Hi,
patch in $Subject breaks my IVB laptop here. It does not go over 1.2GHz
during load like building a kernel with -j4, for example. 1.2GHz
according to cpupower in tools/power/cpupower is the lowest P-state:
# LD_LIBRARY_PATH=. ./cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.60 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.60 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
3400 MHz max turbo 4 active cores
3400 MHz max turbo 3 active cores
3400 MHz max turbo 2 active cores
3600 MHz max turbo 1 active cores
---
turbostat output during building a kernel is:
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 1194 99.70 1200 2893
0 1196 99.92 1200 2893
1 1197 99.97 1200 2893
2 1197 99.95 1200 2893
3 1185 98.95 1200 2893
I've enabled the pr_debug's in intel_pstate_init_perf_limits() and it
says:
[ 0.826111] intel_pstate: default limits 0xc 0x1d 0x24
[ 0.829252] intel_pstate: CPU0 - ACPI _PSS perf data
[ 0.830337] intel_pstate: Updated limits using _PSS 0xc 0x1d 0x24
[ 0.830356] intel_pstate: policy max_freq=3600000 Khz min_freq = 1200000 KHz
[ 0.830908] intel_pstate: default limits 0xc 0x1d 0x24
[ 0.833002] intel_pstate: CPU1 - ACPI _PSS perf data
[ 0.833339] intel_pstate: Updated limits using _PSS 0xc 0x1d 0x24
[ 0.833361] intel_pstate: policy max_freq=3600000 Khz min_freq = 1200000 KHz
[ 0.833535] intel_pstate: default limits 0xc 0x1d 0x24
[ 0.835727] intel_pstate: CPU2 - ACPI _PSS perf data
[ 0.836036] intel_pstate: Updated limits using _PSS 0xc 0x1d 0x24
[ 0.836058] intel_pstate: policy max_freq=3600000 Khz min_freq = 1200000 KHz
[ 0.836237] intel_pstate: default limits 0xc 0x1d 0x24
[ 0.838432] intel_pstate: CPU3 - ACPI _PSS perf data
[ 0.838731] intel_pstate: Updated limits using _PSS 0xc 0x1d 0x24
[ 0.838753] intel_pstate: policy max_freq=3600000 Khz min_freq = 1200000 KHz
during boot.
When I boot with "intel_pstate=no_acpi" it boosts normally to 3.4GHz and
above and turbostat says:
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 3392 99.92 3400 2895
0 3395 99.96 3400 2897
1 3390 99.88 3400 2895
2 3391 99.89 3400 2895
3 3391 99.95 3400 2893
which is what it should be saying. :)
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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