Function amd64_timer::ticks_modern

pub fn ticks_modern() -> u64

The standard ticks and ticks_amd use the rdtsc instruction which as it maybe reordered in respect to other instructions the functions will contain memory fences to attempt to insure relative order. But in some highly sensative benchmarks this may introduce memory overhead, as you enforce cache consistency.

Please see these docs on the rdtscp instruction.

Be aware that this instruction maybe masked by the OS, or Hypervisor.