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phckopperrafaeljw
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cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids
On Intel Emerald Rapids machines, we ship the Energy Performance Preference (EPP) default for balance_performance as 128. However, during an internal investigation together with Intel, we have determined that 32 is a more suitable value. This leads to significant improvements in both performance and energy: POV-Ray: 32% faster | 12% less energy OpenSSL: 12% faster | energy within 1% Build Linux Kernel: 29% faster | 18% less energy Therefore, we should move the default EPP for balance_performance to 32. This is in line with what has already been done for Sapphire Rapids. Signed-off-by: Pedro Henrique Kopper <pedro.kopper@canonical.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://patch.msgid.link/Zqu6zjVMoiXwROBI@capivara Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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drivers/cpufreq/intel_pstate.c

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@@ -3405,6 +3405,7 @@ static const struct x86_cpu_id intel_epp_default[] = {
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*/
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X86_MATCH_VFM(INTEL_ALDERLAKE_L, HWP_SET_DEF_BALANCE_PERF_EPP(102)),
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X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
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X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
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X86_MATCH_VFM(INTEL_METEORLAKE_L, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
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179, 64, 16)),
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X86_MATCH_VFM(INTEL_ARROWLAKE, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,

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