If you have some modern Intel or AMD x86 CPU, you certainly have a multiprocessor cpu with many cores. As you can see after the default installation of OpenBSD, you have enabled the single-core kernel.
To change this setup, I recommend you to read the man page of ‘boot.conf’ (man boot.conf) to know what you have to do. However I can tell you the answer, right now:
Edit or create a file called boot.conf in /etc directory, as root:
# vi /etc/boot.conf
Add this line: set image bsd.mp
Save the file and reboot your computer. Remember, the default kernel is the most recommended for stability, compatibility of drivers and devices and so on.
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