Re: [MIPS] Use generic NTP code for all MIPS platforms

["Maciej W. Rozycki" <macro@linux-mips.org>]

On Tue, 14 Aug 2007, Atsushi Nemoto wrote:

> Some difficulties are:
> 
> * timekeeping subsystem calls {read,update}_persistent_clock() with
>   irq-disabled.  But most RTC class routines might sleep.
> 
> * RTC class can have multiple RTCs on the system.
> 
> * There are already some conflicting features in RTC class ---
>   rtc_suspend and rtc_resume try to adjust the wall clock.
> 
> * IIRC Some people said "NTP sync can be done all in userland" ;-)

 NTP sync in the kernel disturbs the timer interrupt with some setups, 
affecting the dispersion and thus the quality of timekeeping horribly.

  Maciej