On 11 June 2010 16:11, Steven McCoy <[email protected]> wrote: > "It takes 324 cycles per call to complete 1 million GTOD calls without > RDTSCP and 221 cycles per call with the capability." > > > Compare this with HPET which I clock about 500ns when using mmap(), it would be significantly slower when using libc IO to read from the device.
WIthout RDTSCP or HPET you can use CPUID+RDTSC or complicated tracking of current cores and TSC offsets, etc, which is absolutely broken on hyperthreading processors. -- Steve-o
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