From: "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: slow susped to disk
Date: Mon, 3 Apr 2006 11:28:02 +0200
Message-ID: <200604031128.02974.rjw@sisk.pl>
References: <4430E44B.7070003@triumf.ca>
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Sender: linux-acpi-owner@vger.kernel.org
To: Zaher Salman <zaher@triumf.ca>
Cc: linux-acpi@vger.kernel.org, Pavel Machek <pavel@ucw.cz>

Hi,

On Monday 03 April 2006 11:00, Zaher Salman wrote:
> I upgraded the kernel from 2.6.15 to 2.6.16 on my presario 2100. Both 
> kernels were compiled with the similar configuration files. Anyway I 
> found that suspend to disk (and resume) is much slower on 2.6.16 
> compared to 2.6.15. Any idea for why that might happen or how can I 
> speed it up? There is also a big difference when suspending with the 
> laptop plugged or not..

This is because the size of the suspend image is now greater than
for 2.6.15.

There's the /sys/power/image_size knob that controls the size of the image.
If you set it to 0 (eg. by echo 0 > /sys/power/image_size as root), the
2.6.15 behavior should be restored.  However, if you set image_size > 0
it should improve the system responsiveness after resume.

Please refer to Documentation/power/interface.txt in the kernel tree for
details.

Greetings,
Rafael