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The CPU ticks at a rate in the "bus clock" domain. eg. 100 MHz * bus_ratio. On newer processors, the TSC has been moved out of this BCLK domain and into a separate crystal-clock domain. While the TSC ticks "close to" the base frequency, those that look closely at the numbers will notice small errors in calculations that mix units of TSC clocks and bus clocks. "tsc_tweak" was introduced to address the most visible mixing -- the %Busy and the the Busy_MHz calculations. (A simplification as since removed TSC from the BusyMHz calculation) Here we apply the tsc_tweak to everyplace where BCLK and TSC units are mixed. The results is that on a system which is 100% idle, the sum of the C-states are now much more likely to be closer to 100%. Reported-by: Travis Downs <travis.downs@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.