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Date: Thu, 12 Jul 2007 12:03:42 -0400
From: Mark Lord <lkml@rtr.ca>
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: david@lang.hm, Jeremy Fitzhardinge <jeremy@goop.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Huang, Ying" <ying.huang@intel.com>, Pavel Machek <pavel@ucw.cz>,
       nigel@nigel.suspend2.net, Jeremy Maitin-Shepard <jbms@cmu.edu>,
       linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org
Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation
References: <1184167831.12556.13.camel@caritas-dev.intel.com> <200707121446.14170.rjw@sisk.pl> <469631FA.2070405@rtr.ca> <200707121735.40077.rjw@sisk.pl>
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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