Tag: kernel

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?

Linux 5.14 Mainline Should Work With The Raspberry Pi 400 – Phoronix

With the DeviceTree addition for the Raspberry Pi 400. No kernel driver changes were needed since it’s basically very close to the Raspberry Pi 4 but the updated DTS configuration is needed for the 1.8GHz clock rate, a different WiFi chip, power off handling via GPIO, and no ACT LED on the 400 model.

Source: Linux 5.14 Mainline Should Work With The Raspberry Pi 400 – Phoronix