isolcpu line: where to locate it ?
I'm running LinuxCNC 2.5.1 on Ubuntu 8.04 with a dual core cpu.
I would like to know where I should insert the line isolcpu=1 into the grub boot file .
Regards
bigalex
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John
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I follow also the instruction in the LinuxCNC wiki HERE .
My question is where is this ?For computers using classic GRUB as the boot manager, this is accomplished by editing the file /boot/grub/menu.lst to include the boot parameter "isolcpus=1" (for example) at the end of appropriate kernel lines.
.....at the end of appropriate kernel lines.
bigalex
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For computers using classic GRUB as the boot manager, this is accomplished by editing the file /boot/grub/menu.lst to include the boot parameter "isolcpus=1" (for example) at the end of appropriate kernel lines.
That's a big help! I'm assuming that it goes after everything else... can you attach the file? I don't have 8.04 running anywhere.
John
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I can't attach any file.
I send to you the file content :
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10
## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu
# Pretty colours
#color cyan/blue white/blue
## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret
#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#
#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=4473c932-391f-4ae4-a782-857cff4c2d80 ro
## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0
## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,4)
## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true
## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false
## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash
## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=
## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0
## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all
## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true
## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false
## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false
## ## End Default Options ##
title Ubuntu 8.04.2, kernel 2.6.24-16-rtai
root (hd0,4)
kernel /boot/vmlinuz-2.6.24-16-rtai root=UUID=4473c932-391f-4ae4-a782-857cff4c2d80 ro quiet splash
initrd /boot/initrd.img-2.6.24-16-rtai
quiet
title Ubuntu 8.04.2, kernel 2.6.24-16-rtai (recovery mode)
root (hd0,4)
kernel /boot/vmlinuz-2.6.24-16-rtai root=UUID=4473c932-391f-4ae4-a782-857cff4c2d80 ro single
initrd /boot/initrd.img-2.6.24-16-rtai
title Ubuntu 8.04.2, memtest86+
root (hd0,4)
kernel /boot/memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Windows NT/2000/XP
root (hd0,0)
savedefault
makeactive
chainloader +1
bigalex
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John
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It is a kernel parameter, so you add it to the kernel boot line.
The example below isolates CPU1 and puts all the load on CPU0
title EMC2 - rtai kernel isolcpu noirq Ubuntu 10.04 (on /dev/sdb7)
uuid 42d5e8ad-507d-41ea-8ad6-868e87be2ed6
kernel /boot/vmlinuz-2.6.32-122-rtai root=UUID=42d5e8ad-507d-41ea-8ad6-868e87be2ed6 ro isolcpus=1
initrd /boot/initrd.img-2.6.32-122-rtai
quiet
regards
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I will try in few minutes.
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John
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Do you add it to both kernel lines?
Just the one which starts 'kernel'.
(EDIT: OK I see what you mean now - there is no point putting on the kernel line for the recovery option, you won't be running Linuxcnc from that )
The kernel parameters at the end usually just consist of something like ro quiet splash
If you change that to ro single you will get a single user system with a root shell, very useful for getting out of trouble.
There can be lots of kernel parameters eg
ro isolcpus=1,2,3 acpi_irq_nobalance noirqbalance which was from playing about with preventing interrupts from being spread across the CPUs when just using CPU0
This is a mind blowing list
www.kernel.org/doc/Documentation/kernel-parameters.txt
regards
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