Re: Why is the ATX PSU designed to standby current?

From: Winfield Hill (hill_a_at_t_rowland-dotties-harvard-dot.s-edu)
Date: 02/11/05 

Date: 10 Feb 2005 17:56:11 -0800

John Larkin wrote...
>
> Why doesn't Windows suspend to disk? Just copy all of ram to disk and
> *fully* shut down, zero power. Restart would take about 2 seconds;
> spin up the disk, restore RAM, run.

 It does. It's called hibernate mode, and the problem is that much
 of the RAM contents have to be written to disk. For example, I have
 1G of ram, and when I command a hibernate it usually has to save
 several hundred MB of memory to the hard drive, perhaps even 500MB
 or so, and this takes time. And it has to restore this at wakeup.

 If you have a fast 10MB/sec drive, it takes 50s to restore 500MB.
 It might even need 100s when writing, for a read-after-write check?
 There may also be performance hits from disk fragmentation issues.

 I'm not sure, but it seems Windows also wastes more time attempting
 to optimize the amount of RAM stored by requesting program action.
 There appear to be some timeouts while it waits for responses that
 don't come. And there are similar excess delays upon resume. 

-- 
 Thanks,
    - Win

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