Re: Selecting the scheduler from boot menu

From: Steve Kargl <kargls_at_comcast.net>
Date: Sat, 31 Jan 2026 20:39:07 UTC 
On 1/31/26 12:25, Minsoo Choo wrote:
> On Saturday, January 31st, 2026 at 3:22 PM, Steve Kargl <kargls@comcast.net> wrote:
> 
>>
>>
>> All,
>>
>> Is it possible modify the boot menu to select 4BSD or ULE
>> during the boot process? I've looked at the code in
>> src/stand/forth, but unfortunately the language is foreign
>> to me. Currently, one boots into FreeBSD, checks the
>> kern.sched.name, and then may need to edit /boot/loader.conf
>> to change to the other scheduler, and then reboot.
>>
>> --
>> steve
> 
> You can use `set variable_name="value"` in the loader prompt. To enter boot console, select "3. Escape to loader prompt" on boot screen.
> 

Yes, of course, dropping to the loader prompt is possible.
However, after an extended uptime, one might forget to do
so; whereas the boot menu will jog the memory.  For example,
if ULE is the default, then

4. kernel with 4BSD scheduler

is a clear hint to choose the alternate loader.

-- 
steve