随笔记录

目录

1. 背景介绍

2. 麒麟SP1 系统修改大页

2.1 查询大页信息

2.2 通过kernel cmdline配置大页 

2.3 生成配置

2.4 查看配置是否生效

2.5 查询大页是否配置成功

3. CenOS 系统修改大页

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1. 背景介绍

若操作系统当前Hugepagesize不是2048kB，则只能通过修改kernel cmdline的方式进行配置修改，此方式在系统重启后仍然生效。

不同Linux发行版本的配置方式有所不同

2. 麒麟SP1 系统修改大页

2.1 查询大页信息

[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# cat /proc/meminfo|grep -i hugepage
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:      15
HugePages_Free:       15
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:     524288 kB
[root@ptg97 Python-3.8.13]# 

2.2 通过kernel cmdline配置大页 

# 修改“/etc/default/grub”文件中“GRUB_CMDLINE_LINUX”对应行，添加“default_hugepagesz=2M hugepagesz=2M hugepages=1024[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# cat /etc/default/grub 
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=1024M,high rd.lvm.lv=klas/root video=VGA-1:640x480-32@60me rhgb quiet  smmu.bypassdev=0x1000:0x17 smmu.bypassdev=0x1000:0x15 video=efifb:off video=VGA-1:640x480-32@60me"
GRUB_DISABLE_RECOVERY="true"
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# vi /etc/default/grub 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# cat /etc/default/grub 
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
#GRUB_CMDLINE_LINUX="crashkernel=1024M,high rd.lvm.lv=klas/root video=VGA-1:640x480-32@60me rhgb quiet  smmu.bypassdev=0x1000:0x17 smmu.bypassdev=0x1000:0x15 video=efifb:off video=VGA-1:640x480-32@60me"
GRUB_CMDLINE_LINUX="crashkernel=1024M,high rd.lvm.lv=klas/root video=VGA-1:640x480-32@60me rhgb quiet  smmu.bypassdev=0x1000:0x17 smmu.bypassdev=0x1000:0x15 video=efifb:off video=VGA-1:640x480-32@60me default_hugepagesz=2M hugepagesz=2M hugepages=1024"
GRUB_DISABLE_RECOVERY="true"
[root@ptg97 Python-3.8.13]# 

2.3 生成配置

注意“grub.cfg”所在目录在不同版本系统中会有所不同

执行“grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg” 生成配置，然后重启系统注意“grub.cfg”所在目录在不同版本系统中会有所不同，[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# find /boot -name grub.cfg
/boot/efi/EFI/kylin/grub.cfg
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# grub2-mkconfig -o /boot/efi/EFI/kylin/grub.cfg 
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.19.90-23.8.v2101.ky10.aarch64
Found initrd image: /boot/initramfs-4.19.90-23.8.v2101.ky10.aarch64.img
Found linux image: /boot/vmlinuz-0-rescue-12b759ac8f8e48e0a406e01c68af06a0
Found initrd image: /boot/initramfs-0-rescue-12b759ac8f8e48e0a406e01c68af06a0.img
Adding boot menu entry for EFI firmware configuration
done
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# 
[root@ptg97 Python-3.8.13]# reboot

 重启后，继续检查

2.4 查看配置是否生效

执行“cat /proc/cmdline”，查看配置是否生效# cat /proc/cmdline[root@ptg97 ~]# 
[root@ptg97 ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.19.90-23.8.v2101.ky10.aarch64 root=/dev/mapper/klas-root ro crashkernel=1024M,high rd.lvm.lv=klas/root video=VGA-1:640x480-32@60me rhgb quiet smmu.bypassdev=0x1000:0x17 smmu.bypassdev=0x1000:0x15 video=efifb:off video=VGA-1:640x480-32@60me default_hugepagesz=2M hugepagesz=2M hugepages=1024
[root@ptg97 ~]# 

2.5 查询大页是否配置成功

# cat /proc/meminfo|grep -i hugepage[root@ptg97 ~]# cat /proc/meminfo|grep -i hugepage
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:    1024
HugePages_Free:     1024
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
[root@ptg97 ~]# 
[root@ptg97 ~]# 

3. CenOS 系统修改大页

root@bogon ~]# 
[root@bogon ~]# 
[root@bogon ~]# cat /etc/default/grub 
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
#GRUB_DEFAULT=1
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
#GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=cs/root rhgb quiet"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=cs/root rhgb quiet isolcpus=1,3 nohz_full=1,3 rcu_nocbs=1,3 iommu=pt intel_idle.max_cstate=0 idle=poll intel_pstate=disable"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG=truepcie_aspm=off
[root@bogon ~]# vi /etc/default/grub 
[root@bogon ~]# 
[root@bogon ~]# grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg 
Generating grub configuration file ...
Adding boot menu entry for EFI firmware configuration
done
[root@bogon ~]# 
[root@bogon ~]# 
[root@bogon ~]# cat /proc/meminfo|grep -i hugepage
AnonHugePages:     98304 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:    1024
HugePages_Free:     1024
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
[root@bogon ~]# 
[root@bogon ~]#