There have been several questions about the virtual cpus that result from hyperthreading P4 processors. For a dual cpu system, which lists cpus 0-3, which cpu numbers correspond to which actual processor? Are cpu01 & cpu03 the virtual cpus, meaning that cpu00 & cpu01 represent the first processor and cpu02 & cpu03 represent the second processor? Or is it an even-odd split: cpu00 & cpu02, cpu01 & cpu03? Or does the physical processor id value in /proc/cpuinfo indicate which cpu number is which? I'm curious because it seems possible to mess up and set irq affinity (for dual network adapters, for example) to the same physical processor. Thanks, John R. ibiblio.org
