Real Computer vs Virtual Computer Performance Showdown
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We all know that running a virtual machine on your hardware has the potential to add some overhead to performance tasks... But can we quantify that overhead? TunnelBear message: TunnelBear is the easy-to-use VPN app for mobile and desktop. Visit tunnelbear.com to try it free and save 10% when you sign up for unlimited TunnelBear data. EVGA VR Edition link: linustechtips.com Pricing & discussion: linustechtips.com Support us: linustechtips.com Join our community forum: bit.ly twitter.com @LinusTech Intro Screen Music Credit: Title: Laszlo - Supernova Video Link: youtube.com iTunes Download Link: itunes.apple.com Artist Link: soundcloud.com Outro Screen Music Credit: Approaching Nirvana - Sugar High youtube.com Sound effects provided by freesfx.co.uk
The video investigates whether running a system in a virtualized environment, specifically using Unraid and KVM, incurs noticeable performance overhead compared with running directly on bare metal hardware. It starts by laying a foundation on what virtualization means, using a network interface card analogy to contrast a physical NIC with a virtual NIC, and explains how virtual devices share underlying hardware resources. The host machine is described in detail, including its CPU, GPU, memory, and the approach of reserving a CPU core for the hypervisor to optimize gaming performance. The presenter then runs a controlled set of benchmarks across both virtualized and bare-metal configurations, noting that gaming performance remains largely equivalent while memory and cache tests reveal modest overhead in certain workloads. The results suggest that for many consumer-oriented tasks the gap between virtual machines and native hardware is small, with virtualization becoming a viable alternative for consolidating functionality in a home or consumer-focused setup. The discussion broadens to potential consumer benefits, such as easier maintenance, backup, and the possibility of extending virtualization concepts to more user-friendly products like Unraid, particularly in gaming-centric scenarios. The overall conclusion is that bare-metal performance is not dramatically sacrificed by virtualization for the tested workloads, opening up practical paths for home users to adopt VM-based setups without sacrificing game or application performance. The video also includes a plug for VPN service TunnelBear and an invitation to engage with the community forum and affiliate links, wrapping up with prompts to watch another related video. The takeaway is that virtualization is approaching parity with native performance for many typical tasks, while offering organizational and flexibility advantages that appeal to enthusiasts and home users alike.
Topics · technology · computers · virtualization · gaming
Questions answered
- What is the main difference between bare metal and virtualized performance in this showdown?
- The video shows that for the tested workloads, especially gaming, virtual machines can approach bare-metal performance with only minor overhead in some memory and cache intensive tasks, making VM-based setups viable for typical consumer use.
- Why does the presenter reserve a CPU core for Unraid in the test?
- Reserving a core ensures Unraid has dedicated resources to manage virtualization efficiently, which helps maximize performance for virtual machines and provides a fair comparison with native hardware.