Re: Fedora 10 - Boot Analysis

[Arjan van de Ven <arjan infradead org>]

On Wed, 17 Dec 2008 21:52:30 +0200
Ville Skyttä <ville skytta iki fi> wrote:

> On Wednesday 17 December 2008, Arjan van de Ven wrote:
> > On Tue, 16 Dec 2008 17:16:36 -0500 (EST)
> >
> > Seth Vidal <skvidal fedoraproject org> wrote:
> > > > Or hibernate?
> > >
> > > At least on my system hibernate takes as much time as a reboot.
> >
> > btw this is a very fundamental property of hibernate. You need to
> > do all disk IO to get the system state to disk. And then at resume,
> > you need to do all disk IO to get the state from disk again. That's
> > twice ;)
> >
> > This is compounded by the property that a hibernate tends to flush
> > at least half the disk cache (it has to, to get space to work in),
> > which you then need to page right back in, so even when you're
> > back, the first minute or two sucks badly.
> >
> > I suspect you will always be able to boot faster than you can
> > hibernate+resume.
> 
> I have very different experience.  For example comparable (from grub
> going away to KDE + my bunch of default apps running and usable)
> numbers just taken from the desktop box in front of which I'm right
> now (AMD64 3200, 2G RAM, SATA, F-9 x86_64 KDE):
> 
> - shutdown: 28 sec
> - fresh boot: 66 sec

see this is the problem; this can be 5 to 10 seconds, and should be.
that's the point of this discussion


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org