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Message #187038
[Bug 1584597] Re: Hyper-V Memory Ballooning re-broken in 16.04
Thanks. In both VMs, it looks like the buff/cached memory dropped by
2GB. After some time, did the Hyper-V host eventually reclaim this
memory? Can you check if the Hyper-V host's assigned memory also drops
after some time?
Also, can you tell us if you tried this on an older build where it
doesn't repro?
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https://bugs.launchpad.net/bugs/1584597
Title:
Hyper-V Memory Ballooning re-broken in 16.04
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
Triaged
Bug description:
Regression: #1294283 fixed memory ballooning in Hyper-V in 14.04, but
the bug has returned in 16.04.
Steps to reproduce:
1. Create Gen2 Hyper-V VM
2. Install Ubuntu 16.04
3. modprobe hv_balloon
Memory usage according to Hyper-V Manager will not change
This has been reproduced on 2 fresh Ubuntu Server 16.04 instances.
I installed linux-generic-xenial on a 14.04 instance, rebooted,
modprobe'd hv_balloon and memory usage in Hyper-V Manager reduced to
the correct level.
Environment:
Host: Windows NanoServer 2016
Ubuntu Server 16.04 version_signature: `Ubuntu 4.4.0-21.37-generic 4.4.6`
Ubuntu Server 14.04 version_signature: `Ubuntu 4.4.0-22.40~14.04.1-generic 4.4.8`
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References