From owner-freebsd-questions Mon May 17 14: 3:43 1999 Delivered-To: freebsd-questions@freebsd.org Received: from resnet.uoregon.edu (resnet.uoregon.edu [128.223.144.32]) by hub.freebsd.org (Postfix) with ESMTP id 2A9061566F for ; Mon, 17 May 1999 14:03:41 -0700 (PDT) (envelope-from dwhite@resnet.uoregon.edu) Received: from localhost (dwhite@localhost) by resnet.uoregon.edu (8.8.8/8.8.8) with ESMTP id OAA04298; Mon, 17 May 1999 14:03:30 -0700 (PDT) (envelope-from dwhite@resnet.uoregon.edu) Date: Mon, 17 May 1999 14:03:29 -0700 (PDT) From: Doug White To: Justin Cc: questions@FreeBSD.ORG Subject: Re: hey In-Reply-To: <199905161227.WAA02575@warp-9.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sun, 16 May 1999, Justin wrote: > hey can someone please tell me how the mbuf cluster things work... > i have been reading up on them and i cant seem to find how they work/what they do > only how to increase them... mbufs are Memory Buffers, generally used by the network system to transport data between network applications and network cards. The kernel comes with a fixed number of these allocated at boot time. On heavy-use systems, it's possible to exhaust the default allocation of mbufs, causing system crashes. The kernel option NMBCLUSTERS increases the boot-time allocation. you can monitor usage of mbufs using 'netstat -m'. If the peak number comes within 2/3 of the max (or so), you may want to bump NMBCLUSTERS to handle peak traffic periods. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message