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In the current implementation, the response latency between seeing SCHED_CPUFREQ_IOWAIT set and the actual P-state adjustment can be up to 10ms. It can be reduced by bumping up the P-state to the max at the time SCHED_CPUFREQ_IOWAIT is passed to intel_pstate_update_util(). With this change, the IO performance improves significantly. For a simple "grep -r . linux" (Here linux is the kernel source folder) with caches dropped every time on a Broadwell Xeon workstation with per-core P-states, the user and system time is shorter by as much as 30% - 40%. The same performance difference was not observed on clients that don't support per-core P-state. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Changelog ] 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.