Date: Tue, 30 Apr 2013 07:22:04 +0000 (UTC) From: Joel Dahl <joel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r250095 - head/sbin/dumpon Message-ID: <201304300722.r3U7M4Ks011365@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201304300722.r3U7M4Ks011365>