Which is better? VirtualBox with KVM or Virt-Manager with KVM/QEMU

General system Applications
21

I too use Windows (C#) but I’m not going to install it on a drive-through. I’ve been using it as a VM which is enough for my studies and work. But always had issues with performance. Virt just solved it for me :smiley: .

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22

I just moved from VBox to virt-manager and the difference in performance is just abysmal, I have an ASUS ROG:
6 Intel Hyper-Threading Technology CPUs
16GB RAM

Assigning any type of configuration to my VMs there was no difference between 2vCPU 4GB vRAM and 6vCPU 8GB RAM setup… the performance was always the same, EXTREMELY poor on my Linux Distros, not to mention Windows.

Now my question, how can I maximize the resolution for my VMs?

My host OS is Fedora 37.

23

Did you mean QEMU/KVM? virt-manager is just that - a GUI that accesses different virtual machines. I’m really surprised that your performance is so bad. On a typical Linux VM, I use these settings:

  • Overview
    • Hypervisor: KVM
    • Chipset: Q35
    • Firmware: UEFI
  • Add hardware
    • [x] Controller → VirtIO SCSI
  • Boot Options
    • [x] Enable boot menu
      • [x] SCSI Disk 1 (on VirtIO SCSI controller)
      • [x] SATA CDROM 1
  • CPUs
    • Configuration
      • [x] Host-passthrough
      • [x] Topology
        • [x] Manually set CPU topology
          • Sockets: 1
          • Cores: 4
          • Threads: 2

Switching to the VirtIO SCSI controller allows you use use the fstrim.service.