cpufreq: intel_pstate: Limit the scope of HWP dynamic boost platforms
Dynamic boosting of HWP performance on IO wake showed significant improvement to IO workloads. This series was intended for Skylake Xeon platforms only and feature was enabled by default based on CPU model number. But some Xeon platforms reused the Skylake desktop CPU model number. This caused some undesirable side effects to some graphics workloads. Since they are heavily IO bound, the increase in CPU performance decreased the power available for GPU to do its computing and hence decrease in graphics benchmark performance. For example on a Skylake desktop, GpuTest benchmark showed average FPS reduction from 529 to 506. This change makes sure that HWP boost feature is only enabled for Skylake server platforms by using ACPI FADT preferred PM Profile. If some desktop users wants to get benefit of boost, they can still enable boost from intel_pstate sysfs attribute "hwp_dynamic_boost". Fixes: 41ab43c9 (cpufreq: intel_pstate: enable boost for Skylake Xeon) Link: https://bugs.freedesktop.org/show_bug.cgi?id=107410Reported-by: NEero Tamminen <eero.t.tamminen@intel.com> Signed-off-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: NFrancisco Jerez <currojerez@riseup.net> Acked-by: NMel Gorman <mgorman@techsingularity.net> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Showing
想要评论请 注册 或 登录