linux-kernel - Re: [PATCH] x86: default to reboot via ACPI

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Message-ID: <20080827091810.GB1688@elf.ucw.cz>
Date:	Wed, 27 Aug 2008 11:18:10 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Avi Kivity <avi@...ranet.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] x86: default to reboot via ACPI

On Tue 2008-08-26 18:16:42, Andi Kleen wrote:
> "Maciej W. Rozycki" <macro@...ux-mips.org> writes:
> 
> > On Tue, 26 Aug 2008, Avi Kivity wrote:
> >
> >> Most machines are recent machines.
> >
> >  This is a bold statement I would say.  Any numbers to back it up?
> 
> You can do the math. Reasonable assumptions are ~10% growth rate
> in year-by-year units shipment (that's conservative, usually it is higher) 
> and that most systems are only used for 4-5 years (on commercial servers 
> it's typically 4 years, on privately used systems perhaps a bit more,
> laptops certainly less because they tend to break earlier). That 
> is the average, of course there are systems which are used much
> longer (or much shorter), but I would expect them to be the minority.
> 
> Also laptops are growing more and more compared to desktops (iirc the
> cross over of more laptops than desktops shipping happened recently)
> and if the assumption that they break earlier is true (it is
> definitely in my experience) so it's likely that the average system
> live time shrinks in the future.

I'd not count of this. When you relegate laptop to "quiet home server"
role, the mechanical stresses suddenly stop, and I'd expect it to
survive for long long years.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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