cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids
Subsystems (2)
PATCH 1/1 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.
--- drivers/cpufreq/intel_pstate.c | 1 + 1 file changed, 1 insertion(+)
drivers/cpufreq/intel_pstate.c +1 -0
@@ -3405,6 +3405,7 @@ static const struct x86_cpu_id intel_epp_default[] = {*/ X86_MATCH_VFM (INTEL_ALDERLAKE_L ,HWP_SET_DEF_BALANCE_PERF_EPP (102 )),X86_MATCH_VFM (INTEL_SAPPHIRERAPIDS_X ,HWP_SET_DEF_BALANCE_PERF_EPP (32 )), +X86_MATCH_VFM (INTEL_EMERALDRAPIDS_X ,HWP_SET_DEF_BALANCE_PERF_EPP (32 )),X86_MATCH_VFM (INTEL_METEORLAKE_L ,HWP_SET_EPP_VALUES (HWP_EPP_POWERSAVE ,179 ,64 ,16 )), X86_MATCH_VFM(INTEL_ARROWLAKE, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
Signature · 1 line
2.43.0
Quoted 14 lines · Pedro Henrique Kopper
On Intel Emerald Rapids machines, we ship the Energy Performance Preference
(EPP) default forbalance_performanceas 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
Quoted 5 lines
Therefore, we should move the default EPP for
balance_performanceto 32.
This is in line with what has already been done for Sapphire Rapids.Signed-off-by Pedro Henrique Kopper <[email protected]>
Quoted 23 lines
---
drivers/cpufreq/intel_pstate.c | 1 +1 file changed, 1 insertion(+)drivers/cpufreq/intel_pstate.c +1
-0@@ -3405,6 +3405,7 @@ static const struct x86_cpu_idintel_epp_default[] = { */ X86_MATCH_VFM(INTEL_ALDERLAKE_L,HWP_SET_DEF_BALANCE_PERF_EPP (102 )), X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X,HWP_SET_DEF_BALANCE_PERF_EPP (32 )), + X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X,
HWP_SET_DEF_BALANCE_PERF_EPP(32)),
X86_MATCH_VFM(INTEL_METEORLAKE_L,
HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
179, 64, 16)),
X86_MATCH_VFM(INTEL_ARROWLAKE,
HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
Quoted 16 lines · srinivas pandruvada
Quoted 14 lines · Pedro Henrique Kopper
On Intel Emerald Rapids machines, we ship the Energy Performance Preference
(EPP) default forbalance_performanceas 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
Quoted 6 lines
Quoted 5 lines
Therefore, we should move the default EPP for
balance_performanceto 32.
This is in line with what has already been done for Sapphire Rapids.Signed-off-by Pedro Henrique Kopper <[email protected]>
Applied as 6.11-rc material.
If I'm able to send a pull request next week, I'll push this for -rc3. Otherwise, it'll be -rc4.
Quoted 25 lines
Quoted 23 lines
--- drivers/cpufreq/intel_pstate.c | 1 + 1 file changed, 1 insertion(+)drivers/cpufreq/intel_pstate.c +1
-0@@ -3405,6 +3405,7 @@ static const struct x86_cpu_idintel_epp_default[] = { */ X86_MATCH_VFM (INTEL_ALDERLAKE_L ,HWP_SET_DEF_BALANCE_PERF_EPP (102 )),X86_MATCH_VFM (INTEL_SAPPHIRERAPIDS_X ,HWP_SET_DEF_BALANCE_PERF_EPP (32 )), + X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X,
HWP_SET_DEF_BALANCE_PERF_EPP(32)),
X86_MATCH_VFM(INTEL_METEORLAKE_L,
HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,179, 64, 16)), X86_MATCH_VFM(INTEL_ARROWLAKE,HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,