Qemu performance reddit. •. QEMU/KVM with VFIO passthrough kinda slow. -----. CPU: i7 6700K 4. 1. In general USB works quite good but when VM is on load I am always facing some issues with Webcams and headsets plus I cannot passthrough my Logitech Brio 4K webcam at all A lot of the discussion thread over the internet seems to date from a few years back, or had posts from guys who compared both a few years ago. Rock_Me-Amadeus • 2 yr. qemu-static is quite similar to Rosetta (1 and 2). I am looking for a rule of thumb like if it takes TaskX 5 second on a i3 windows 7 Home host, it will take about 10 in QEMU. 5%-7,5% on my Ryzen 2600X ( 6 Cores with 2 Threads each). Use qemu-img convert to convert the mounted raw image into a qcow2 image. -smp is used to tell QEMU how many vCPUs it is going to create, and also describes the VM CPU Topology. Learn from the experience of a Linux enthusiast and gamer who has tested various configurations and scenarios. a Windows 10 VM. Performance is flawless running at 3840x2160. GPU (GTX 1080), SSD (Samsung 850 EVO r/w cca 520MB/s) and DVD-RW Drive are being passed to vm. After adding huge pages and mitigations equals off in grub, I ran some benchmarks and was pleasantly surprised. You'll find tons on Google. /r/kentuk - the sub-reddit for the Garden of England. 2-rc1 Released - TCG For AVX/AVX2, Massive 9pfs Performance Improvement Feb 12, 2022 · There's probably ways to improve the disk performance (USB isn't going to be the fastest way to provide a block device I suspect) and the graphics performance (using virtio-gpu so the guest has an actual 3D-capable device), but for the CPU, there isn't really anything beyond "use a faster host CPU". Also, remember that spice is not good enough for games I have tried installing QtEmu and virt-manager but have had no luck, putting a long command within Powershell has been my only success so far. Oct 17, 2023 · I have used QEMU/KVM in Fedora, and it was superior in comparison to VirtualBox or the free version of VMWare. easily agree. These userspace emulators can end up being surprisingly fast because they don't need to I had trouble using QEMU/KVM, because you can't take snapshots of a VM that uses Secure Boot, which Windows 11 requires. Games run at high fps most of the time, but here's the catch. u/Eric_Odijk has a dual boot solution here in the comments. To be clear, I'm NOT looking to play games or GPU-intensive tasks, and can't GPU passthrough on my laptop. KVM is also used in certain type-1 hypervisors like QEMU/KVM virGL graphics performance varies wildly depending on the guest system I have two virtual machines on my arch host that I manage using virt-manager. On top, you can also isolate those same ones on the host so that at the end of the day, ONLY the VM is executing on them, including scheduling. iOS already have an awesome port of QEMU with UTM, and I managed to run older DirectDraw titles like NFS 2 SE and NFS 3 HP in Software mode ronaldtrip • 5 yr. My setup has a Intel i7 6800k. I personally recommend the ArchWiki one. That and I believe VMWare has much better support for legacy OSes or did last time I was using it heavily. Qemu/kvm is probably superior to vbox in basically every way. Run the executable named "setup" in the folder you just extracted. zip you just downloaded. In particular, I'm interested in usermode emulation, as this should be faster in theory as it does not need to emulate a full system but instead pretty Otherwise you go with Intel GVT-g or full GPU passthrough. 2 SSD 1TB r/w cca 3GB/s. BTW, I start my virtual machine with 2 hard-disk & 1 network interface from the CLI with something like this: -enable-kvm \. the main game I've been playing lately is valorant. This includes Throughout the entire It's a bare-metal hypervisor like KVM. I use UTM which does decently well at emulating XP, but for w10/w11 definitely go with parallels and utilize windows’ x86 “Rosetta” which works pretty well so far. I have a Windows 10 VM running under KVM on Linux. That said, KVM for me is always faster and zero hassle with screen resolutions. One is Debian Unstable, one is Arch Linux with KDE Unstable and the Testing repos enabled. You need to make sure you get this correct for decent VM performance. The OVA functionality makes it easy to do backups or transfer VMs between people. This guide will show you how to do that with detailed steps and explanations. Right now I have a pretty good setup that can run a few apps and the browser moderately fast on QEMU using this long command on powershell. Originally I thought this was related to playing through PulseAudio but when testing it's performance, I would hear minor distortion but not the same severe stuttering. 0-2-amd64 kernel. Setting up QEMU is harder than setting up VirtualBox, but if you need to eke out the last bit of performance, it'll be worth it. Where as the Vmware/Qemu-KVM tests are run from a mechanical drive. Raspberry PI Qemu Performance (Fastest architecture to choose for Raspberry PI 4) I need to run an old version of Debian on a Raspberry PI to support an older device driver. qemu-system-x86_64 -m 24G -machine type=q35,accel=hvf -smp maxcpus=8,cpus=7,cores=4,threads=2 -cpu Nehalem hardDiskImage. ifyoudothingsright1 • 10 mo. It's a fairly powerful machine. When your "passing through" a CPU core, your not actually passing it through at all. I also disliked Spice, so here I am. I've allocated 4cores and 4gb ram to an endeavour os vm. Everything is snappy and fast, including heavier programs like Microsoft Teams. Sound and video also work perfectly. I run a barrier server in my Linux VM and the mac is running the client. On my Kubuntu gaming desktop, I use QEMU/KVM for all of my virtualization due to being able to do GPU passthrough & being generally faster than VirtualBox. I've tried Limbo and QEMU on Termux (including trying out the custom made fork with SPICE support), and all of them have issues (Limbo with crackling sound issue, and QEMU Termux with performance issues). Recently I have set up a Win10 vm for gmaing on linux host system (Debian 11) and its performance is low. And once it's setup and working you do not need to tweak much. win10_gaming_vm. Performance 75-99% depending on game. The big benefit of VMWare that you lose with kvm/qemu is the easy portability to non-linux hosts. My 2 cents is if you need Windows x86/x86-64 probably will want another solution. hd0,media=disk,index=0,if=virtio \. I've changed disks back and forth, (ide gave me better performance than VirtIO strangely After getting the VM working, I'm running into really poor performance. My launch script: #!/bin/sh WINIMG=Windows10_LTSC. Qemu/KVM will provide decent/usable 3D performance on Windows hosts but VMWare is miles ahead. Will try to add one in virt-manager. My coworker/mentor recently just talked about UTM, which seems interesting and might Zero. The reason gns3 runs badly under esxi is because it runs virtualized under virtualization, it's called nested virtualization. Unfortunaly it seems that the VM performance while gaming is way lower than running on bare-metal. img,if=virtio -m 6144 \ -vga qxl --display spice-app,gl=off \ -cpu host,pdpe1gb,topoext Right click > "Extract all" from the . The VirtIO and plan9 drivers are much better performers, but are difficult to figure out how to use with command line KVM/QEMU. It's a laptop, so I don't expect stellar performance, but it's been kinda wonky. If anyone says vbox has better performance than qemu/kvm then they have no idea what they are talking about. I got 3053 points in Windows 10. someone posted a video on this on youtube If someone exists who is putting good content about termux on youtube, you gotta let me know who. If insisting on using qcow2, you should use qemu-img create -o preallocation=falloc,nocow=on. I need to be able move from machine to machine having access to my system where I am limited to accounts with limited rights: ex library, school, internet cafe. I read that best performance one could get when passing through the whole USB controller via vfio but this is not possible for me as I need the LAN USB adapters on host side. That's because a bare metal ubuntu installation allows gns3 direct access to the qemu/kvm virtualization layer. Xen also has GPU passthrough but also better performance in utilizating the same GPU as the host OS. Sadly this doesn't work as shown any longer. They're almost unplayable due to rampant hitching and stuttering. Is there any speed benefit to selecting an arm Hyper-v will typically preform better, though in linux it has no 3d acceleration, vbox's 3d accel isn't all that great in the first place so I don't think it's worth it. Crossover office might work for now for some applications. 2. is there any advantage of running MacOS on QEMU+KVM instead of hackintosh? For the majority of people, no. Currently I have a setup with Ubuntu Server 20. However all the developers seem focused on Windows 95 might not be a good first try. If you are experiencing performance issues when enabling Hyper-V on Windows 11 Guest, you may want to check out this Reddit thread. VirtualBox limits you to OpenGL 2, while VMWare supports OpenGL 3. Qemu actually works really well on Windows. and I get performance that is not distinguishable at all from bare metal (aside form only having 8/16 threads available) when setting up cpu, i recommend to set it up so it is 2 sockets, 4 cores 1 thread for example (dedicating 8 threads) instead of 1 socket, 4, cores, 2 threads - it will give better performance My goal is to have a small system that I can load onto a USB stick or an external drive. I suspect it is related to CoW being enabled because of snapshots. I did try a software emulated TPM but the VM errored out on startup saying it couldn't find it. Its just the previous poster said, not polished, and there are long running issues that still warrant that "experimental software" software warning you pointed out (Eg HAXM doesn't run on Windows 10 Home). VirGL is very much broken at this point still and unlikely to ever see a fully functional stable implementation, some GPU Passthrough Performance. i dont know if i should install something in my host system Every CPU topology is different and you will often find some cores are core1=thread0+1 and others are combinations like core1=thread0+7. how are you launching it, the various options you enable and don't make a very significant difference, if possible an apples to apples comparison should be done. In MacOS installation screen. I also tried passthrough using CRB, and I certainly do have a /dev/tpm0 device The problem I'm running into is with CPU performance. I would like to know if anyone has any input on VM guest graphic performance on Proxmox vs. vmware has the best 3d acceleration of them all (unless you want to compile qemu In any case, once you have all the dependencies installed, you simply need to run the run. I've enabled the AMD SVM option in BIO and Enabled IOMMU and I've the kvm modules loaded in the kernel. 04 and I would like to be able to play a few games which I can't get to work on linux. I have installed chrome OS flex on a 7th gen Lenovo Thinkpad X1 Carbon with core-i7 10th gen 16GB 512GB. Gaming with VirtualBox is not really a thing unless you play very old games that would probably run on WINE. I actually just moved from Ubuntu to Fedora this week because I updated to 22. Fedora performs slower in a lot of things. After that it will be ready to go out-of-the-box. Currently using an NVIDIA GTX 1060 6 GB discrete card, but looking at upgrading to a Radeon 7600 at some point this year. My needs aren't super great, with the most advanced gaming I do currently supported by Steam (Borderlands 3 and the 2019 Battletech release) under Linux. VMware is a type 1 hypervisor; an extremely small OS optimized for (and only used for) hosting (and managing) VMs. • 2 yr. The second is recent, but only compares to a native install. qcow2 In the virtual machine I use gnome as desktop environment, and Remote Desktop (via xrdp) to connect to the machine from a Windows 11 host with 4K display resolution. Ubuntu 20. to your config, if you are using a script. Cpu to be host-passtrough (also, just passtrough all your cores, FX cpus are not treated like intel cpus, if you start a vm you will see that in the debug) My experience is the exact opposite from other posts. Best long term performance method is: touch, chattr +C, fallocate -l and then point virt-manager to it. Note: We have gone private until June 14th in response to Reddit's recent API changes. In any other case, VMWare virtual 3D device is the most advanced/well performing. I run desktop VMs like Ubuntu Desktop, Fedora Desktop and Windows 10. Recently, I wanted to dual-boot Linux with Windows, but I couldn't due to battery problems. Probably similar to how it exposes HT "cores". Try installing AntiX Linux and see what kind of performance you got. Windows 10 will automatically go online and grab decent drivers for the video but Windows 95 did not do that. The networking is also easy to understand and set up. Whether you are a kernel developer, a hobbyist, or a Windows 11 enthusiast, you can join this community and share your experience and knowledge with QEMU and KVM. This is the script I use to create/mount the raw image, bootstrap it Anyway, if there's any poor souls reading this with an RX 550 scratching their heads as to why it ain't working, here's what to try. Just disk a CrystalDiskMark Sequential on both my raw img file and partition that are both used in my VM, and my img is actually outperforming my partition in read and write (sometimes) with my read being about 50Mb/s on both and the write being ~20Mb/s. When the VM is idle (0-1% CPU utilization in Task Manager) the underlying qemu-system-x86_64 process is consuming 15-20% of a CPU core. Considering how slow it runs on Microsoft's own Qualcomm QC710 Windows ARM development kit, this can mostly be attributed to the speed of the comes down to the hardware configuration and goal. this has been solved, scroll down. Im looking into switching to an Ubuntu host and I then tried virt-manager/qemu which was somewhat okay, but now I'm using qemu and launch it through a file to keep control over my stuff. However the main advantage of btrfs on this level would be the snapshot support, and this is given also by qcow2 and (potentially) of the btrfs system of the guest VM on a finer level. (I posted the same question into r/yocto but seems no one can help me, hope here I'll be more lucky) I set up all that I need (CAN Bus device, display, network, etc. Performance will be relatively poor, but might be more than good enough for some small niche things. Oct 9, 2018 · If you want to enjoy gaming on virtual machines with KVM/QEMU and PCI passthrough, you need to optimize the performance of your host, guest, qemu and libvirt settings. As well, I’ve enjoyed playing around with Lima for setting up quick and easy Ubuntu Server VMs, both ARM and x86. Qemu can be fast with KVM. in valorant the GPU utilization will not go above 9%. QEMU/KVM with virt-manager should be comparable to Virtualbox. Comparatively, my drive should be getting at least The situation might be different if you have a dedicated VM partition with no snapshots enabled. VirtualBox Ubuntu Performance On An Intel Core i9 7900X. How ever, it turns out that Virtualbox doesn't support OpenGL/DirectX which makes gfxbench/3dmark to fail running. iso qemu-system-x86_64 -accel kvm -drive driver=raw,file=drive. Inside the guest, use a file system that supports snapshots. q35 with cpu passthrough bluescreens during passmark test q35+qemu cpu is too much of a performance hit on the cpu EDIT2: I have no idea what happened. Workstation is like Virtualbox. Support. Apr 7, 2022 · On the surface, both platforms may seem similar. -global ICH9-LPC. So my main OS is ubuntu 20. MrPiggens. Many games will not work but the last 2 months they made many improvements and got a lot more games running. This allows for passthrough devices to be added to macOS on newer hardware. QEMU/HAXM should also work on Mac and Windows, though it's less mature at the moment. I would say KVM offers you a 5-10% performance hit on native. Drwankingstein. iso VIRTIMG=virtio-win-0. Could be related to not being AMD optimized but even a normal Pentium is pretty demanding, you might have to go even lower to 486 for 100% speed. It's not perfect but it's the best you can get without GPU passthrough. Hi, I’m having an issue with my win 10 gaming VM where after a certain amount of time my computer completely turns itself off & reboots back to the host OS, but this only happens when I set my CPU governor to “performance” mode & I need to set my governor to performance because if not, certain games proceed to have micro stutters every 5 seconds, no overclocks are applied. KVM allows QEMU to use hardware virtualization features, which provides overall faster virtual machine (VM) performance when compared to a product like VirtualBox. Virtualbox is okay, especially if using the same virtualization across host OSes was important, but QEMU/KVM is the better investment. The host is running Arch Linux. zir_blazer. But it lags like hell, it's extremely slow and the screen tears really bad when i move windows. I've tried to install Windows 10 a few times already, I've noticed poor performance right from the start, with a noticeably laggy mouse cursor. I'm using libvirt to manage it, if it matters. It doesn't sound impressive but it's probably best case scenario due to good single core on a recent IS and IPC performance. My QEMU/KVM Windows 7 VM is running at full speed now, and its great. Increasing the amount of video memory allocated in the virtual machine's settings has helped somewhat, but display refresh is still slow enough that you Windows 11 for ARM runs *unbelievably* fast in a UTM virtual machine on the Apple M1. Going down into the specifics, check out the differences between the two platforms. I erased and formatted the "virtualdisk" to macOS Journaling System, then reinstall ed macOS Catalina on the drive i have formatted. qcow2. View community ranking In the Top 20% of largest communities on Reddit QEMU 7. VirtualBox is a type 2 hypervisor: an app you install on top of your OS, which means that there are less resources left for your VMs. You can't game in a VM unless the game is either very old, or you do PCIe passthrough. YES. When you add a CPU core to a VM it just allows QEMU to spawn another QEMU thread, same as any other multithreaded Yocto QEMU emulation ARM64 - Laggy performance. Qemu without KVM is incredibly slow. VirGL and Virtio are the same. The actual performance loss is 5. I basically want to use virtual machine (arch based distro for host and guest) for gaming and test how the performance is different between host and guest and possibly use only guest for games if performance will be okay since I dont want to fill my host sytem with all the gaming clients and snaps and other gaming related stuff. This will run the whole install process, then ask you to reboot. My 1165g7 laptop can just about barely do entry Pentium at 100%. It is a userspace emulator (which focuses just on translation of CPU instructions). I use Windows 10 VMs from time to time for non-intensive operations (teams, msword, etc). "This PC can't run Windows 11". MUCH slower disk IO. I personally feel Fedora is faster and snappier, though that’s probably because it’s a fresh install. Whereas qemu is a full system emulator (emulates all the hardware). it is worth noting hyper-v qemu and vmware can all work at the same time with whpx accel. Qemu/KVM may be underrated at end user level because it lacks flashy GUIs. Granted this is running on Rosetta copy of qemu. I’m not that familiar with macOS as this is the first time I’ve ever used it (job requirement). Youtube desperately needs a "Title in English but entirely spoken in Hindi" filter, a "Can't speak English so I'll do a full screen demo in small type, while playing an annoying music loop" filter, and a "Roel Van de Paar" filter. QEMU can be very laggy if the CPU model doesn't mimic the host. As you have discovered gns3 runs amazingly well on a bare metal ubuntu/debian installation. Video performance is poor. View community ranking In the Top 1% of largest communities on Reddit Is qemu/kvm + sshfs good enough performance-wise for this? I'm looking to use a virtual machine with Windows installed to manage my media files from the host system (in terms of organization, searching, and maybe video playback). 1 (no GUI) and KVM/QEMU/libvirt. -drive file=w10. I've recently made the switch from VirtualBox to KVM/qemu running virt-manager front-end. I wasn't able to resolve it so I ended up passing on TrueNAS entirely. I have an i386 version running great and I am happy but was wondering why the heck I didn't pick an ARM version of Debian. 04. If you check with filefrag you'll see the fragmentation explode over time with a non Bad performance KVM - QEMU. As the title says I am running Windows 10 Pro N in a KVM / QEMU / libvirt setup with an i7-7700K processor. Based on the documentation it sounds like it could be easy to port and a near-native performance user-mode virtual machine on Android would be really great. VirtIO drivers really improves the performance of a Windows guest in Qemu. First off, try adding. 1-desktop-amd64. I made a pop os vm, it doesn't tear but still slow as shit. In virt-manager, the Hypervisor it's showing for my VM is "QEMU CTG" and when I try to `virsh edit` my VM to set the CPU type as 'host-passthrough' the VM errors on Hey, I wanted to make linux VMs for personal use, so i installed qemu, virt manager, libvirtd on my host machine (endeavour os). Performance 99%. additionally, its cheaper and less pain to buy a second hand "gaming" pc from facebook for Linux and use your I tried using virtio with Windows Server and what I encountered was that the write performance was extremely bursty and seemed run into some sort of caching conflict I couldn't resolve. . ) I just have a very laggy experience with the GUI. 04 vs. zeldaink • 18 hr. Qemu/KVM supposedly beats everyone as far as raw performance is concerned although not always in a significant way for your standard LAMP stacks or such Java applications. However, Ubuntu does boot up faster. GPU pass through: Harder to setup, more than 99% of windows games will work. HugePages (static not transparent) 2. Except media playback is somehow worse, but I'm sure I can resolve that later. Troubleshooting. Hi, I am running a windows 10 qemu/kvm and im having issues with GPU performance. The downside to using Hyper-V is that the graphics performance is limited by the Disable smooth scrolling, and disable HW acceleration overall. Windows 10 Guest Performance under QXL/VirtIO. -net nic,model=e1000,model=virtio \. Speaking initially and just regarding performance, GPU performance for Windows is best on Parallels but otherwise on par with UTM. VMWare promised never to emulate x86 on M1. The first one is 3 years old, so only for WSL 1. This game has an especially bad issue with this but it happens in all games. I pass through 8 cores, 36gb of ram and a secondhand RX 460 from eBay to the mac VM. User Mode Linux has not been ported to arm! It only works with x86 at the moment. No, it is underrated at the end user level because, like so many things Linux, it is a build-it-yourself solution. This worked pretty well, thanks. The sub isn't called VFIO for nothing. On the host machine, GeekBench gave me a result of 4129 (single core) and 15669 (multi-core). I allocated 8 cores to my VM and edited the topology as follows: sockets: 1, cores: 2, threads: 4, with 8192MB of RAM allocated. 240. Also VirtualBox is better for running legacy stuff like Windows and Solaris. High KVM/QEMU CPU utilization when Windows 10 guest is idle. Learn from other users who have successfully Archlinux ISO is not used. I have tried various tricks from reddit. Windows 10 WSL/WSL2 Performance In 170+ Benchmarks. As mentioned, UTM is a nice front end for this. VirGL is what sits on the VM and interfaces with the Virtio-GPU, Virtio-GPU sits on your host and then interacts with your physical GPU. It works 'okayish' for the most part however I suffer from a bit of a 'lag' that seems to be related to the video driver for qemu. 1. sh script. OS install, then install Windows 11 in a VM to be my new daily driver. Here are some comparisons you might find useful: Windows 10 WSL vs. Both of the userspace IO and Network drivers are slow. Virtualbox doesn't use KVM, QEMU does use KVM, making QEMU faster than Virtualbox and VMWare. After you reboot you should hear the ear-grating Windows startup noise and sound should work fine. 3. I now wonder if QEMU would serve me better for tasks Hyper-V is a great choice for virtualizing Windows because Windows comes with built-in Hyper-V support and drivers, meaning all you need to do to get your guest VM up and running is install Windows on it. He also has links to other comparisons on pdp10. Posted by u/Jako81624 - 7 votes and 4 comments it does look like q35+qemu cpu gives a substantial improvement to 2D performance. Currently i dualboot win10 and ubuntu and I find myself now only booting into windows for a few specific games. 04 and it made my system painfully slow. To archive that I've set up a windows 10 VM using kvm and qemu with a dedicated gpu for passthrough. 0GHz, 4-cores, 8-threads RAM: 32GB System Drive: M. You can tell UTM to use Apple Virtualization (Rosseta). The test results appear to indicate that the non-virtual and docker tests are running on an SSD drive. To solidify some of the “maybes” here, yes you can, with QEMU. I am passing through my USB audio device to my Windows 10 VM with the the qemu-system-x86_64 command line -device usb-host,vendorid=0x046d,productid=0x0a5b VirtualBox has better desktop integration and it's easier to use. Use virgl and force-enable hardware acceleration. I'm assuming it's because I don't have a TPM assigned. Parallels will not run x86 code currently. But here's some reasons why you may prefer it: Easier snapshots, less time fiddling and more time working (super important if your hack is a work machine) Allows for hardware emulation like for unsupported NICs, storage drives, audio just the title, every vm i create has a bad performance, it dont matter if is linux or windows, to all my vm's i assigned 2 cores and 2gb of ram because my pc have only 4gb of ram so i dont know if that is the reason why all vm i create are so laggy and unresponsive , i tried using virtio for video but that doesnt improve performance. acpi-pci-hotplug-with-bridge-support=off. Write would be fast, then stop completely, then start again super fast, then stop completely. Your host still has complete access to the core and can continue to do whatever it wants with it. qemu-system-x86_64 -hda ubuntu-20. I have Hugepages enabled and cpus pinned (according to the die topology, tried different configurations and weirdly did not see any significant performance differences) and isolated (via systemd). the real problem is having a big enough PC resource pool available for the VM without choking both the host and guest. That’s not the only difference though. However, I'm still having ongoing issues. I already tried some guides with no luck, still laggy or worse (display not shown) Nov 22, 2020 · It took probably 6-8 min to get to desktop. in other games it usually hovers around 40-60%. The conclusion is that qemu+kvm is significantly faster. I expected better performance but I'm not sure if If that isn't the case, consider their installation. QEMU/KMV. ago. The current VirtualBox does have KVM paravirtualization for Linux. But technology is evolving fast. Try enabling KVM and use Cirrus Logic vga with: -accel kvm -vga cirrus. That said, they have a fundamental difference. r/qemu_kvm is a subreddit for the qemu-kvm/libvirt virtualization stack, where you can find tips, tutorials, questions, and discussions about using QEMU with KVM to run various guest operating systems. Sounds like an issue related to CPU settings. I used Cinebench R20, since I know this pretty much only benchmarks the CPU and not much else. X-Post from r/pcmasterrace. A place to post photos, links, articles and discussions relating to Kent, UK. Plain Qemu lacks of many, many performance tweaks it supports. Nov 30, 2023 · From a pure performance perspective, QEMU is the faster platform since it utilizes kernel-based virtual machine support (KVM). There are no other steps. Using raw and not qcow2. Granted it only takes a minute but closing down everything im doing for the sake of running one game is starting to grate a bit. Rather: Create a raw image via truncate (in RAM) Mount the image using a loop device. Both parameters are creating 4 vCPUs Threads on the host, the difference between them is that in one you're telling the guest OS that all 4 Cores are the same (4C/4T), and in the other you're telling it that there . Similar is box86 which is another userspace emulator. My current benchmarks put the single-core performance at around 87% of the host's native performance, and 72% for multi-core performance using Geekbench 4. A noticeable factor as GPU performance is important but UTM still runs Windows okay with correct scaling but a little harder and involved to setup. Virtualbox vs QEMU performance (running photoshop) I have Virtualbox installed and thought I would benchmark the guest os with "optirun" on/off to see if it makes any difference. I have a Threadripper Pro 3955WX with two GPUs for desktop VMs (linux and macOS). I have been looking around for some benchmarks on how fast qemu is when running in usermode and full system mode (so plain emulation, not virtualization which is near-native performance AFAIK). They recently added the feature of GPU passthrough so if you're interested in that kind of thing you might be okay with KVM. For Linux, UTM is better as it's basically identical in terms of QEMU/KVM virt-manager windows vm very slow. We're running about half our servers on KVM/QEMU and our performance is fantastic. I have a need to deploy a rather "snappy" win10 guest inside qemu kvm. Lots of choice and options which make it flexible, but also a lot of choice and options which make it less than a one-stop-shop. Full Windows is not likely practical. Status: There is a good VM solution by u/farmerbb in the comments. Prepare the block device in the exact fashion as in the script above. You will find useful tips and discussions on how to tweak the hyperv features in your XML configuration file, such as relaxed, vapic, spinlocks, vpindex, runtime, synic, stimer, reset, vendor_id, and frequencies. Abysmal VirtIO performance in QEMU. kurupukdorokdok. Nvme== 3-6GB/s SSD==600MB/s Mechnical==90-130MB/s. I don't need that last bit of performance, so VirtualBox is better for my needs. I doubt QEMU performance penalty is this high, but I would appreciate comments from other 5950X owners. regular KVM/QEMU install. The host concerns a Debian Unstable on a 4. I understand that the answer depends on a few things: the hardware of the host, the stuff running in the background of the host, the type of tasks running in the guest, the os used in the quest, etc. With the following QEMU script, I'm unable to get a CPU score of above 6260 with any modification I make to the smp parameter. How can i make it at least usable for (for example) web browsing? I don't mind gl acceleration and don't use it. Got something to share here. The big performance boosters are: 1. Reason being I hate all the microsoft trash but because of various reasons I need to use teams on almost daily basis. In general, QEMU is both an emulator and a virtualization software while VirtualBox is only a virtualization software. Wine: Easier setup but not without issues. KVM isn't good at utilizing the same GPU as the host OS. duioqhqhuiqhnkubsjbd