On Sun, Feb 23, 2014 at 01:20:53AM -0600, Joel Fernandes wrote: > Hi, > After reading documentation, I follow that NO_HZ_FULL turns off the > scheduling-clock interrupt on all except the boot CPU, where as > NO_HZ_IDLE turns it off on all idle CPUs. > > I understand the period scheduling-clock interrupt is required to > compensate for hardware oscillator drift. I believe that's why > NO_HZ_FULL keeps it ON on atleast one CPU. That way the drift is > compensated for. > > But, with NO_HZ_IDLE, all CPUs turn off interrupt during idle. Then > how is the drift accounted for? > > CC'ing Paul as well for any guidance, thanks :) The clock code fixes things up as needed when the first CPU returns from idle. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
