From owner-freebsd-performance@FreeBSD.ORG Wed Apr 30 23:25:45 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C44EC37B401 for ; Wed, 30 Apr 2003 23:25:45 -0700 (PDT) Received: from hotmail.com (bay1-f75.bay1.hotmail.com [65.54.245.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5881D43F75 for ; Wed, 30 Apr 2003 23:25:45 -0700 (PDT) (envelope-from rob_macgregor@hotmail.com) Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 30 Apr 2003 23:25:45 -0700 Received: from 80.192.46.45 by by1fd.bay1.hotmail.msn.com with HTTP; Thu, 01 May 2003 06:25:44 GMT X-Originating-IP: [80.192.46.45] X-Originating-Email: [rob_macgregor@hotmail.com] From: "Rob MacGregor" To: freebsd-performance@freebsd.org Date: Thu, 01 May 2003 06:25:44 +0000 Mime-Version: 1.0 Content-Type: text/plain; format=flowed Message-ID: X-OriginalArrivalTime: 01 May 2003 06:25:45.0253 (UTC) FILETIME=[7F629550:01C30FAA] Subject: Re: SWAP size X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: KEEP_TRAFFIC_ON_THE_LIST@dev.null List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 May 2003 06:25:46 -0000 >From: Terry Lambert > >So it's grown from "as much swap as you feel you need" to "as much >swap as you have RAM" to "1.5 times RAM" to "2x RAM". > >All in all, it's just a rule of thumb; however, there are some >consequences to not following it, for each time things have >changed, the consequences get more and more dire. 8-). > >This is why people don't give much creedence to the people who >are trying to run without swap; we're willing to help them track >down things that make it impossible, but we recognize that just >because something's possible doesn't mean it's a good idea. So you're suggesting that if I've got 16 GB of RAM I should have 32 GB of swap? That's an entire hard disk *just* for swap (though from a performance viewpoint, that's not bad). What about systems with even more RAM? I agree that having nowhere to store crash dumps is a Bad Thing. However there will be cases where that tradeoff is worth not having a swap device. In my own case at home I have a FreeBSD (4.8) system without any swap. I run without swap because the "disk" is a CompactFlash device - using that for swap wouldn't be smart. Then there's the issue of diskless systems where it's not possible to have swap. Please DO NOT send me ANY email directly unless it's a privacy issue. Reply-to mangled to assist those who don't read the above. -- Rob | What part of "no" was it you didn't understand? _________________________________________________________________ Overloaded with spam? With MSN 8, you can filter it out http://join.msn.com/?page=features/junkmail&pgmarket=en-gb&XAPID=32&DI=1059