Why does my multiprocessor or hyperthreaded CPU system appear to be running a uniprocessor kernel instead of an SMP one after a system update?

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You can check whether your system is using an SMP (symmetric multiprocessor) or UP (uniprocessor) kernel by issuing the command cat /proc/cpuinfo. If you are running an SMP kernel then you should receive information on multiple CPUs if your system has multiple CPUs or a hyperthreaded CPU.

A common cause of installation of a UP kernel in place of an SMP one is mistakenly usi...

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