This bug is causing some serious issues for us with the 16.04 rollout.
We oversubscribe which is admittedly our problem, and our 16.04 VM's
spike to 8gb during boot, but then settle at a reasonable 2gb, but the
VM continues to hog 8gb to itself. We have 5 total, so that's a grand
total of 30GB that's held for no reason at all.
We get a single set of messages from the balloon driver at boot, and then
nothing at all.
This is all we get:
[ 62.565094] hv_balloon: Received INFO_TYPE_MAX_PAGE_CNT
[ 62.565153] hv_balloon: Data Size is 8
uname -a:
Linux ContainerHost1 4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:27:37 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
/proc/version_signature:
Ubuntu 4.4.0-24.43-generic 4.4.10
free -h:
total used free shared buff/cache available
Mem: 7.9G 2.3G 4.8G 9.9M 830M 5.5G
Swap: 2.0G 721M 1.3G
Hyper V shows 7790MB assigned to this VM.
Hyper-V settings are set for 512-8192MB, with a 20% buffer.
According to Hyper-V's description of dynamic memory, this VM should
only have 2.76GB of ram attached to it at this point in time.
Hyper-V host is 2012 R2
Do we have any confirmation that this is actually a bug? Or any ETA on a
fix?
Can I help you collect more info to fix the problem?
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https://bugs.launchpad.net/bugs/1584597
Title:
Hyper-V Memory Ballooning re-broken in 16.04
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