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I updated my Ubuntu box today. Everything went smooth until I noticed that the system was slower. My 686 SMP kernel was replaced by a 386. Being used to surprises like this one with the Ubuntu updates, I downloaded and installed the lastest SMP kernel. After installation, the darn thing booted up slower than a snail… One way to fix this is to add “idle=halt” in the kernel boot options ( gedit /boot/grub/menu.lst ). This happens because of a bug in the ACPI CPU power states and affects HT processors as well as dual processor systems.

Technorati Tags: Ubuntu, SMP, Kernel, dual processor, HT

The Ubuntu Misadventures by Ricardo Saramago, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.