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Old 03-13-2016, 07:50 PM   #1
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linux kernel 4.4.4 and up - almost no all core boost

As I see from kernel 4.4.4 and up there is new scaling for processor - now the boost is much lower and limited to maybe 30 seconds. Before my cpu worked at most time loaded at 3GHz, now is somewhere 2.5GHz at load(kernel compilation). That is really annoying, as for 2 years it was working faster. About CPU
model name : Intel(R) Core(TM) i7-4710HQ CPU @ 2.50GHz
I know that this is by intel specification, but it is crappy to to cripple old cpu after release of new generation(as I know intel are driving p state driver in kernel project). I have no thermal throttle as I see from the sysfs. My question is how can be used old scaling(or to be able to use same boost again) with new kernels(source modification, maybe some insertion in sysfs or some other tweak)?
Old 03-13-2016, 08:11 PM   #2
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This is 2.5 GHz CPU, isn't it supposed to go to turbo mode only when all cores are not loaded?
Old 03-14-2016, 02:17 AM   #3
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This is somehow true. But it was running 2 years a higher frequency even when it was fully loaded, even now I am booting from older kernel(4.4.3) on my fedora and it is still somewhere 3GHz. If it was real issue it should be fixed 2 years ago. Now it is more like cripple the old cpu-s, when the new (6xxx) cpu-s are on the market.


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