I am using qemu, with kvm and I load ubuntu 18.04 image, the qemu is loaded with the following command:
qemu-system-x86_64 -boot c -m 16G -smp 4 -vnc :0 -enable-kvm -drive if=virtio,file=ubuntu.qcow2,cache=none
I don't use libvirt.
I need to change hugepages from the default 2048kb to 1GB. I configured my host vm to support this size
Configuration:
cat /proc/meminfo | grep Huge
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
FileHugePages: 0 kB
HugePages_Total: 13
HugePages_Free: 13
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 1048576 kB
Hugetlb: 13631488 kB
and in the ubuntu, I configured
/etc/default/grub
and added
GRUB_CMDLINE_LINUX="default_hugepagesz=1G hugepagesz=1G hugepages=40”
and then run
grub-mkconfig -o /boot/grub/grub.cfg
Execution: after qemu was loaded, in the terminal I run the following commands:
cat /proc/meminfo | grep Huge
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
**Hugepagesize: 2048 kB**
cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.15.0-137-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro default_hugepagesz=1G hugepagesz=1G hugepages=40 maybe-ubiquity
Does anyone have an idea how to define the huge pages to be 1gb in this configuration?