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

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2004-02-13 18:09:11
>>>>> On Thu, 12 Feb 2004 18:29:35 -0800, john stultz <johnstul@us.ibm.com> said:

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

  John> Am I missing something?

Yes: it's the _lightweight_ gettimeofday() handler that will get
you.  See arch/ia64/kernel/fsys.S:fsys_gettimeofday().

To date no distribution ships with light-weight syscall supported
enabled, but the support is in the current glibc, so it's only a
matter of time before this would start to bite.

	--david
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Received on Fri Feb 13 02:10:48 2004

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