You have been subscribed to a public bug:
16G Huge Pages are not supported on PowerNV (bare metal) installations. Ubuntu
16.04.2 still allows 16G huge pages to be turned on.
Contact Information = Mike Hollinger (mchol...@us.ibm.com)
---uname output---
Linux aprilmin4 4.4.0-83-generic #106-Ubuntu SMP Mon Jun 26 17:53:54 UTC 2017
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8335-GTB
---Debugger---
A debugger is not configured
---Steps to Reproduce---
1. Add the following to the kernel boot args (either via editing the petitboot
boot option manually, or updating /boot/grub/grub.cfg:
default_hugepagesz=16G hugepagesz=16G hugepages=4
2. Boot Linux
3. Observe that the kernel believes 16G huge pages are available:
ubuntu@aprilmin7:~$ cat /proc/meminfo | grep -i huge
AnonHugePages: 475136 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 16777216 kB
ubuntu@aprilmin7:~$ ls /sys/devices/system/node/node0/hugepages
hugepages-1024kB hugepages-16384kB hugepages-16777216kB
Stack trace output:
no
Oops output:
no
System Dump Info:
The system is not configured to capture a system dump.
*Additional Instructions for Mike Hollinger (mchol...@us.ibm.com):
-Post a private note with access information to the machine that the bug is
occuring on.
-Attach sysctl -a output output to the bug.
This may be recreated on any bare metal POWER8 server with Ubuntu 16.04.2; I
haven't checked other versions of Ubuntu.
** Affects: ubuntu-power-systems
Importance: Medium
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-156931 severity-medium
targetmilestone-inin---
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Possible to turn on 16g huge pages on Ubuntu 16.04.2 PowerNV
https://bugs.launchpad.net/bugs/1706247
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