Dear kubuntu-forum!
First of all i wanna say hallo to all of you as this is my first post/question here. My name is philip and i am a student for mathematics in vienna/austria. Just a couple of sentences to tell how it came to my problem! I am working at the university to implement some new algorithms for solving partial differential equations, and to do so we have to solve quite big equation systems, so a fast computer is really essential! As we have ubuntu here on the server at the university and i really needed a new laptop i just bought a thinkpad T440s and installed kubuntu. As i am really new to linux i learn more and more every day (and i love it!) and over the weekend i just found out i should install "tlp". After that i just read over the output and got quite confused of the cpu-section:
i have an intel i7-4600U. On the official homepage of intel (as this is my first post i can't post links...) it says the cpu has 2.1Ghz up to 3.3 Ghz using boost. And thats the output of tlp:
CPU Model = Intel(R) Core(TM) i7-4600U CPU (at) 2.10GHz
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu2/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpufreq/boost = 1
/proc/sys/kernel/nmi_watchdog = 0
So first of all i was worried of the scaling_max_freq. Is this the upper-frequency without boost or including it? Because when i do some calculations and check using lscpu the maximum is always 2.1Ghz, so i think thats the upper frequency including boost... So first of all i tried puching up the frequency using cpufreq-set as there are higher frequencies available (here another question: the link above says its up to 3.3 Ghz, so why can i just pick a max of 2.7Ghz? i have the same issue using windows where it says i7-4600U (at) 2.1Ghz-2.7Ghz,... so at least i think thats no problem of kubuntu...). to bad, the cpufreq-set had no effect at all...
after a long search i came to this blog where i got a hint that the bios_limit could be the problem, and checking "/sys/devices/system/cpu/cpu0/cpufreq/bios_limit" i just got 2100000, so that's the problem! So i could do the same as in the blog (there is a instruction) to push up the scaling_max_freq to 2.7Ghz, but i am quite worried why i have to do it in such a way. Is it dangerous when i ignore the bioslimit, or is it no problem to push the upper freq to 2.7Ghz. I just don't want to destroy my new laptop...
I hope i have described my problems in the right way!
Thanks a lot,
philip
First of all i wanna say hallo to all of you as this is my first post/question here. My name is philip and i am a student for mathematics in vienna/austria. Just a couple of sentences to tell how it came to my problem! I am working at the university to implement some new algorithms for solving partial differential equations, and to do so we have to solve quite big equation systems, so a fast computer is really essential! As we have ubuntu here on the server at the university and i really needed a new laptop i just bought a thinkpad T440s and installed kubuntu. As i am really new to linux i learn more and more every day (and i love it!) and over the weekend i just found out i should install "tlp". After that i just read over the output and got quite confused of the cpu-section:
i have an intel i7-4600U. On the official homepage of intel (as this is my first post i can't post links...) it says the cpu has 2.1Ghz up to 3.3 Ghz using boost. And thats the output of tlp:
CPU Model = Intel(R) Core(TM) i7-4600U CPU (at) 2.10GHz
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu1/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu2/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu2/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu2/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver = acpi-cpufreq
/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor = ondemand
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq = 756000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq = 2100000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_available_frequencies = 2701000 2700000 2600000 2400000 2300000 2100000 2000000 1800000 1700000 1600000 1400000 1300000 1100000 1000000 800000 756000 [kHz]
/sys/devices/system/cpu/cpufreq/boost = 1
/proc/sys/kernel/nmi_watchdog = 0
So first of all i was worried of the scaling_max_freq. Is this the upper-frequency without boost or including it? Because when i do some calculations and check using lscpu the maximum is always 2.1Ghz, so i think thats the upper frequency including boost... So first of all i tried puching up the frequency using cpufreq-set as there are higher frequencies available (here another question: the link above says its up to 3.3 Ghz, so why can i just pick a max of 2.7Ghz? i have the same issue using windows where it says i7-4600U (at) 2.1Ghz-2.7Ghz,... so at least i think thats no problem of kubuntu...). to bad, the cpufreq-set had no effect at all...
after a long search i came to this blog where i got a hint that the bios_limit could be the problem, and checking "/sys/devices/system/cpu/cpu0/cpufreq/bios_limit" i just got 2100000, so that's the problem! So i could do the same as in the blog (there is a instruction) to push up the scaling_max_freq to 2.7Ghz, but i am quite worried why i have to do it in such a way. Is it dangerous when i ignore the bioslimit, or is it no problem to push the upper freq to 2.7Ghz. I just don't want to destroy my new laptop...I hope i have described my problems in the right way!
Thanks a lot,
philip
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