Commit ID: 60675225ebeecea248035fd3a0efc82ae9038a98 https://git.kernel.org/pub/scm/linux/kernel/git/next/linux- next.git/commit/drivers/cpufreq/intel_pstate.c?h=next-20230303&id=60675225ebeecea248035fd3a0efc82ae9038a98
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2008519 Title: cpufreq: intel_pstate: Update Balance performance EPP for Sapphire Rapids Status in intel: Fix Released Status in linux package in Ubuntu: Incomplete Bug description: [Feature Description] Ubuntu uses powersave governor as the default.While the powersave governor has much lower power, the performance is lower than +25% for several workloads compared to performance governor. Report is published: www.Phoronix.com showing difference of 37% The goal here is to keep mean performance delta of powersave governor from performance governor around 10% to 12% by running wide variety of server workloads. For some bursty workload, this delta can be still large, as ramp up of frequency will still lag with powersave governor irrespective of EPP setting. The performance governor always requests maximum frequency. Based on experiments, EPP of 0x00, 0x10, 0x20, the performance delta for powersave governor is around 12%. But the EPP 0x20 has 18% lower average power. Also experiments are done by raising intel_pstate sysfs min_perf_pct as high as 50%. This didn't bring in any additional improvements compared to just changing EPP. Target Kernel: 6.3 Target Release: 22.04 (5.15 kernel) [HW/SW Information] Sapphire Rapids [Business Justification] Performance Improvements Upstream: Merged 6.3 Commit ID: To be added To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/2008519/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
