3 ms·

Why is the rtt measured here on canon lake so asymmetric? I would have expected symmetry along the leading diagonal.

• jeffbee 3y ago
  And why is core 0 magical on that machine?
  • jcranmer 3y ago
    IIRC, core 0 is the one that tends to service processor interrupts, which may mean that the data is unusually noisy in a way that tends to underestimate the RTT latency time.
    • jeffbee 3y ago
      There’s a similar weird artifact at index 64.
      • innocenat 3y ago
        Core 64 is the hyper-threaded pair of core 0.
        • jeffbee 3y ago
          Not on that machine. That would only be true on a 128-thread system, but this one has 96 threads.
• yvdriess 3y ago
  Speculation, but could it be because of a ring topology?