linux-kernel - Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

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Date:	Thu, 12 Jul 2007 12:03:42 -0400
From:	Mark Lord <lkml@....ca>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	david@...g.hm, Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Huang, Ying" <ying.huang@...el.com>, Pavel Machek <pavel@....cz>,
	nigel@...el.suspend2.net, Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

Rafael J. Wysocki wrote:
> On Thursday, 12 July 2007 15:51, Mark Lord wrote:
>..
>> Currently, TuxOnIce(suspend2) takes about 10 seconds to suspend my notebook.
>> Switching to this new scheme would double that to 10 seconds to boot/probe,
>> plus the original 10 seconds to hibernate.  Assuming the new implementation
>> even comes close to suspend2 speed.
> 
> How much RAM is there in your machine?

2GB, but It doesn't need to dump that much for good performance.
Hibernate here consists of:

   echo "$(( 256 * 1024 * 1024 ))" > /sys/power/image_size
   echo -n disk > /sys/power/state

Plus a couple of fiddly commands to deal with the ATI binary X server.

We use this on other machines here too, with 2GB RAM (most of them)
and 1.3GB RAM (very slow HD, so it takes longer on that one).

Cheers

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