Usage of RDTSC
rdtsc is a VC call and implemented in assembly. It gets the current ticks of CPU.

1) header files

#include

#pragma intrinsic(__rdtsc)

#include

2) body

LARGE_INTEGER m_largeint;

QueryPerformanceFrequency(&m_largeint); //get the clock frequency of CPU in HZ

unsigned __int64 i = __rdtsc(); // get the current CPU ticks
int c = my_write_packet_to_queuepSendQueue,tLibnet); // the code you want to measure
unsigned __int64 j = __rdtsc(); // get the current CPU ticks

int m = (j - i)/m_largeint.QuadPart; // the running time in seconds