Hyper-V dynamic RAM efficiency?

Question

Windows

Good afternoon!
Share your experience, which is better: to assign a constant amount of RAM for virtual machines, or to set a dynamic interval?
Does Hyper-V manage to produce volume, does it slow down?
The load on RAM can grow either instantly or gradually.

Answer 1

Well, with fixed memory, it immediately allocates the entire volume, regardless of whether the machine needs it or not.
With dynamic memory, it allocates like any program in Windows - how much they ask for so much and gives ...
Nothing should slow down

Answer 2

There will be no brakes.
PS.
In the days of Hyper-V based on WinServ2008R2, I sometimes experienced a glitch in a Linux VM if dynamic memory was enabled: at some point, kswapd0 ate 100% cpu.
On the Internet, I have only seen an explanation for memory ballooning in Xen. But I observed this on Hyper-V and RHEL (either 6 or 5) as a guest.
I won’t say anything about now, because it’s already 2012R2, and newer cores and only a pre-allocated amount of memory.

Answer 3

Stop. For fatty services, the brakes will just be. For example, I selected from 8 to 16 for mssql. Otherwise, it shamelessly slowed down. If anything, this is a sequel to sharepoint, however, this also applies to sharepoint and to ekschendzhu and to the office server. It is safe to give to a domain controller, dhcp, certificate and even a file service. Here you can start from 512, but of course do not set it to such values, it will take a long time