On Wed, Jan 25, 2017 at 02:12:05AM -0800, Hal Murray wrote: > I think kernels went through 3 stages: > > Old old kernels were very coarse. They bumped the clock on an interrupt. > End of story. > > Old kernels use the TSC (or equivalent) to interpolate between interrupts. > (A comment from Mills clued me in. I was plotting temperature vs drift. It > got a lot cleaner when I moved the temperature probe from the CPU crystal > over to the RTC/TOY clock crystal. I haven't looked for the code.) > > Current kernels don't use interrupts for keeping time. It's all done with > the TSC.
All my real amd64 boxes show: [ 0.540511] Switched to clocksource hpet [ 3.327348] Switched to clocksource tsc But my armel shows: [ 5.722800] Switching to clocksource orion_clocksource A KVM guest shows: [ 0.392136] Switched to clocksource kvm-clock Kurt _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
