On 03/23/2011 06:34, John Baldwin wrote:
On Thursday, March 17, 2011 5:06:09 pm Jung-uk Kim wrote:
On Thursday 17 March 2011 04:01 pm, Peter Jeremy wrote:
On 2011-Mar-16 16:44:08 +0000, Jung-uk Kim<j...@freebsd.org> wrote:
Log:
Revert r219676.
Thanks also. For extra kudos, how about adding a similar function
to allow the HPET frequency to be over-ridden. That is currently
the only timecounter that does not allow the user to compensate for
incorrect hardware frequencies.
I really hate the idea of adjusting timecounter frequency from
userland. I guess "use ntpd(8)" is not a good answer for some
people. :-(
Actually, that doesn't work well if your timecounter frequency is off by a
lot. Having the timecounter frequency accurate improves the accuracy of
things like ntpd and ptpd.
ntpd requires that the time counter be within 128ppm of true. If the
time counter guess is off by more than that, you lose: ntpd won't work.
Warner
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