From owner-freebsd-questions@FreeBSD.ORG Tue Oct 14 06:47:15 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D8C6116A4B3 for ; Tue, 14 Oct 2003 06:47:15 -0700 (PDT) Received: from clunix.cl.msu.edu (clunix.cl.msu.edu [35.9.2.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2140E43FA3 for ; Tue, 14 Oct 2003 06:47:14 -0700 (PDT) (envelope-from jerrymc@clunix.cl.msu.edu) Received: from clunix.cl.msu.edu (localhost [127.0.0.1]) by clunix.cl.msu.edu (8.12.9/8.12.9) with ESMTP id h9EDlBOg010345; Tue, 14 Oct 2003 09:47:11 -0400 (EDT) Received: (from jerrymc@localhost) by clunix.cl.msu.edu (8.12.9/8.12.9/Submit) id h9EDlBb6010344; Tue, 14 Oct 2003 09:47:11 -0400 (EDT) From: Jerry McAllister Message-Id: <200310141347.h9EDlBb6010344@clunix.cl.msu.edu> To: freebsd-questions-local@be-well.no-ip.com (Lowell Gilbert) Date: Tue, 14 Oct 2003 09:47:10 -0400 (EDT) In-Reply-To: <44he2cyoma.fsf@be-well.ilk.org> from "Lowell Gilbert" at Oct 14, 2003 08:45:17 AM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: freebsd-questions@freebsd.org Subject: Re: Problem with adding more swap ! X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Oct 2003 13:47:16 -0000 > > Jerry McAllister writes: > > > Well, if you can spread it across multiple controllers, it can > > speed things up. > > Right. > > > But, generally I think that swap is used in > > a serial manner, eg the first chunk gets used up before the > > next one is started, etc. > > That's wrong. See the Handbook section titled "Swap Partition". > http://www.freebsd.org/handbookconfigtuning-initial.html#SWAP-DESIGN > > > So, that would mean that you would > > want to put only a little on the boot drive (you need some there > > for special occasions) and most of the rest on another drive > > and another controller if you can. > > Because FreeBSD tries to "stripe" the usage across all of the swap > space, you're best off giving it space on all of the disks. However, > if your disks are not all the same speed, you're better off sticking > to the fastest ones for swap space. Hmmm. Guess I am out of date on this part. Some older systems I worked on (not necessarily FreeBSD) did not stripe swap. It's very nice that FreeBSD does. ////jerry