** Also affects: linux-raspi-5.4 (Ubuntu Focal)
Importance: Undecided
Status: New
** Package changed: linux-raspi-5.4 (Ubuntu) => linux-raspi (Ubuntu)
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https://bugs.launchpad.net/bugs/1933532
Title:
Large Page support disabled on Raspberry Pi kernels
Status in linux-raspi package in Ubuntu:
New
Status in linux-raspi source package in Focal:
New
Bug description:
It appears that large page support and transparent hugepages are
disabled in config on the Raspberry Pi. It would be nice if they were
enabled in the kernel configuration, even if they are disabled by
default. Then they could be set in user-editable config via the
"transparent_hugepage" boot option.
With 4GB hardware in this family, there might be valid uses for large
pages.
root@ubuntu:/home/ubuntu# hugeadm --explain
hugeadm:ERROR: kernel does not support huge pages
root@ubuntu:/home/ubuntu# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
root@ubuntu:/home/ubuntu# uname -a
Linux ubuntu 5.4.0-1038-raspi #41-Ubuntu SMP PREEMPT Thu Jun 17 14:14:11 UTC
2021 aarch64 aarch64 aarch64 GNU/Linux
root@ubuntu:/home/ubuntu# grep -i huge /boot/config-5.4.0-1038-raspi
CONFIG_SYS_SUPPORTS_HUGETLBFS=y
CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
CONFIG_HAVE_ARCH_HUGE_VMAP=y
# CONFIG_TRANSPARENT_HUGEPAGE is not set
# CONFIG_HUGETLBFS is not set
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