How do I enable transparent huge pages by default on Ubuntu?

Question

How do I enable transparent huge pages by default on Ubuntu?

huge-pages, ubuntu

Solution

Adding the following:

transparent_hugepage=always

to GRUB_CMDLINE_LINUX_DEFAULT in your:

/etc/default/grub

and doing a:

update-grub

should do the trick.

Problem

How do I enable transparent huge pages by default on Ubuntu? ``` ~$ uname -a Linux yoda 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux ~$ cd /sys/kernel/mm/transparent_hugepage/ /sys/kernel/mm/transparent_hugepage$ ls defrag enabled khugepaged /sys/kernel/mm/transparent_hugepage$ cat enabled always [madvise] never /sys/kernel/mm/transparent_hugepage$ sudo echo always > enabled -bash: enabled: Permission denied /sys/kernel/mm/transparent_hugepage$ sudo ls [sudo] password for <...>: defrag enabled khugepaged /sys/kernel/mm/transparent_hugepage$ sudo ls defrag enabled khugepaged /sys/kernel/mm/transparent_hugepage$ sudo echo always > enabled -bash: enabled: Permission denied /sys/kernel/mm/transparent_hugepage$ cat enabled always [madvise] never ```

Original source

Accepted Answer

Adding the following:

```
transparent_hugepage=always
```

to GRUB_CMDLINE_LINUX_DEFAULT in your:

```
/etc/default/grub
```

and doing a:

```
update-grub
```

should do the trick.