Re: [RFC][PATCH] linux-2.6.3-rc2_ia64-cyclone_A0

From: john stultz <johnstul_at_us.ibm.com>
Date: 2004-02-13 13:29:35
On Thu, 2004-02-12 at 17:16, David Mosberger wrote:
> >>>>> On Thu, 12 Feb 2004 17:05:50 -0800, john stultz <johnstul@us.ibm.com> said:
> 
>   John> Hmm. As cyclone is only enabled for x450/x455 systems, I'm not
>   John> sure if that additional check is necessary, but I'll try to
>   John> look into that.
> 
> At the very least, verify that the SAL ITCdrift bit is turned on by
> the firmware.  Otherwise, the lightweight handler of gettimeofday()
> will still use ITC-based interpolation.

I'm not sure I see how gettimeofday will use ITC based interpolation if
the ITCdrift is off. Sure, the ITC will register a timesource, but
init_cyclone_clock runs after time_init and has a negative drift value,
so on the x450/x455 the cyclone interpolator will be used. 

Am I missing something?

thanks
-john


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Received on Thu Feb 12 21:34:34 2004

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