大页内存

Centos 开启大页内存

系统：CentOS Linux release 7.7.1908 (Core)

编辑 /etc/default/grub ，在 GRUB_CMDLINE_LINUX 字段增加如下：

  • default_hugepagesz ：默认大页每页大小
  • hugepagesz ：大页每页大小，可选值：4K、2M（默认）、1G
  • hugepages ：大页数量
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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=auto rd.lvm.lv=centos_centos/root rd.lvm.lv=centos_centos/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet intel_iommu=off default_hugepagesz=1G hugepagesz=1G hugepages=40"

重新生成grub文件，重启host

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grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

Ubuntu 开启大页内存

系统：Ubuntu 18.04.5 LTS (GNU/Linux 4.15.0-112-generic x86_64)

编辑 /etc/default/grub ，在 GRUB_CMDLINE_LINUX 字段增加如下：

  • default_hugepagesz ：默认大页每页大小
  • hugepagesz ：大页每页大小，可选值：4K、2M（默认）、1G
  • hugepages ：大页数量
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# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="default_hugepagesz=1G hugepagesz=1G hugepages=2"

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

执行 update-grub ，生效配置

验证

查看系统大页内存，HugePages_Total = hugepagesz * hugepages 

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# CentOS
[root@k134 ~]# cat /proc/meminfo | grep -i huge
HugePages_Total:     100
HugePages_Free:       83
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB

# Ubuntu
root@inspur:~# cat /proc/meminfo | grep -i huge
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:      15
HugePages_Free:       15
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB

参考文档