Qemu question

zapper · 2025-11-01 21:20:35

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?

Last edited by zapper (Yesterday 19:31:15)

ralph.ronnquist · 2025-11-01 22:36:46

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).

zapper · 2025-11-01 23:31:33

@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.

ralph.ronnquist · Yesterday 00:17:57

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?

golinux · Yesterday 00:29:45

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.

HardSun · Yesterday 01:35:18

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

pcalvert · Yesterday 13:26:10

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.

pcalvert · Yesterday 16:41:48

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

Distrobox
https://distrobox.it/

The officially official Devuan Forum!

#1 2025-11-01 21:20:35

Qemu question

#2 2025-11-01 22:36:46

Re: Qemu question

#3 2025-11-01 23:31:33

Re: Qemu question

#4 Yesterday 00:17:57

Re: Qemu question

#5 Yesterday 00:29:45

Re: Qemu question

#6 Yesterday 01:35:18

Re: Qemu question

#7 Yesterday 13:26:10

Re: Qemu question

#8 Yesterday 16:41:48

Re: Qemu question

#9 Yesterday 19:26:25

Re: Qemu question

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