Overclocking CPU power limit

Related Links

• Diminuir o throtling de temperatura
• Script para ler o limite em watts do seu processador
• https://xem.github.io/minix86/manual/intel-x86-and-64-manual-vol3/o_fe12b1e2a880e0ce-499.html
• https://superuser.com/questions/459354/the-meaning-of-thermal-throttle-counters-and-package-power-limit-notifications-i
• https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763144
• http://man7.org/linux/man-pages/man4/msr.4.html
• https://stackoverflow.com/questions/784041/how-do-i-programmatically-disable-hardware-prefetching
• Baixe o datasheet da 8th e Procure por PKG_MIN_PWR
• https://github.com/erpalma/lenovo-throttling-fix
• http://manpages.ubuntu.com/manpages/xenial/man8/inteltool.8.html
• https://www.reddit.com/r/thinkpad/comments/86s0fw/45w_performance_from_15w_kaby_laker/dw7hsma/
• Como converter o valor do registrador para watts e como usar o devmen2
• https://github.com/mihic/linux-intel-undervolt
• https://blog.mthode.org/posts/2018/Jan/undervolting-your-cpu-for-fun-and-profit/
• https://gist.github.com/Mnkai/5a8edd34bd949199224b33bd90b8c3d4

Necessary softwares

$ sudo apt install -y linux-tools-common linux-tools-generic msr-tools devmem2
$ modprobe msr

Run all commands below in a root terminal sudo su

Recuperar registrador msr

xxd -p -s+1552 -l7 /dev/cpu/0/msr | dd conv=swab 2> /dev/null | rev

Olhar os limites atuais

$ turbostat
cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061 Joules, 0.000977 sec.)
cpu0: MSR_PKG_POWER_INFO: 0x00000208 (65 W TDP, RAPL 0 - 0 W, 0.000000 sec.)
cpu0: MSR_PKG_POWER_LIMIT: 0x42028a00148208 (UNlocked)
cpu0: PKG Limit #1: ENabled (65.000000 Watts, 1.000000 sec, clamp DISabled)
cpu0: PKG Limit #2: DISabled (81.250000 Watts, 0.002441* sec, clamp DISabled)
cpu0: MSR_DRAM_POWER_LIMIT: 0x00000000 (UNlocked)

Descobrindo o endereco do seu registrador

• Acesse esse link e nele baixe o SDM para o seu processador Intel® 64 and IA-32 architectures software developer’s manual combined volumes: 1, 2A, 2B, 2C, 2D, 3A, 3B, 3C, 3D, and 4
• Depois procure pela variável MSR_PKG_POWER_LIMIT e então na tabela a esquerda deverá conter o Register address

Exemplo:

MSR_PKG_POWER_LIMIT Platform Power Limit #1

rdmsr -f 14:0 0x610

MSR_PKG_POWER_LIMIT Platform Power Limit #2 (Limite de energia no modo turbo boost

rdmsr -f 46:32 0x610

Softwares necessários

Turbostat (Para pegar informacoes dos registradores, MSR, recuperar os watts que estao sendo usados agora, ghz, etc)
msr
devmem2

Monitoring clock and watts used

while [ true ]; do WATTS=$(sudo turbostat -n 1 -s PkgWatt 2>/dev/null | tail -n1); clear; echo $WATTS; cat /proc/cpuinfo | grep "MHz"; sleep 1; done

Monitoring temperature sensors

• https://askubuntu.com/questions/15832/how-do-i-get-the-cpu-temperature

$ sudo apt install -y lm-sensors
$ while [ true ]; do sensors; sleep 1; clear; done

ou

sudo cpupower frequency-info

Lendo o pedaco de um registrador

sudo rdmsr -f 46:32 0x610

Escrevendo no registrador / Mudando o limite de consumo de energia

sudo wrmsr 0x610 0x42837000148208


- Sendo que os ultimos 3 digitos sao os watts que o seu processador pode usar em outra unidade de medida
- Para converter isso para decimal

last 3 digits hex (208) in dec = 520
this 520 * 0.125 = 65 = 65 W

So I changed it to 00DD8370

hex 370 = dec 880
880 * 0.125 = 110 W

Mudanças simples

Mudar profile no OS para performance

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors 
performance powersave

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
powersave

$ echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance

PERGUNTAS DE COMO ALTERAR O TDP SEM RESPOSTA

• https://stackoverflow.com/questions/40737422/how-can-we-change-rapl-power-limits-in-haswell-cpu

Particionamento / Partitioning No Postgres Resident Evil 4 HD Commands

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