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SubjectRe: Emulate RDTSC

On Tue, 29 May 2001, Jaswinder Singh wrote:

> What is the nice way (in accuracy and performance) to emulate RDTSC in
> Linux for those architectures who dont support RDTSC like in Hitachi
> SH Processors.

if the hardware provides no way to get some accurate estimation of current
time, then there is no way to solve this problem in a generic way.
Typically there are some cycle-accuracy counters in the CPU (ideal
situation), or sometimes there is a counter in some external device (eg.
the i8254 timer counter), but access to these tend to be slow and
typically they are quite coarse as well.

Ingo

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