[LAD] setting a runlevel at the boot prompt?

Ray Rashif schivmeister at gmail.com
Tue Feb 2 07:42:16 UTC 2010

2010/2/2 Jörn Nettingsmeier <nettings at folkwang-hochschule.de>:
> hi everyone!
> here's a question for sysadmin type low-latency adepts:
> i have a general-purpose notebook that doubles as a lean and mean
> recording machine. it's opensuse, which means it works nicely with most
> bells and whistles, but it also has an awful lot of questionable stuff
> running that interferes with stable low-latency performance.
> so i usually boot into a ll kernel and kill everything i don't need for
> the duration of a session.
> to ease that job, i have put the (unused) runlevel 4 back to work:
> basically i copied rc5.d into rc4.d and ruthlessly deleted everything i
> don't want. now "sudo telinit 4" will slim down my process list.
> since the runlevel corresponds with the need for a ll kernel, i wonder:
> is there any way to tell the kernel (via grub) to tell init to ignore
> the initdefault in /etc/inittab and go directly to runlevel $FOO?
> and while we're there, doing a kexec instead of a warm reboot would be
> so sexy - has anyone played with that yet?

Yep, append the runlevel number.

Yep, it's faster. But it's a little troublesome and I was always wary,
because I had to adapt my system's shutdown script to tag along with


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