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[Jason Couture <plaguethenet@xxxxxxxxx>]

So both VM's are still sitting at the same memory usage according to hyper-v.
Memory demand hasn't seemed to budge either.

I tried this on a 15.10 box we had, and got very different results. I
logged in (Server needs a GUI for some tools) and memory went from 2gb
to 6gb. I did a few things, did a uname -a to get the kernel version,
and then logged out.

While the allocated memory stayed at 6gb, the memory demand dropped to
about 2gb(I missed the demand in the first screenshot, you'll have to
take my word at it).

In constrast (Screenshot #6), the VM is still demanding 4.5GB vs the 2.8
that it's using. Buffers are back up to 3.0gb though, I can rerun the
commands and wait a few minutes to see if you think that'd make a
difference.


I increased memory pressure by setting almost all VM's reserve buffer to 100%, alot of VM's had memory ballooned out for use for other VM's except for the 16.04 machines. (Screenshot 10)


It seems except for the one time the VM had memory removed, the 16.04's are reporting a high demand.

Is there anything else I can try to help you out?


** Attachment added: "1584597-Screenshots-20160701.zip"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1584597/+attachment/4693662/+files/1584597-Screenshots-20160701.zip

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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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