Chapter 24 - Kernel Services and Configuration : question 24.2

tdendas

which of the following are valid ways to change runtime parameters

It says

A. sudo sysctl -p vm.nr_hugepages=8 is a correct answer ...

using that command gives me a "no such file or directory"

i guess it should be > sudo sysct vm.nr_hugepages=8

luisviveropena

Hi @tdendas,

It seems there is an issue with the setting of the answers. From the list, the correct one is:

sudo sh -c 'echo 10 > /proc/sys/vm/nr_hugepages'

Also you can use the '-w' flag to write, as follows:

luis@ubuntuserver:~$ sudo sysctl -w vm.nr_hugepages=12
vm.nr_hugepages = 12

luis@ubuntuserver:~$ sudo sysctl -a | grep vm.nr_hugepages
vm.nr_hugepages = 12
vm.nr_hugepages_mempolicy = 12

But that one is not in the answers (I got the flag from the man page).

Thanks for informing us of the issue!

Regards,
Luis.