On Sat, 2006-10-21 at 11:49 +0200, Thomas Gleixner wrote: > [ 11.515305] calibrating APIC timer ... > [ 11.618612] ..... tt1-tt2 831283 > [ 11.618614] ..... mult: 35701101 > [ 11.618616] ..... calibration result: 532021 > [ 11.618619] ..... CPU clock speed is 1995.0325 MHz. > [ 11.618622] ..... host bus clock speed is 133.0021 MHz. > > That looks reasonable. It really boils down to the lapic not working > when going idle. This LAPIC business is weird. I found two boxen, where the LAPIC timer calibration is wrong by factor 1.8 and 2.3 on every third/fifth boot. Unsurprisingly one is a VAIO with a CoreDuo inside, which claims to have a 4.6GHz CPU and 390MHz bus speed occasionally. This problem seems to be independent of the "lapic stops on C2" one. I have a patch ready, which should detect both problems, but having acpi_processor as a module is painful, as we might enable the C2 states way after we decided to use the LAPIC timer and switched over to highres/dyntick mode. I need to find a way to back out from highres/dyntick mode gracefully in that case except we can agree to make the acpi_processor bits built-in only or at least make the Kconfig tristate depending on experimental. Len ? tglx - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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