Here are some results without changing frequencies on a system whose
BIOS does not support Power Now! on MP systems:
Basically the system booted up with "nohpet, nopmtimer"i.e. using TSC as
the GTOD time source and system stayed idle for 13 hours. There
appears to be drift of 20 secs in the CPU 2 readings. This TSC drift
will be worse when
the system is active and doing GTOD operations.
CPU 2: Syncing TSC to CPU 0.
CPU 2: synchronized TSC with CPU 0 (last diff -108 cycles, maxerr 826
cycles)
CPU 3: Syncing TSC to CPU 0.
CPU 3: synchronized TSC with CPU 0 (last diff -119 cycles, maxerr 845
cycles)
*** CPUs go offline ***
*** back online ***
CPU 2: Syncing TSC to CPU 0.
CPU 2: synchronized TSC with CPU 0 (last diff -117 cycles, maxerr 846
cycles)
CPU 3: Syncing TSC to CPU 0.
CPU 3: synchronized TSC with CPU 0 (last diff -117 cycles, maxerr 845
cycles)
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