Dev1 Galaxy Forum / Qemu question

Re: Qemu question

dummy@example.com (zapper) — Sun, 02 Nov 2025 19:26:25 +0000

@pcalvert hmm... perhaps... although I definitely saw a big improvement with changing kvm64,nx to max -smp 4.

The speed more than doubled when I did that at least.

As for virtualbox, I don't trust that software at all.

Virt-manager is closer to trustworthy, but meh...

@golinux I added the brackets

Re: Qemu question

dummy@example.com (pcalvert) — Sun, 02 Nov 2025 16:41:48 +0000

Depending on what you're doing, you may want to consider using Distrobox.

Distrobox
https://distrobox.it/

Re: Qemu question

dummy@example.com (pcalvert) — Sun, 02 Nov 2025 13:26:10 +0000

The poor performance of QEMU is why I switched to VirtualBox years ago, despite all the criticism of VirtualBox that I came across. Even though people were claiming that QEMU is faster than VirtualBox, in my experience it was the exact opposite.

I started using QEMU again about three years ago. Its performance still seems a bit slow, but it's acceptable for the Linux guest VMs that I've used it for. I wish I knew how to tweak it for better performance, though.

Re: Qemu question

dummy@example.com (HardSun) — Sun, 02 Nov 2025 01:35:18 +0000

Might be the OS you are emulating.
Have a look at the gentoo wiki for help.
https://wiki.gentoo.org/wiki/QEMU/Options

Re: Qemu question

dummy@example.com (golinux) — Sun, 02 Nov 2025 00:29:45 +0000

Or click on the [ code ] button in the list above the input window. Without the extra spaces, of course. They are needed here to make the function visible in text mode.

Re: Qemu question

dummy@example.com (ralph.ronnquist) — Sun, 02 Nov 2025 00:17:57 +0000

It's not that hard:

* start with an opening square bracket, the word code, a closing square bracket

* end with an opening square bracket, a slash, the word code, a closing square bracket

Or maybe you want it to be a bit peculiar?

Re: Qemu question

dummy@example.com (zapper) — Sat, 01 Nov 2025 23:31:33 +0000

@ralph its between apostrophes now.

I tried using -smp 4 instead of kvm,+nx

And the rest the same and that helped, but I wonder if it can be better than this.

Re: Qemu question

dummy@example.com (ralph.ronnquist) — Sat, 01 Nov 2025 22:36:46 +0000

if you were to use "code" tags around code, then where would they be?
(You should be able to edit your post if you would want to).

Qemu question

dummy@example.com (zapper) — Sat, 01 Nov 2025 21:20:35 +0000

How can I change the below to make it faster?

It usually takes like 30+ seconds to boot up my system in a vm when I type in password. How can I make it closer to the speed of my native OS?

The below?

"qemu-img create -f qcow2 Unknown.qcow2 60G"

#The above is for making the image

qemu-system-x86_64 -m 4096 -cdrom Unknown.iso -boot d Unknown.qcow2 --enable-kvm

#the above is for installing the image on the qcow2 built

qemu-system-x86_64 --enable-kvm Unknown.qcow2 -cpu kvm64,+nx -m 4096 -device AC97

#the above is for loading the installed qcow2 image built anytime

 qemu-system-x86_64 --enable-kvm Unknown.qcow2 -cpu kvm64,+nx -m 4096 -device AC97 -hdb /dev/sdb

This one is for loading usb drives in the qcow2.

The above is how I tend to build my images, run them, etc...

I read that cpu/ smp can help, but I am curious how much.

EDIT: between apostrophes is the code.

 qemu-system-x86_64 --enable-kvm Unknown.qcow2 -cpu kvm64,+nx -m 4096 -device AC97

Does the above help?