On Mon, Aug 08, 2011 at 11:18:35AM +0000, Jared D. McNeill wrote: > Module Name: src > Committed By: jmcneill > Date: Mon Aug 8 11:18:34 UTC 2011 > > Modified Files: > src/sys/arch/x86/x86: tsc.c > > Log Message: > If the USE_PLATFORM_CLOCK flag is set in the FADT, it indicates that OSPM > should use a platform provided timer (either HPET or the PM timer). A > platform may set this flag if internal processor clock(s) cannot provide > consistent monotonically non-decreasing counters. Set TSC quality to -100 > if this flag is set.
We should not really trust ACPI/FADT here. See acpicpu(4) how this is derived from the actual CPU information. Additionally, I suggested decreasing the quality of tsc(9) based on this information a long time ago, but joerg@ had concerns about this. - Jukka.
