@l-ububtu-3 What was the procedure on the reinstall? Based on my results, I will add some more checks to our long-term testing efforts to see if ballooning messages are being dropped.
An explanation of Hyper-V dynamic memory in general is here: https://technet.microsoft.com/en-us/library/hh831766(v=ws.11).aspx For the Linux driver the process is relatively straightforward. When there's less memory pressure than what is allocated, the guest balloon driver allocates buffers to itself and releases that memory to Hyper-V. As a result, the Linux guest will think the memory is there but in use, but Hyper-V will report a lower assigned memory. When there is more pressure than what is available, free, first the balloon driver will request memory and release the buffers it had allocated when they are assigned. If there are no more buffers available, Hyper-V will assign more memory and the driver will "hot add" that memory to the guest. If there is no pressure, nothing will change. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1584597/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
