Rdtscp instructional fair

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rdtsc linux

rdtsc c++rdtsc to nanoseconds

rdtsc performance

invariant tsc

__ rdtscp ()

rdtscp inline assembly gcc

rdtscp gcc

This corresponds to hex code 0x8000000 . According to the libvirt CPU ID mapping database, this should be referring to the rdtscp feature
Your examples are misleading because RDTSCP with an invariant TSC implies that the . Fair enough 🙂 We strongly discourage using the RDTSC or RDTSCP processor instruction to directly query the TSC because you
RDTSCP instruction missing (and 64 bit problems) Okay, fair enough, then you might want to also include the DS override if it is specified. By not including DS
We use the recent Intel instruction RDTSCP, or Read Time Stamp Counter and Processor ID, to obtain the timestamps in listing 4. e RDTSCP instruction28 Feb 2015 To make this fair, we will assume that the integers all fit in a 32-bit signed On Intel x86, this is implemented with the RDTSC instruction (even
30 Mar 2017 To read the counter, you issue the rdtsc instruction. It copies the 64-bit counter . less likely to get reordered. But the other two are fair game.
25 Oct 2015 While investigating a different issue, I found myself looking again at accurate timing with the rdtsc instruction to read the processor’s Time
Opcode*, Instruction, Op/En, 64-Bit Mode, Compat/Leg Mode, Description. 0F 01 F9, RDTSCP, ZO, Valid, Valid, Read 64-bit time-stamp counter and
recent Intel processors: the invariant rdtscp instruction. rdtscp reads the processor ordering of transactions by placing a store, load, and rdtscp immediately prior to [27] O. Krieger, M. Stumm, R. Unrau, and J. Hanna, “A Fair Fast. Scalable
2 Jan 2015 The Linux kernel uses mfence;rdtsc on AMD platforms and lfence;rdtsc on Intel. . The RDTSCP instruction reads the timestamp register for the second time and

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