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I'm trying to enlarge video memory size of qxl-vga device. Guest os (windows 7) shows only 16mb of video memory available. I've installed windows guest tools. When I'm trying to set more video memory there is still only 16mb available on the guest. Also performance doesn't change either. In fact even cursor is a bit laggy. I'm launching guest with that script

KVM_DIR=/var/lib/libvirt
IMAGE=win7.qcow2
NAME=win7
PORT=5914
RAM=4000
IFACE=win7
qemu-system-x86_64 -enable-kvm -m $RAM -drive file=$KVM_DIR/images/$IMAGE,if=virtio \
-name $NAME -device qxl-vga,id=video0,vgamem_mb=64,bus=pci.0,addr=0x2 \
-spice port=$PORT,disable-ticketing -netdev tap,id=$IFACE,ifname=$IFACE \
-device virtio-net-pci,netdev=$IFACE -balloon virtio

My host is running Arch Linux:

% uname -a
Linux m0x35-pc 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 x86_64 GNU/Linux

Qemu version:

% qemu-system-x86_64 --version
QEMU emulator version 2.4.1, Copyright (c) 2003-2008 Fabrice Bellard

Win7 video settings

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  • Try setting ram_size and vram_size as well. See here: ovirt.org/documentation/draft/video-ram
    – Marc.2377
    Commented Jul 24, 2017 at 22:47

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