1. 修改grub

CentOS7中grub存放位置在：/etc/default/grub

初始內容如下：

1 [root@dellserver default]# catgrub2 GRUB_TIMEOUT=5

3 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

4 GRUB_DEFAULT=saved5 GRUB_DISABLE_SUBMENU=true

6 GRUB_TERMINAL_OUTPUT="console"

7 GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap isolcpus=1--1 nohz_full=1--1 rcu_nocbs=1--1 default_hugepagesz=1GB hugepagesz=1GB hugepages=226 rhgb quiet"

8 GRUB_DISABLE_RECOVERY="true"

9 [root@dellserver default]#

修改后內容如下：

intel_pstate=disable? 這個選項在amd的cpu上配置；在intelcpu上不要配置此選項，否則系統啟動不來。

1 [root@dellserver default]# catgrub2 GRUB_TIMEOUT=5

3 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

4 GRUB_DEFAULT=saved5 GRUB_DISABLE_SUBMENU=true

6 GRUB_TERMINAL_OUTPUT="console"

7 GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap isolcpus=1-31 nohz_full=1-31 rcu_nocbs=1-31 default_hugepagesz=1GB hugepagesz=1GB hugepages=226 rcu_nocb_poll audit=0 nosoftlockup nmi_watchdog=0 selinux=0 intel_pstate=disable rhgb quiet"

8 GRUB_DISABLE_RECOVERY="true"

9 [root@dellserver default]#

支持虛擬機的配置如下：

1 [root@dellserver ~]# cat /etc/default/grub2 GRUB_TIMEOUT=5

3 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

4 GRUB_DEFAULT=saved5 GRUB_DISABLE_SUBMENU=true

6 GRUB_TERMINAL_OUTPUT="console"

7 GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet iommu=pt intel_iommu=on LANG=zh_CN.UTF-8 isolcpus=1-31 nohz_full=1-31 rcu_nocbs=1-31 default_hugepagesz=1GB hugepagesz=1GB hugepages=226 rcu_nocb_poll audit=0 nosoftlockup nmi_watchdog=0 selinux=0 intel_pstate=disable rhgb quiet"

8 GRUB_DISABLE_RECOVERY="true"

9 [root@dellserver ~]#

作用是將cpu的1-11 lcore在啟動時分離開，不將進程跑在這些CPU的核上。

作用是在系統啟動時將hugepage的默認大小設置為1GB，并創建8個1GB的hugepage。

2. 重新編譯image

CentOS7.5的系統，在當前目錄執行grub2-mkconfig -o /boot/grub2/grub.cfg得到結果如下：

1 [root@dellserver default]# grub2-mkconfig -o /boot/grub2/grub.cfg2 Generating grub configuration file...3 Found linux image: /boot/vmlinuz-3.10.0-957.27.2.el7.x86_644 Found initrd image: /boot/initramfs-3.10.0-957.27.2.el7.x86_64.img5 Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_646 Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img7 Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64.debug8 Found linux image: /boot/vmlinuz-0-rescue-62e95b1bacd848bc81b207e1c62ec2e69 Found initrd image: /boot/initramfs-0-rescue-62e95b1bacd848bc81b207e1c62ec2e6.img10 done

11 [root@dellserver default]#

CentOS7.4的系統，在當前目錄執行grub2-mkconfig -o?/etc/grub2-efi.cfg?得到結果如下：

1 [root@dellserver default]# grub2-mkconfig -o /etc/grub-efi.cfg2 Generating grub configuration file...3 Found linux image: /boot/vmlinuz-3.10.0-957.27.2.el7.x86_644 Found initrd image: /boot/initramfs-3.10.0-957.27.2.el7.x86_64.img5 Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_646 Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img7 Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64.debug8 Found linux image: /boot/vmlinuz-0-rescue-62e95b1bacd848bc81b207e1c62ec2e69 Found initrd image: /boot/initramfs-0-rescue-62e95b1bacd848bc81b207e1c62ec2e6.img10 done

11 [root@dellserver default]#

3. reboot

重啟server后，配置生效。可用過cat /proc/cmdline查看結果：

1 [root@dellserver ~]# cat /proc/cmdline2 BOOT_IMAGE=/vmlinuz-3.10.0-957.27.2.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet iommu=pt intel_iommu=on LANG=zh_CN.UTF-8 isolcpus=1-31 nohz_full=1-31 rcu_nocbs=1-31 default_hugepagesz=1GB hugepagesz=1GB hugepages=226 rcu_nocb_poll audit=0 nosoftlockup nmi_watchdog=0 selinux=0 intel_pstate=disable rhgb quiet3 [root@dellserver ~]#

總結

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