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Adapt to the fact that minidumps are now on by default.

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PR:		177188
This commit is contained in:
Joel Dahl 2013-04-30 07:22:03 +00:00
parent 249b2994d4
commit 4684a6ef0c
1 changed files with 11 additions and 4 deletions
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15
sbin/dumpon/dumpon.8
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@ -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