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I am sending network packets from one thread and receiving replies on a 2nd thread that runs on a different CPU core. My process measures the time between send & receive of each packet (similar to ping). I am using rdtsc for getting high-resolution, low-overhead timing, which is needed by my implementation. All measurments looks reliable. Still, I am worried about rdtsc accuracy across cores, since I've been reading some texts which implied that tsc is not synced between cores. I found the following info about TSC in wikipedia Constant TSC behavior ensures that the duration of each clock tick is uniform and supports the use of the TSC as a wall clock timer even if the processor core changes frequency . This is the architectural behavior moving forward for all Intel processors. Still I am worried about accruracy across cores, and this is my question More Info I run my process on an Intel nehalem machine. Operating System is Linux. The " constant_tsc " cpu flag is set for all the cores.
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