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Performance.md

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Performance

Silent boot + boot improvements

I personally prefer a silent boot without logs, messages and warnings.

/boot/efi/loader/entries/arch.conf

  • avoid FS#32309 with vga=current (maybe no longer needed)
  • show only the most important messages from dmesg using loglevel=3 kernel option
  • avoid a possibly costly remount of the root partition by changing ro to rw on the kernel line
  • set resume partition for hibernation
options root=UUID=1b37449b-c8e6-467a-9c28-39d5e65546d1 quiet splash loglevel=3 vga=current rd.systemd.show_status=auto rd.udev.log_priority=3 vt.global_cursor_default=0

/etc/fstab

  • you can avoid a possibly costly remount of the root partition by changing ro to rw on systemdboot entry options abd removing it from /etc/fstab
  • if staggered spin-up is not used, you can disable it on boot to save time
  • replace relatime with noatime for efi e /home partitions

/etc/mkinitcpio.conf Let systemd check the root filesystem, hide fsck messages during boot (replace udev):

HOOKS=( base systemd fsck ...) 
mkinitcpio -p linux

edit systemd-fsck-root.service and systemd-fsck@.service:

systemctl edit --full systemd-fsck-root.service
systemctl edit --full systemd-fsck@.service

adding:

StandardOutput=null
StandardError=journal+console

to the [Service] block:

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/lib/systemd/systemd-fsck
StandardOutput=null
StandardError=journal+console
TimeoutSec=0

Mask lvm2-monitor service Since I don't use LVM, I mask the service to prevent it from running (1s gained at boot time):

systemctl mask lvm2-monitor

Zram (compcache)

First, enable the module, add zram in /etc/modules-load.d/zram.conf. I want 2 zram nodes, so this is my /etc/modprobe.d/zram.conf file:

options zram num_devices=2

Create udev rules in /etc/udev/rules.d/99-zram.rules:

KERNEL=="zram0", ATTR{disksize}="4GB" RUN="/usr/bin/mkswap /dev/zram0", TAG+="systemd"
KERNEL=="zram1", ATTR{disksize}="4GB" RUN="/usr/bin/mkswap /dev/zram1", TAG+="systemd"

each node is 4GB large, for a total of 8GB.

Then add zram nodes to /etc/fstab:

/dev/zram0 none swap defaults 0 0
/dev/zram1 none swap defaults 0 0