Public bug reported:
Problem :
The following warning message is noticed when booting guest backed by
hugepages.
"2018-03-28T07:45:18.500173Z qemu-system-ppc64: System page size
0x40000000 is not enabled in page_size_mask (0x11000). Performance may
be slow"
Guest bootsup, however the warning message is see in qemu.log.
Test Environment :
Boston-LC
Linux : 4.15.0-12-generic
NAME="Ubuntu"
VERSION="18.04 LTS (Bionic Beaver)"
ID=ubuntu
Guest is backed by hugepages. Guest xml
<memoryBacking>
<hugepages>
<page size='1048576' unit='KiB'/>
</hugepages>
</memoryBacking>
Host Hugepages.
cat /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
4
One the guest is started, we see the warning message in the qemu.log
cat /var/log/libvirt/qemu/Hari_compact_mode.log
----
----
----
2018-03-28T07:45:18.370804Z qemu-system-ppc64: -chardev pty,id=charserial0:
char device redirected to /dev/pts/2 (label charserial0)
2018-03-28T07:45:18.500173Z qemu-system-ppc64: System page size 0x40000000 is
not enabled in page_size_mask (0x11000). Performance may be slow
Leonardo/Breno,
Is it possible we can request canonical to backport the below commit
into Ubuntu 18.04 level ?
https://github.com/qemu/qemu/commit/30f79dc13f116a79ff45d37ad0f5c035012064a7
** Affects: qemu (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-166118 severity-medium
targetmilestone-inin18043
** Tags added: architecture-ppc64le bugnameltc-166118 severity-medium
targetmilestone-inin18043
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https://bugs.launchpad.net/bugs/1806104
Title:
[Ubuntu-18.04][LTC-Test] Warning: "qemu-system-ppc64: System page size
0x40000000 is not enabled in page_size_mask (0x11000). Performance may
be slow" Noticed while booting guest backed by Hugepages.
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