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undocumented kernel boot parameter?


undocumented kernel boot parameter?

By : Gordan
Date : November 22 2020, 10:40 AM
With these it helps The kernel doesn't. The string cryptopts does not appear anywhere in the Linux kernel.
However, the contents of the kernel command line are exposed to userspace in /proc/cmdline. Many distributions will read boot options from the command line — for instance, Debian and Ubuntu use quiet to suppress status messages at boot time. It's likely that cryptopts is used similarly.
code :


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What is Kernel boot quiet mode parameter?

What is Kernel boot quiet mode parameter?


By : Paulo Silva
Date : March 29 2020, 07:55 AM
should help you out If you are referring to a kernel boot parameter of quiet, then that is to disable most log messages.
Linux kernel boot parameters.
How to load kernel module after providing invalid parameter at boot?

How to load kernel module after providing invalid parameter at boot?


By : CuriousDan
Date : March 29 2020, 07:55 AM
will be helpful for those in need As Peter L. stated it seems that insmod can be used to avoid the kernel forcing any parameters.
kernel boot messages are not seen after removing quiet boot parameter

kernel boot messages are not seen after removing quiet boot parameter


By : Dallin Wright
Date : March 29 2020, 07:55 AM
seems to work fine You need to remove loglevel=0 option from the bootargs. This option will only print emergency messages during kernel boot. Try with some other loglevels (0-7) for print options.
Loglevel 0 : KERN_EMERG | "0" | Emergency messages, system is about to crash or is unstable | pr_emerg
nr_cpus boot parameter in Linux kernel

nr_cpus boot parameter in Linux kernel


By : Akash Kumar
Date : March 29 2020, 07:55 AM
hop of those help? I was browsing Linux kernel code to understand the nr_cpus boot parameter. As per the documentation, (https://www.kernel.org/doc/Documentation/kernel-parameters.txt) , As part of documentation describes from your question:
Specify CPU frequency as a kernel CMD_LINE parameter of Linux on boot?

Specify CPU frequency as a kernel CMD_LINE parameter of Linux on boot?


By : iMpetus
Date : March 29 2020, 07:55 AM
With these it helps I replaced my i5 CPU of my laptop with a i7 CPU, so that it can run faster. But because that the power of i7 is more, and the temperature is also higher than before, my laptop crashed frequently. So, I used cpupower to specify the MAX frequency of CPU, it works. Now, my question is "Is there a way to specify the CPU frequency as a cmd_line parameter of the linux kernel, at boot time?", so I can ensure that the system has booted stably and correctly. ,
UPDATE - 2018-11-25
code :
echo "1" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
echo "70" | sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct (70 can be changed by another percentage if clock speed and turbo speed is higher numbers. 70-80 should be enough to not reaching above 2.5 GHz)
intel_pstate=per_cpu_perf_limits
echo -n 2457600 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo -n 2457600 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq
echo -n 2457600 > /sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq
echo -n 2457600 > /sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq
sudo /usr/sbin/update-rc.d ondemand disable
sudo vi /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable"
modprobe acpi-cpufreq

sudo update-grub
cat /proc/cmdline
sudo update-rc.d ondemand disable (This command prevents above commands to be reset after reboot)

sudo apt install cpufrequtils (To control the CPU frequency scaling deamon)

echo 'GOVERNOR="userspace"' | sudo tee /etc/default/cpufrequtils
MAX_SPEED="2457600"
MIN_SPEED="1536000"
ENABLE="true"
GOVERNOR="ondemand" (or userspace)
sudo apt install tlp
cpufreq-info
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