiuc.edu (Igor Roshchin)
Date: Sun, 22 Aug 1999 04:23:37 -0500 (CDT)
Cc: stable@freebsd.org
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Thanks to everybody replied! 

netstat -m  cleared it up.

It looks like the formula for calculating NMBCVLUSTERS from MAXUSERS
just didn't work for me for some strange extreme situation
(It happened for the first time after ~2.5 years of server running)

So, I just set in opt_param.h the line:
#define NMBCLUSTERS 8192 

Igor


> Hello!
> 
> 
> I found the following messages (so far just once) on a server that is running
> web-server (apache), and an ftp server.
> 
> This is 3.1-19990412-STABLE with a custom-built kernel with
> maxusers  set to 128,
> running on a PPRO-180 with 128MB of RAM and ~260MB of swap space.
> 
> 
> Aug 21 16:00:29 <kern.crit> HOST /kernel: Out of mbuf clusters - adjust NMBCL
> USTERS or increase maxusers!
> Aug 21 16:00:29 <kern.crit> HOST /kernel: xl0: no memory for rx list -- packe
> t dropped!
> Aug 21 16:00:43 <kern.crit> HOST last message repeated 1354 times
> 
> I don't see anything in the logs that would indicate an  extraodinary load ,
> however, it looks like neither of the servers logged anything
> between 16:00:29 and 16:00:41
> 
> I wonder, whether it is possible that this is due some type of a DOS attack.
> 
> Also, what can be done ?
> I am not certain if boosting the value of maxusers up would be
> a wise solution.
> 
> Any thoughts are appreciated.
> 
> Igor
> 



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