##查看
#CentOS版本
cat /etc/redhat-release
#linux内核版本
uname -r
#查看内存信息 Size Speed "Configured Clock Speed"
dmidecode -t memory | grep Size
dmidecode -t memory | grep Speed
dmidecode -t memory | grep "Configured Clock Speed"
#查看cpu
lscpu
#查看pci
lspci
#查看结构树
lsblk

#关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
#关闭SELinux
vi /etc/selinux/config
SELINUX=disable
:wq
reboot
#临时关闭SELinux重启恢复 
getenforce
Enforcing
sudo setenforce 0
getenforce
Permissive


#超线程的打开和关闭
sudo bash -c "echo on > /sys/devices/system/cpu/smt/control"
sudo bash -c "echo off > /sys/devices/system/cpu/smt/control"
#提升电源功率
cpupower idle-set -D 0
cpupower idle-info
#设置cpu性能模式
cat /proc/cpuinfo | grep MHz
cpupower frequency-info
cpupower frequency-set -r -g performance

for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu*/cpufreg/scaling available governors
#更改grub.cfg
vi /etc/default/grub
intel_pstate=disable
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
grub2-mkconfig -o /boot/grub2/grub.cfg
##io调优
modprobe kvm-intel
modprobe vhost-vsock
BOOT_IMAGE= * amd_iommu=on iommu=pt mitigations=off
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet amd_iommu=on iommu=pt"
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet intel_iommu=on iommu=pt"
#更新 GRUB 配置
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
sudo grub-mkconfig -o /boot/grub/grub.cfg
#验证是否开启
#dmesg | grep -i iommu
DMAR: IOMMU enabled
#cat /proc/cmdline
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-5.14.0-284.11.1.el9_2.x86_64 root=/dev/mapper/rl-root ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/rl-swap rd.lvm.lv=rl/root rd.lvm.lv=rl/swap rhgb quiet intel_iommu=on iommu=pt
##绑核