虚拟机下的LINUX运行时总显示i8253 count too high!,为什么？

The i8253 chip is part of the timing mechanism inside of a computer -
now - it happens that inside of virtual machines (and on a number of
physical laptops) time will go backwards by small amounts every now and
then. Most operating systems have code to support such perturbations -
including Linux. But for some reason in kernels 2.4.20 and later - they
decided to print out a debug message whenever this happens. This has
caused a lot of confusion for laptop users - but this message can be
ignored.

The solution it seems is to append the following boot options: acpi=off noapic to the kernel command line. At least after appending these the error messages have stopped appearing but they may pop up at a later date.

参考
http://www.linuxquestions.org/questions/slackware-14/i8253-count-t