On Apr 5, 2011, at 8:45 AM, Stephen Wille Padnos wrote:
> Note that with grub2, ie Ubuntu 10.04, there is a directory of files 
> which are executed in order whenever grub is reconfigured.  It looks 
> like the output of those files is concatenated, or the config file is 
> piped from one to the next (I'm not sure of the actual mechanism).  In 
> any case, you can make a filter script like this and add it as a 
> separate executable file in /etc/default/grub/.  This is preferable to 
> editing update-grub since the changes will be preserved through updates 
> to grub.
> 
> This is all described in reasonable detail at the link I posted above, 
> <http://ubuntuforums.org/showthread.php?t=1195275>.

According to the instructions above I editted /etc/default/grub and change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1"

I then have to run "sudo update-grub" in a command line and the appropriate 
change is made.   This isn't done automatically during a reboot apparently.

This works fine, and seems to be the "approved" way of making (at least) a 
temporary change.   But if, during an update, /boot/grub/grub.cfg gets 
overwritten I would have to re-run "sudo update-grub" by hand, otherwise the 
change won't appear. 

I don't fully understand how would integrate the script for modifying the 
kernel line (from Erik's messages) into the appropriate place to make this 
change live through changes to /boot/grub/grub.cfg.
Perhaps it goes in one of the files in /etc/grub.d, but I am not sure at what 
point the line exists in order to modify it...

-Tom


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