Messages in this thread | | | Date | Wed, 22 Oct 2014 14:42:09 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex() |
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On Wed, 22 Oct 2014, Mike Surcouf wrote:
> I get that NTP can be installed locally. This is how I regulate time > on my guests. I agree the admin argument probably doesn't stand up. > > The problem is hyperv_clocksource (pluggable time source used by > hyperv guests) is systematically fast in my environment. by around > -250 PPM. > I get away with NTP (just). > However others have had to use tickadj to get hyperv_clocksource close > enough for NTP to work i.e. inside +/-500 PPM. (This IS outside normal > admin tasks) > > So if we are going to use NTP as the solution for hyperv guests (which > is a valid one) the systematic drift of hyperv_clocksource in > different environments will need to be addressed. Maybe this patch > could be modified to tune the tick count on boot before NTP starts and > then leave it alone so NTP can take over.
How about fixing hyperv_clocksource in the first place?
Thanks,
tglx
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