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Date:      Wed, 4 Jul 2001 11:15:44 -0500
From:      Greg Lehey <grog@freebsd.org>
To:        "Karsten W. Rohrbach" <karsten@rohrbach.de>
Cc:        Greg Smith <freebsd_mail@yahoo.com>, Oliver Fischer <nexus@fileseeker.net>, freebsd-mobile@freebsd.org, roam@orbitel.bg
Subject:   ThinkPad hibernation (was: Hibernation on FreeBSD)
Message-ID:  <20010704111544.B1649@sydney.worldwide.lemis.com>
In-Reply-To: <20010702173846.D79697@mail.webmonster.de>; from karsten@rohrbach.de on Mon, Jul 02, 2001 at 05:38:46PM %2B0200
References:  <001901c1015c$e8bd1790$8a04a8c0@warpgondel> <200106300916540300.00177DE8@smtp.mail.yahoo.com> <025f01c102c0$9177f9e0$8a04a8c0@warpgondel> <200107020051250270.000E8A15@smtp.mail.yahoo.com> <20010702173846.D79697@mail.webmonster.de>

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On Monday,  2 July 2001 at 17:38:46 +0200, Karsten W. Rohrbach wrote:
>
> some generic ideas on portable hibernate support:
> - one could use the swap partition (it is used for crashdumps anyway, if
>   you enabled them)
> - this could be implemented in ddb, since it already writes core files
>   to the swap partition
> - resume support has to be built into the bootloader which has to load
>   the ram core from the swap partition, set up all structures and start
>   it

There's a crucial difference between hibernation and crashing: when
you crash, you don't intend to restart the system, so it's (just
barely) acceptable to overwrite swap.  If you hibernate, you want swap
to have the same contents on resume.

Greg
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