From owner-freebsd-questions@freebsd.org Fri Feb 9 20:55:09 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 617B3F01677 for ; Fri, 9 Feb 2018 20:55:09 +0000 (UTC) (envelope-from naddy@mips.inka.de) Received: from mail.inka.de (quechua.inka.de [IPv6:2a04:c9c7:0:1073:217:a4ff:fe3b:e77c]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 05DB478D3D for ; Fri, 9 Feb 2018 20:55:08 +0000 (UTC) (envelope-from naddy@mips.inka.de) Received: from mips.inka.de (naddy@[127.0.0.1]) by mail.inka.de with uucp (rmailwrap 0.5) id 1ekFhK-0003wd-Dh; Fri, 09 Feb 2018 21:55:06 +0100 Received: from lorvorc.mips.inka.de (localhost [127.0.0.1]) by lorvorc.mips.inka.de (8.15.2/8.15.2) with ESMTP id w19KrpsU068544; Fri, 9 Feb 2018 21:53:51 +0100 (CET) (envelope-from naddy@lorvorc.mips.inka.de) Received: (from naddy@localhost) by lorvorc.mips.inka.de (8.15.2/8.15.2/Submit) id w19KrpmN068543; Fri, 9 Feb 2018 21:53:51 +0100 (CET) (envelope-from naddy) Date: Fri, 9 Feb 2018 21:53:51 +0100 From: Christian Weisgerber To: Scott Bennett Cc: freebsd-questions@freebsd.org Subject: Re: Swap on SSD Message-ID: <20180209205351.GA68122@lorvorc.mips.inka.de> References: <201802081425.w18EPYPg005443@sdf.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201802081425.w18EPYPg005443@sdf.org> User-Agent: Mutt/1.9.3 (2018-01-21) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Feb 2018 20:55:09 -0000 Scott Bennett: > >Demand paging was introduced in UNIX 32V and entered the BSD line > > Are you absolutely certain of that? Judging from _A Quarter Century of UNIX_, I slightly misrembered. UNIX/32V was the port to the VAX, but it didn't yet include demand paging. That feature was added only in 3BSD. That doesn't really matter, though, for the point I was trying to bring across: Saying "FreeBSD doesn't actually swap these days; uses demand paging" is rather misleading because that makes it sound like a recent innovation when it is in fact almost forty years old. So, yes, "swap" space is a misnomer, but then again, "electricity" today isn't really about rubbing ambers together either. -- Christian "naddy" Weisgerber naddy@mips.inka.de