nixpkgs/nixos/modules/virtualisation/hyperv-guest.nix
jrp2014 788d8769f7 nixos/virtualisation.hypervGuest: use elevator=noop
Microsoft recommends the NOOP I/O scheduler for disk performance in HYPER-V:

https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/best-practices-for-running-linux-on-hyper-v

> NOOP is a first-in first-out queue that passes the schedule decision
> to be made by the hypervisor. It is recommended to use NOOP as the
> scheduler when running Linux virtual machine on Hyper-V.
2020-02-09 19:50:13 +01:00

65 lines
1.7 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.virtualisation.hypervGuest;
in {
options = {
virtualisation.hypervGuest = {
enable = mkEnableOption "Hyper-V Guest Support";
videoMode = mkOption {
type = types.str;
default = "1152x864";
example = "1024x768";
description = ''
Resolution at which to initialize the video adapter.
Supports screen resolution up to Full HD 1920x1080 with 32 bit color
on Windows Server 2012, and 1600x1200 with 16 bit color on Windows
Server 2008 R2 or earlier.
'';
};
};
};
config = mkIf cfg.enable {
boot = {
initrd.kernelModules = [
"hv_balloon" "hv_netvsc" "hv_storvsc" "hv_utils" "hv_vmbus"
];
kernelParams = [
"video=hyperv_fb:${cfg.videoMode} elevator=noop"
];
};
environment.systemPackages = [ config.boot.kernelPackages.hyperv-daemons.bin ];
security.rngd.enable = false;
# enable hotadding cpu/memory
services.udev.packages = lib.singleton (pkgs.writeTextFile {
name = "hyperv-cpu-and-memory-hotadd-udev-rules";
destination = "/etc/udev/rules.d/99-hyperv-cpu-and-memory-hotadd.rules";
text = ''
# Memory hotadd
SUBSYSTEM=="memory", ACTION=="add", DEVPATH=="/devices/system/memory/memory[0-9]*", TEST=="state", ATTR{state}="online"
# CPU hotadd
SUBSYSTEM=="cpu", ACTION=="add", DEVPATH=="/devices/system/cpu/cpu[0-9]*", TEST=="online", ATTR{online}="1"
'';
});
systemd = {
packages = [ config.boot.kernelPackages.hyperv-daemons.lib ];
targets.hyperv-daemons = {
wantedBy = [ "multi-user.target" ];
};
};
};
}