Category: Linux

What is vm.min_free_kbytes and how to tune it?

vm.min_free_kbytes setting allows kernel to compute a minimum value in the low memmory zone and reserve it for its own use.

 

To read the current value

[Fri Mar 24 15:18:05 root@system:~]$sysctl vm.min_free_kbytes

vm.min_free_kbytes = 1888

To set new value of 4MB. Based on your system requirement configure the value. Ideally 1.8% is good enough.

echo 4096 > /proc/sys/vm/min_free_kbytes

To configure permenantly on every reboot add the below entry to /etc/sysctl.conf

vm.min_free_kbytes=4096

 

Source: What is vm.min_free_kbytes and how to tune it?

Machine Owner Key (MOK) – Understanding the UEFI Secure Boot Chain

MOK Architecture. The keys added via mokutil via any Linux OS, will be stored in the MOK database. Since its a boot service variable, it will be stored in the BIOS NVRAM. On next boot the shim layer will prompt for enrolling the key. Once enrolled the key can be used to validate the respective async drivers (not part of OS distribution) by kernel to allow installing them during OS boot or run time.

Source: Machine Owner Key (MOK) – Understanding the UEFI Secure Boot Chain

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