From owner-freebsd-stable  Mon Apr 26 13: 2:42 1999
Delivered-To: freebsd-stable@freebsd.org
Received: from po1.bbn.com (PO1.BBN.COM [192.1.50.38])
	by hub.freebsd.org (Postfix) with ESMTP id E940514CFE
	for <stable@FreeBSD.ORG>; Mon, 26 Apr 1999 13:02:39 -0700 (PDT)
	(envelope-from dennis@bbn.com)
Received: from bbn.com (DROCKWELL.BBN.COM [128.89.31.139])
	by po1.bbn.com (8.9.1/8.9.1) with ESMTP id QAA07107;
	Mon, 26 Apr 1999 16:01:47 -0400 (EDT)
Message-Id: <199904262001.QAA07107@po1.bbn.com>
To: mwlucas@exceptionet.com
Cc: jonny@jonny.eng.br, stable@FreeBSD.ORG
Subject: Re: nmbclusters=4096 doesn't increase mbufs 
In-reply-to: Message from mwlucas@exceptionet.com 
	<199904261944.PAA24025@easeway.com> .
X-face: &R'hN{mZu#r@8b_JU\bn"!fYpP{?5k4p/(|]?.2'6;>Dc9}~t*vY=/#-:"63ya.%)%o`Kv$
 u&'Ff5k&n[}QC;j7YYsR5Hl]G"E:*9Zmw;dx[sw&9Tmx_PB/7B`RdFW;#@49hJU&kW+J"<[`9^?.dQ
 3]L$zK,4'=tThX$wC!M\`e*@1y
Date: Mon, 26 Apr 1999 16:01:47 -0400
From: Dennis Rockwell <dennis@bbn.com>
Sender: owner-freebsd-stable@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

On 26 Apr, mwlucas@exceptionet.com wrote:

> The machine in question frequently slows to a crawl.  The IPFilter people
> have specifically cited mbuf starvation as a classic cause of this
> symptom.

Run netstat -m when the system is crawling and see what you
get, especially the denied and delayed numbers.

> How can I determine how many mbufs a FreeBSD machine has at a given time?

That's what netstat -m tells you; how many mbufs and
clusters have been allocated, and how many of them are in
use (ie, not on the freelists).

> If 132 is the current high-water mark, and we actually have 4096
> available, I'll shut up and go away happy.

That is precisely the case on other related systems I've
dealt with; I cannot claim to be authoritative about this
particular version of FreeBSD, but the output of netstat -m
is similar enough that I would expect that the underlying
mechanisms are the same.

Dennis Rockwell                 dennis@bbn.com
GTE Internetworking
Powered by BBN                  +1-617-873-5745
Cambridge, MA                   +1-617-873-6091 (Fax)


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message