Bill.Holler at Sun.COM wrote: > Li, Aubrey wrote: >> Bill Holler wrote: >> >> >>>>> You can probably take it from another CPU that's not in deep-c >>>>> state (if there is one?) >>>>> >>>>> >>>>> >>>>> >>>> Yes. Our initial thoughts are to sync up with a running CPU >>>> via cross call. We need to run performance experiments with >>>> different implementations to see what the costs are. >>>> >>>> >>> Synching TSC/APIC with a running cpu is potentially much more >>> accurate than using the HPET. However this will induce drift. >>> >>> >> if all the cpus are in the deeper c-state,...? >> > An external source such as the HPET or platform pm timer needs to > be used if all cpus are in deeper c-state. :-) >
Are you working on the ACPI timer driver as well? Thanks, -Aubrey
