Messages in this thread | | | Date | Tue, 28 Mar 2006 19:21:37 -0600 | From | Matt Mackall <> | Subject | Re: 11 minute RTC update (was Re: Remove RTC UIP) |
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On Wed, Mar 29, 2006 at 03:11:02AM +0200, Alessandro Zummo wrote: > On Tue, 28 Mar 2006 18:03:45 -0600 > Matt Mackall <mpm@selenic.com> wrote: > > > > > > While we are on the topic, I would like to ask everyone about > > > > > the 11 min ntp/rtc update feature of the kernel. > > > > > > > > > > It is something that makes sense to move to > > > > > userland? > > > > > > > > YES !!! :) > > > > > > great! given that it is not implemented in the new RTC subsystem > > > and nobody objected, I will not add it :) > > > > I agree that this should be migrated to userspace, but I'm more > > worried about the functionality impact here than for the UIP case. > > > > With existing NTP setups, and the kernel no longer writing to the RTC, > > you might have the RTC drift far enough that NTP failed to sync on the > > next boot. (Correct me if I'm wrong, of course.) > > That's probably true, I'm not expert on the matter. The new subsystem only > covers platforms that were not covered before (i.e. without external patches), > so that this should not impact users because the NTP update mode > was not working on them. > > The problem might arise when other RTC drivers (i.e. x86) will be converted > and deployed. > > We need a migration plan. Any suggestion?
I guess the question then becomes: is existing userspace (ntpd) already doing its own updates. If so, we can schedule the feature for removal in the near future. If not, it may take quite a bit longer.
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