On Oct 13, 2006, at 11:26 AM, Eric Hodel wrote:
Or did that change recently?
It's only on certain systems, apparently.
Is there a list of systems where it is safe to use the TSC with
SMP? Or some script we can run?
The problem of the TSC clocks getting out of sync affects pretty much
all AMD X2 dual-core CPUs, as well as the older 32-bit Althon MP
CPUs; the Intel Xeon and Core Duo CPUs seem to do a lot better,
although older Intel CPUs have also been reported to show problems
with the TSC.
Disabling the fancy power-management capabilities (SpeedStep,
PowerNow, Cool-n-quiet) to prevent the system from adjusting the CPU
clock frequencies seems to reduce the extent of the problem.
However, if you want your system clock to work reliably, using the
ACPI-safe or i8254 timecounters is going to do much better than using
the faster-but-unreliable TSC method.
--
-Chuck
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