[ntp:questions] drift modeling question
david at ex.djwhome.demon.co.uk.invalid
Fri Jul 18 21:14:03 UTC 2008
Martin Burnicki wrote:
> About which operating system(s) are you talking?
For powered up timing, MS-DOS, its predecessors if they implemented a
software clock at all, the MS-DOS Windows (3.0, 3.1, 95, 98, ME, 98SE),
most, if not all of the NT Windows (NT 3.5, NT 4.0, Windows 2000,
Windows XP, probably Windows 2003), Linux from start to 2.4, and mostly
for 2.6, SCO OpenServer.......
(The tick rate for MS-DOS family systems is a good clue to which timer
> The PC's standard RTC chip can certainly generate cyclic interrupts.
> However, if a cyclic interrupt from the RTC or from another timer chip is
But generally isn't used for that. ISTR that some early PCs didn't have
an RTC and had to be set when booted.
> used to drive the scheduler depends on the type and eventually on the
> version of an operating system, isn't it?
Divergence into alternative periodic sources on IBM PC type machines is
More information about the questions