Spectre Meltdown should be disabled in SL6.9

If SL6.9 is installed on a system, it is recommended that the following steps should be executed to disable Spectre Meltdown:

1. If CyFlex is running, then shut it down:
   $ slay_stuff

2. Make a copy of the GRUB menu interface configuration file before editing:
   $ cd /boot/grub
   $ sudo cp grub.conf grub.conf.bak

3. Edit the GRUB menu configuration to add the kernel boot options:
   $ cd /boot/grub/
   $ sudo nano grub.conf

   If more than one kernel line is in the file, locate the following line:
   kernel /vmlinuz-2.6.32-754.6.3.el6.i686 ro root=…

   At the end of the line showing the kernel version (above), add the following:
   spectre_v2=off nopti

   This is a long line and the contents of the line must be all on one line.

4. Save the file.
5. Reboot the system.

Spectre Meltdown is known to cause CPU slowdowns.