On Tue, 2015-11-17 at 10:09 +0100, Borislav Petkov wrote: > 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 > Is it complete log? Can you send the complete log? I don't see call to intel_pstate_set_policy() from cpufreq in this log? Are you using 4.4.rc1 or cherry picked this patch?
Thanks, Srinivas > 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. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
