On Thu, May 5, 2022 at 1:34 PM David Laight <David.Laight@xxxxxxxxxx> wrote: > > ... > > + cycles_t end, start = get_cycles(); > > blake2s_update(&input_pool.hash, in, nbytes); > > + end = get_cycles(); > > If get_cycles() is rdtsc then that gives meaningless numbers. > The cpu clock frequency will change on you. > > You can use one of the performance counters to get an actual Indeed. In the process of wiring up rdpmc now. Jason
