Re: [chrony-dev] Slow bootup with git

[Ed W <lists@xxxxxxxxxxxxxx>]

On 24/04/2012 11:17, Miroslav Lichvar wrote:
> On Tue, Apr 17, 2012 at 09:07:08AM -0700, Bill Unruh wrote:
> > Mind you the rtc should not take 8 sec to read (it will take a couple, so
> > perhaps most of that time is chrony starting up), so it is not clear what is
> > happening.
> It collects 8 RTC samples to get an accurate offset for the initial
> system clock adjustment. I.e. it waits for 1 + 8 RTC interrupts, the
> first one is ignored to avoid a kernel bug, which might have been
> fixed long time ago. I think decreasing that number to perhaps 2 or 3
> should be fine, but I haven't tried it.

Curious why reducing it is ok?  What is the current algorithm for 
reading the rtc time?

I thought I saw a little while back you had some busylooping to try and 
find the exact time it rolled? I thought I saw it got removed though - 
didn't work out?  Potentially that reduces the delay to the minimum 
possible?

I think with boot times coming down there is a desire to try and keep 
this number reasonable.  Even if we background chrony it still means a 
step/slew hitting late in the boot process when it could be done near 
the start (when on average we are less clock sensitive)

Thanks for your work on chrony!

Ed W



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