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Currently intel_pstate can function only in HWP mode on Skylake servers. When HWP feature is not enabled on the processor then acpi-cpufreq is driver is used. Based on the power and performance tests using intel_pstate scaling algorithm the results are comparable. But intel_pstate brings in additional features: - Display of turbo frequency range, which many users like to see - Place limits in the turbo frequency range when platform allows Since these tests are done only using non PID algorithm introduced in kernel version 4.14, this patch is not a backport candidate. So each user has to carefully weigh the benefits before he backports. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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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.