On 2023-01-30 16:32:22 [-0300], Michel Macena Oliveira wrote: > Hi, Hi, … > -Kernel Frequency: 1000 HZ you could use 250 or less. It does not affect timer resolution (as in sleep() for instance) but only kernel internal timeouts. Having a smaller values ends up with less interrupts especially with CONFIG_PERIODIC. … > After I successfully installed the preempt RT kernel, I rebooted and > tried to boot > the RT Linux, but the system returned "Out of memory. Press any key to > continue..." This appears to come from grub. Later in the thread you stated the initrd was 700MiB in size. I would have assumed that grub can handle < 1GiB but maybe not. There is a difference in the boot protocol which means EFI might be able to do more. > Finally, how can I remove a preempt RT kernel installation? if you did not package it and installed via "make install" it should be safe to just rm the kernel + config + initrd from /boot, run update-grub and then remove the modules from /lib/modules. Sebastian
