From owner-freebsd-acpi@FreeBSD.ORG  Mon Jul 30 09:15:10 2012
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Date: Mon, 30 Jul 2012 19:15:02 +1000 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: Alexander Motin <mav@freebsd.org>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: Using bintime() in acpi_cpu_idle()?
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On Mon, 30 Jul 2012, Alexander Motin wrote:

>[>...] ...
> Nevermind, let it be compromise solution -- ticker for C1 state where 
> performance is the most important and where TSC works and ACPI timer for 
> others.

I like that.

Something similar should work for making the TSC usable in timecounters
even if it stops during deep sleeps.  The timecounter hardware would
have to be switched or reinitalized if it might have stopped.

Bruce