linux-kernel - Re: Linux time code

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Message-Id: <1156879386.7748.4.camel@localhost>
Date:	Tue, 29 Aug 2006 12:23:05 -0700
From:	john stultz <johnstul@...ibm.com>
To:	linux@...izon.com
Cc:	zippel@...ux-m68k.org, linux-kernel@...r.kernel.org,
	theotso@...ibm.com
Subject: Re: Linux time code

On Mon, 2006-08-28 at 23:28 -0400, linux@...izon.com wrote:
> > With the new clocksource code, we can (currently just i386, but the
> > architecture is generic and I'm working on the other arches) make use of
> > continuous clocksources for accumulating time instead of having the deal
> > with the problematic PIT (as well as the lost ticks issue).
> 
> If it's there, it's great, but what about i386EX embedded boards and
> the like?

The PIT clocksource is available for those situations, but is one of the
lowest rated clocksources, so anything else will be used if its
available.

>   It's approximately manageable on uniprocessor, but can
> I be sure there's always something (what?) better than the PIT on
> *every* SMP system?

Yea. With the exception of NUMAQ almost every i386 SMP system either can
use the TSC or has an alternative clocksource (acpi pm, hpet, cyclone).


> I need to study what you've done and see how to use it.

Let me know if you have any questions or thoughts about it.

thanks
-john


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