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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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QEMU: How to increase VRAM allocation? (self.linux)

submitted 5 days ago* (last edited 3 days ago) by proxy to c/[email protected]

8 comments fedilink hide all child comments

I'm having trouble allocating more VRAM to my QEMU virtual machine. Currently, I'm using the following command to launch my VM:

qemu-system-x86_64 -enable-kvm -boot menu=on -drive file=QEMU -m 2G -cpu host -vga virtio

Can anyone help me figure out how to increase the VRAM allocation in QEMU?

Solution by [email protected] qemu-system-x86_64 [...] -vga qxl -global qxl-vga.vram_size_mb=128 -global qxl-vga.ram_size_mb=128

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[–] [email protected] 7 points 5 days ago (1 children)

Not sure, but maybe the QXL driver will help:

qemu-system-x86_64 [...] -vga qxl -global qxl-vga.vram_size_mb=128 -global qxl-vga.ram_size_mb=128

[–] proxy 3 points 4 days ago (1 children)

It's an improvement, but 500MB+ would be perfect.

[–] [email protected] 4 points 4 days ago* (last edited 4 days ago) (1 children)

Replace the value 128 to 512. And try again :)

[–] proxy 4 points 4 days ago

I was under the impression that QXL driver were capped at 256MB too, thanks.

[–] [email protected] 6 points 4 days ago (3 children)

Vga is fixed iirc, the original frame buffer was tiny, the emulated one gives you 16mv

Cirrus logic gives you 16mb too iirc, then you can use other drivers that give you more,

https://www.kraxel.org/blog/2019/09/display-devices-in-qemu/

[–] proxy 3 points 4 days ago* (last edited 4 days ago) (1 children)

If I'm reading correctly, there isn't a modern GPU driver for QEMU that supports customizing VRAM?

[–] [email protected] 4 points 4 days ago* (last edited 4 days ago)

Qxl does, it's fairly modern.

Otherwise you have virtio and virglrenderer, which are as modern as it gets this side of pcie pass through or intel's sriov.

[–] proxy 2 points 4 days ago* (last edited 4 days ago)

Thanks the list is very useful.