Grub -> 2 kernel choices in one install?

Ric95

I'm having fun thrashing my computer:: I'm sure it now hates me :wink:

I used genkernel to compile a kernel with some mild optimizations (AMD64 march=native) and I want to rename the kernal and install it in /boot beside the generic kernel. Then enter the option in menu.lst or grub.conf.

What problems would this cause?
Will apps compiled with the optimized kernel still run on the generic kernel?

alex.blackbit · Advocate Joined: 26 Jul 2005 Posts: 2397

there are only a few packages that are built directly against the kernel and do only work on one particular image, like virtualbox-modules, vmware-modules, kqemu.
emerge -p @module-rebuild (needs portage-2.2) and module-rebuild help you out here.

NeddySeagoon · Posted: Sun Feb 22, 2009 11:22 pm Post subject:

Ric95,

This is best done with kernels that have different names as shown by uname -r.
This ensures their modules are kept apart, since modules go in /lib/modules/`uname -r`/...

If you want to use the same kernel version for several kernels like this, make a copy of the entire tree then edit the Makefile.
At the top you will find

Gef · Apprentice Joined: 17 May 2008 Posts: 180 Location: France

NeddySeagoon · Posted: Mon Feb 23, 2009 12:03 am Post subject:

Gef,

That didn't used to work if you had out of kernel modules because they didin't all check it.
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NeddySeagoon

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Ric95 · Posted: Mon Feb 23, 2009 12:32 am Post subject:

Thanks guys. I'm sure learning a lot today. ( eg: what the hard way was like...)
I'll build on that and try it this way with a fresh install.