From owner-svn-src-all@FreeBSD.ORG Tue Apr 30 07:22:06 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 786E638B; Tue, 30 Apr 2013 07:22:04 +0000 (UTC) (envelope-from joel@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id 5DE741FFC; Tue, 30 Apr 2013 07:22:04 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.6/8.14.6) with ESMTP id r3U7M4I3011366; Tue, 30 Apr 2013 07:22:04 GMT (envelope-from joel@svn.freebsd.org) Received: (from joel@localhost) by svn.freebsd.org (8.14.6/8.14.5/Submit) id r3U7M4Ks011365; Tue, 30 Apr 2013 07:22:04 GMT (envelope-from joel@svn.freebsd.org) Message-Id: <201304300722.r3U7M4Ks011365@svn.freebsd.org> From: Joel Dahl Date: Tue, 30 Apr 2013 07:22:04 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r250095 - head/sbin/dumpon X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Apr 2013 07:22:06 -0000 Author: joel (doc committer) Date: Tue Apr 30 07:22:03 2013 New Revision: 250095 URL: http://svnweb.freebsd.org/changeset/base/250095 Log: Adapt to the fact that minidumps are now on by default. PR: 177188 Modified: head/sbin/dumpon/dumpon.8 Modified: head/sbin/dumpon/dumpon.8 ============================================================================== --- head/sbin/dumpon/dumpon.8 Tue Apr 30 06:41:42 2013 (r250094) +++ head/sbin/dumpon/dumpon.8 Tue Apr 30 07:22:03 2013 (r250095) @@ -28,7 +28,7 @@ .\" From: @(#)swapon.8 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd May 12, 1995 +.Dd April 29, 2013 .Dt DUMPON 8 .Os .Sh NAME @@ -59,14 +59,21 @@ controlled by the variable in the boot time configuration file .Pa /etc/rc.conf . .Pp -For most systems the size of the specified dump device must be at +The default type of kernel crash dump is the mini crash dump. +Mini crash dumps hold only memory pages in use by the kernel. +Alternatively, full memory dumps can be enabled by setting the +.Va debug.minidump +.Xr sysctl 8 +variable to 0. +.Pp +For systems using full memory dumps, the size of the specified dump +device must be at least the size of physical memory. Even though an additional 64 kB header is added to the dump, the BIOS for a platform typically holds back some memory, so it is not usually necessary to size the dump device larger than the actual amount of RAM available in the machine. -.Pp -The +Also, when using full memory dumps, the .Nm utility will refuse to enable a dump device which is smaller than the total amount of physical memory as reported by the