On Wed, 8 Mar 2000, Boris Okun wrote:
>This patch allows to use do_fast_gettimeofday() (and
>do_slow_gettimeofday as well) on SMP machines with processors running
>at different speeds.[..]
The timer irq could keep running on the same CPU with irq disabled for
more than the rtdsc lower 32bits wrap around. Thus the per-cpu rdtsc info
has to be 64bit wide in your case (in the current 2.2.x code it doesn't
need that because it's _not_ a per-cpu info because we rely on the TSCs to
be in sync).
Andrea
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