Improving performance/Boot process
Improving the boot performance of a system can provide reduced boot wait times and a means to learn more about how certain system files and scripts interact with one another. This article attempts to aggregate methods on how to improve the boot performance of an Arch Linux system.
Modifying boot files
The initscripts can be started asynchronously instead of running in a strict order.
# use once instead of wait rc::sysinit:/etc/rc.sysinit rs:S1:wait:/etc/rc.single rm:2345:once:/etc/rc.multi rh:06:once:/etc/rc.shutdown su:S:once:/sbin/sulogin -p
TTY terminal management
agetty is Arch Linux's default terminal manager. By default it will generate six terminals, which can be accessed by typing Template:Keypress. To increase performance you can comment out unused terminals. It is important to not comment out the first two terminals (i.e.
c1:2345:respawn:/sbin/agetty -8 38400 tty1 linux c2:2345:respawn:/sbin/agetty -8 38400 tty2 linux #c3:2345:respawn:/sbin/agetty -8 38400 tty3 linux #c4:2345:respawn:/sbin/agetty -8 38400 tty4 linux #c5:2345:respawn:/sbin/agetty -8 38400 tty5 linux #c6:2345:respawn:/sbin/agetty -8 38400 tty6 linux
Additionally, consider using a lighter terminal manager such asAUR, which consists of the minimal tty manager, , that has been stripped of printfs and compiled against .
fgetty on the following lines:
c1:2345:respawn:/sbin/fgetty tty1 linux c2:2345:respawn:/sbin/fgetty tty2 linux
This file lets you modify the kernel command line at boot. A couple of ways to speed up boot time using this file to modify the kernel command line is to remove framebuffer entries and to set the kernel to use a low level of logging with
quiet. For more kernel parameters and
/boot/grub/menu.lst examples check out the page on GRUB. Remove existing
vga= framebuffer resolution entries and
logo.nologo, parameters to the desired kernel:
kernel /vmlinuz-linux root=/dev/disk/by-uuid/UUID ro logo.nologo quiet
In the network section, make sure you only load the network interface you need. Manually configuring your network with a static IP address is also faster than using DHCP.
Then find and remove all DAEMONS that you do not need.
DAEMONS=(alsa network gdm)
Next, move your login manager (in this case) to the front, and background all DAEMONS.
DAEMONS=(@gdm @alsa @network)
Another thing you could do about daemons is finding the best, or rather, "sweetest" arrangement.
DAEMONS=(syslog-ng @acpid arptables iptables network pdnsd @alsa @dbus @mpd @crond @sensors @ntpd @dropboxd)
You should try to background as many DAEMONS as possible, making sure to start dependent DAEMONS after what they require (in the above example,
pdnsd depends on
dropboxd depend on
network, because 127.0.0.1 is the DNS server). You can still background daemons that are required by other things (
dbus is required by Xorg), but they need enough time to start (it can take some experimentation to get it all to work well).
This script is responsible for the majority of output you see during boot, meaning this is a system-critical configuration file which looks up other files like
/etc/rc.conf and loads modules, sets up mounts, handles errors, and basically tries to be your best friend.
There are certain lines here which you may not need. Removing or commenting them out may save you a few seconds at most. Do this at your own risk. For example, if you do not have RAID, LVM or encryption, then you would not need any lines concerning that.
It is also possible to add some ampersands (
&) to make it more asynchronous, but be careful - lots of things are expected to be finished during later parts of the script.
Compiling a Custom Kernel
To decrease boot time, a stripped kernel is a must. Read more about compiling a kernel.