On Thu, Oct 24, 2013 at 10:10 AM, Gene Heskett <[email protected]> wrote:
> <...>
> Hyperthreading needs to be off, as evidenced by the demsg output only
> listing 2 cores, not 4, and the "linux" line in his /boot/grub/grub.cfg
> entry needs to read:
>
> menuentry 'Ubuntu, with Linux 2.6.32-122-rtai' --class ubuntu --class
> gnu-linux --class gnu --class os {
> recordfail
> insmod ext2
> set root='(hd0,1)'
> search --no-floppy --fs-uuid --set
> 06cb5bee-dd7e-42be-a4b6-d42fbdf5ce0c
> linux /boot/vmlinuz-2.6.32-122-rtai
> root=UUID=06cb5bee-dd7e-42be-a4b6-d42fbdf5ce0c ro quiet splash isolcpus=1
> initrd /boot/initrd.img-2.6.32-122-rtai
> }
>
> Note the isolcpus=1 on the end of the 'linux' line, it has to be hand
> edited into that file after the installation is done, and then rebooted
> again to enable it. The UUID's should be different from the above.
>
>
It's generally a bad idea to hand-edit the grub.cfg file. It even says why
at the top just after the "DO NOT EDIT THIS FILE" comment.
I posted a page to the Wiki two years ago (
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2)
about my solution to the problem.
Regards,
Kent
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