Exemples paramètres noyau kernel Linux boot

Voir aussi :

• pb_disque_invisible_sur_hp_proliant_disque_invisible_lors_de_l_install_os_redhat7

Kernel boot parameter

cat /proc/cmdline

Voir :

• https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
• https://help.ubuntu.com/community/BootOptions

noapic nolapic acpi=off nomodeset nodmraid

edd=on

Désactiver Cloutinit

cloud-init=disabled

Désactiver la mitigations des CPU pour améliorer les performances au dépend de la sécurité Kernel 5.1.13 et sup

mitigations=off

Avant Kernel 5.1.13

/etc/default/grub

GRUB_CMDLINE_LINUX="noibrs noibpb nopti nospectre_v2 nospectre_v1 l1tf=off nospec_store_bypass_disable no_stf_barrier mds=off tsx=on tsx_async_abort=off mitigations=off"

Retbleed

spectre_v2=ibrs retbleed=off

Voir https://access.redhat.com/solutions/retbleed

pnpbios=off noapic

Désactive partiellement KPTI (Kernel page-table isolation)
KPTI a été crée pour limiter l'impact de Meltdown

noibrs noibpb nopti
#pti=off

Autres

pci=noaer
pcie_aspm=off

Source : https://www.techradar.com/how-to/computing/how-to-fix-any-linux-problem-1322630

noapic

ou

noapictimer, acpi=off

ou

acpi=force
irqpoll
pci=nommconf
pci=nomsi

splash=silent quiet showopts  nvme_core.default_ps_max_latency_us=170000 crashkernel=192M,high crashkernel=72M,low intremap=no_x2apic_optout apic=verbose lapic irqfixup irqpoll i2c_i801.disable_features=0x10 hpet=disable initcall_blacklist=dw_i2c_init_driver nvme_core.default_ps_max_latency_us=200000 iwlmvm.power_scheme=1 iwlwifi.amsdu_size=3


lapic=notscdeadline

acpi=rsdt

pci=nocrs
no_timer_check

Pb avec SSD BIOS : SATA sur AHCI à la place de RAID Ou change RAID On to Disabled (Disable : The SATA controllers are hidden).

nvme_load=YES

Source : https://www.dell.com/support/article/fr-fr/sln299303/chargement-d-ubuntu-sur-les-syst%C3%A8mes-%C3%A9quip%C3%A9s-de-disques-pcie-m2?lang=fr

loglevel=7 systemd.log_level=debug

ignore_loglevel

Affiche tous les messages Peut être changé dynamiquement

Source : http://www.gilfether.com/linux-crashes-reboots-acpi-and-apic/357/

On single processor machines you can fully disable ACPI and APIC by passing kernel boot parameters:

noapic nolapic acpi=ht

On a dual core, quad core, or multiprocessor machine, you want to make sure you enable Local APIC. Local APIC has some kind of control over your Multiprocessor machine. If you shut off Local APIC on an multi-core or multiprocessor machine, you will only see one processor available. Use the following Kernel parameters:

noapic lapic acpi=ht

Exemple Oracle

numa=off transparent_hugepage=never clocksource=tsc 

ipv6.disable=1 audit=1 audit_backlog_limit=8192 

CloneZilla

linux /live/vmlinuz boot=live union=overlay username=user config components  noswap edd=on nomodeset nodmraid noeject locales=en_US.UTF-8 keyboard-layouts=NONE ocs_live_run="ocs-live-restore" ocs_live_extra_param="-e1 auto -e2 -c -r -j2 -scr -p true restoredisk IMAGES sda sdb" ocs_live_batch=yes vga=788 ip= net.ifnames=0 quiet nosplash i915.blacklist=yes radeonhd.blacklist=yes nouveau.blacklist=yes vmwgfx.enable_fbdev=1

Autres

xdriver=vesa fastboot

UEFI

video=efifb fbcon=rotate:1

Désactive le chargement du microcode CPU

dis_ucode_ldr

Lenteur au boot à cause d'un maque d'entropie

random.trust_cpu=on

Voir https://daniel-lange.com/archives/152-hello-buster.html

Voir KVM : https://www.redhat.com/en/blog/red-hat-enterprise-linux-virtual-machines-access-random-numbers-made-easy

memmap=512M\$1024M

/etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet memmap=512M\\\$1024M"

force_latency=cstate.id:1|3
 
force_latency=1