"lscpu" info
elff
Status: New User - Welcome
Joined: 21 Dec 2016
Posts: 1
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Hello!
I'am Debian user. On default kernel, lspcu output:
:: Code ::

# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    2
Core(s) per socket:    2
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Model name:            Intel(R) Core(TM) i5-4200H CPU @ 2.80GHz
Stepping:              3
CPU MHz:               800.000
CPU max MHz:           3400.0000
CPU min MHz:           800.0000
BogoMIPS:              5587.07
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              3072K
NUMA node0 CPU(s):     0-3
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 sst tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi

on liquorix kernel, value of "CPU max MHz" == default == 2800.

I think, you did not activate kernel options of Intel P-States...
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damentz
Status: Assistant
Joined: 09 Sep 2008
Posts: 760
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Hi eiff,

I disabled the intel p-state module a few versions ago when Phoronix revealed unpredictable performance over ondemand. It can be faster, it can be slower, but when it's slower, it can be really bad.

I'm interested in turning it back on, but I'm waiting for more benchmarks to verify that it's consistently as good or better than ondemand. There's also schedutil in development and already in mainline. It looks very promising but it's also consistently about 5% or so slower than ondemand, but has potential for much higher power savings.

On the other hand, you can see what frequency you're really running by i7z or turbostat (whatever your distribution has). From what I understand, if you're running at the highest frequency with ondemand, turbo kicks in and you can see the real frequency you're running at through these two utilities. At least on my personal / work machines, I'm consistently in turbo when under full load.

Hope that clears things up for you.
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