I was doing some performance tests of system calls and I find an interesting behavior.
Using RDTSC to count the CPU cycles, a single call to the getpid() consumes about 7k of CPU clock cycles and ten calls consume approximately 9,800 cycles.
The fact is that from the second call, the CPU cycles grows at a rate of about 350 CPU cycles per call.
Why does this happen? There is some hardware optimization when the syscall ID is already in EAX register ?
Any ideias ?
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