BFS vs. mainline scheduler benchmarks and measurements

I also have some strange behaviour on a no-name dual core all intel portable PC, kind of 2-4 seconds where mouse is not even moving, without any load whatsoever, no log in /var/log/messages, completely random.
This portable PC is cheap and "designed for the other OS" system even if it was sold without anything installed: the DMI information is blank, the ACPI information does not seem to be better.
I tend to think that it is a SMM problem, instead of a scheduler problem, the crappy BIOS (cannot update because no DMI name) does not like Linux, or was explicitely designed to give a bad experience. I would really like to be wrong here.
There was a time when Linux did not rely on any BIOS, but it is no more (SMM cannot be disabled, even under Linux - what is what is handling the forced power off by pressing On/Off button for more than 3 seconds).