In a recent note, McKown, John said: > Date: Wed, 11 Oct 2006 08:41:12 -0500 > > > 2.8 Linux for System z9 and zSeries > > The Linux(r) operating system does not support STP or the Sysplex > Timer. > > But Linux doesn't need it, does it? It can set its software clock using > XNTP like any other Linux. It could also use the SCK instruction to > updates its TOD (virtual or real) clock as well. To the best of my > knowledge, Linux like any other UNIX type system is not dependant on the > TOD clock not "jumping around". I know that I sync my home Linux/Intel > system once a day to the Internet atomic clock (pool.ntp.org) with not > problems. I am fairly sure that Linux/zSeries could do the same. > The same Redpiece warns against guests' attempting to set the TOD clock (presumably with SCK). And it mentions a "software" clock which is initialized from the TOD clock at startup. And I'm at a loss to understand how a clock could be implemented entirely in software and be immune to any irregularities in some underlying hardware clock.
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