Hi,
dfor 19.04 it should be fixed once we merged qemu 3.1 which is the current
plan, but for SRUs I'm not so sure.
The backport isn't hard at all, but removing a warning is certainly not worth
an SRU cycle and dropping an update of qemu to everybody out there.
How about keeping it open for now and bundling it with whatever the next SRU
will be?
Would that be ok for you?
** Also affects: qemu (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: qemu (Ubuntu Bionic)
Importance: Undecided
Status: New
** Tags added: qemu-19.04
** Changed in: qemu (Ubuntu Bionic)
Status: New => Triaged
** Changed in: qemu (Ubuntu Cosmic)
Status: New => Triaged
** Changed in: qemu (Ubuntu)
Status: New => Triaged
** Changed in: qemu (Ubuntu)
Importance: Undecided => Medium
** Changed in: qemu (Ubuntu Bionic)
Importance: Undecided => Low
** Changed in: qemu (Ubuntu Cosmic)
Importance: Undecided => Low
** Description changed:
+ [Impact]
+
+ * There is a message which was identified more confusing and misleading
+ than helpful that should be dropped to avoid users being unsure about
+ it.
+
+ * Fix: Just apply upstream change dropping the message
+
+ [Test Case]
+
+ * Run power8 (cpu model on qemu) guest on power9 system and check guest
+ log in /var/log/libvirt/qemu/<guestname.log>
+
+ * these should allow someone who is not familiar with the affected
+ package to reproduce the bug and verify that the updated package fixes
+ the problem.
+
+ [Regression Potential]
+
+ * This drops a warning (that was almost never useful and often
+ confusing). But it had no functional change to the behavior,
+ therefore no regression should be seen at all (unless somebody
+ missing the old message counts).
+
+ [Other Info]
+
+ * n/a
+
+ ----
+
Problem :
- The following warning message is noticed when booting guest backed by
hugepages.
+ 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>
+ <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
** Description changed:
[Impact]
- * There is a message which was identified more confusing and misleading
- than helpful that should be dropped to avoid users being unsure about
- it.
+ * There is a message which was identified more confusing and misleading
+ than helpful that should be dropped to avoid users being unsure about
+ it.
- * Fix: Just apply upstream change dropping the message
+ * Fix: Just apply upstream change dropping the message
[Test Case]
- * Run power8 (cpu model on qemu) guest on power9 system and check guest
- log in /var/log/libvirt/qemu/<guestname.log>
+ * Run huge page backed power8 (cpu model on qemu) guest on power9 system
+ and check guest log in /var/log/libvirt/qemu/<guestname.log>
- * these should allow someone who is not familiar with the affected
- package to reproduce the bug and verify that the updated package fixes
- the problem.
+ * these should allow someone who is not familiar with the affected
+ package to reproduce the bug and verify that the updated package fixes
+ the problem.
[Regression Potential]
- * This drops a warning (that was almost never useful and often
- confusing). But it had no functional change to the behavior,
- therefore no regression should be seen at all (unless somebody
- missing the old message counts).
+ * This drops a warning (that was almost never useful and often
+ confusing). But it had no functional change to the behavior,
+ therefore no regression should be seen at all (unless somebody
+ missing the old message counts).
[Other Info]
-
- * n/a
+
+ * n/a
----
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
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1806104/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
