| Re: [chrony-dev] Slow bootup with git |
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On Tue, 17 Apr 2012, Ed W wrote:
On 16/04/2012 11:32, Miroslav Lichvar wrote:
On Mon, Apr 16, 2012 at 02:48:14AM +0100, Ed W wrote:
> Hi, I have adjusted my boot scripts to use chrony in place of
> hwclock to set rtc at boot. However, I note that "chrony -r" takes
> about 8-10 seconds on my system (which blocks boot). I haven't
> re-measured the previous version, but I don't recall this delay.
>
> I'm surfing the recent git commits and I presume it's this which
> changes the timings:
> http://git.tuxfamily.org/chrony/chrony.git/?p=chrony/chrony.git;a=commitdiff;h=1d2a0856b40e4cc7638f6878b9cd5891fdefbea6
Yes, that's the patch. The idea was that you can safely start
applications sensitive to clock steps after the chronyd foreground
process exited.
> Could you give some thought as to whether there is some performance
> improvement could be made here? I would prefer not to revert to
> hwclock if possible?
You can start chronyd in background, if you don't care that the
services started after might see a step in the system clock. I think
that would be pretty much the same as it was before that commit.
Main difference would be that start-stop-daemon wouldn't see my pid file and
might assume that startup failed?
Which chunk of code takes 8-10 seconds (on my very slow box) to do the RTC
stuff? I guess I'm interested in whether that has any optimisation options?
Why not do the hwclock stuff (it is not clear to me that the hwclock is not
more accurate than chrony at estimating the rate error of the rtc nowadays)
and that way if you run it in the background, any step will be small.
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.
Cheers
Ed W
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