On Thu, 24 Mar 2011, Warner Losh wrote:
On 03/23/2011 06:34, John Baldwin wrote:
On Thursday, March 17, 2011 5:06:09 pm Jung-uk Kim wrote:
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.
Is ntpd really that broken? What does it do if the drift file has the
correct compensation to within 128 ppm?
I use an old version of ntpd in which I've observed a positive feedback
loop when -x is used to prevent steps and the slew wants to be more than
128 ppm due to a transient.
Bruce
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