en.Wedoany.com Reported - At Microsoft Build 2026 in San Francisco, Microsoft released the open-source beta of Windows Subsystem for Linux (WSL) 3, further enhancing the Linux experience on the Windows platform. WSL 3 is being introduced as a preview feature and will gradually roll out to Windows 11 users. It can be obtained for free through existing WSL distribution channels without the need to purchase a separate SKU.
WSL 3 is not merely an iteration of its predecessor but an architectural transformation. WSL 1 relied on system call translation to run Linux binaries, while WSL 2 switched to a lightweight virtual machine using a real Linux kernel. WSL 3 retains the familiar wsl shell experience and supports running Linux containers within the system. Its core change lies in the communication method between Linux processes and underlying hardware, with a focus on reducing the intermediate layers between the Linux user space and Windows devices.
In terms of performance, Microsoft states that WSL 3 achieves "GPU and NPU with no performance loss." Compared to WSL 2, which runs graphics integration through a virtual machine, leading to additional context switching and performance overhead, WSL 3 adopts a new paravirtualization virtual machine approach. Paravirtualization provides a virtual machine while also offering direct access to native hardware. Microsoft claims this means Linux containers will run directly on Windows without additional configuration. Through a redesigned execution path, accelerators are introduced more directly into the Linux environment, reducing overhead. When running AI frameworks like PyTorch or TensorFlow inside WSL, performance will be closer to that of a native Linux host. Microsoft describes this strategy as the fastest way to run Linux-based AI workloads on a Windows PC, second only to running Linux on bare metal. Specifically, performance improvements will be evident on Copilot+ PCs and computers based on Qualcomm Snapdragon X Elite, Intel Meteor Lake and Lunar Lake architectures, while AMD chip support will not be available initially.
For users, the new design still appears operationally as "just WSL." The system is invoked via the wsl command and integrated into Windows, but the underlying architecture has changed how devices and accelerators are presented to Linux. Microsoft hopes WSL 3 will serve as a bridge, enabling Linux-first AI stacks to leverage Windows hardware without requiring developers to leave the Windows environment. Currently, when selecting a Linux virtual machine distribution, options include Ubuntu, Debian, OpenSUSE, Kali, Alpine, and others. WSL itself became open source in mid-2025, though some kernel-mode and file system components remain proprietary.
Microsoft expects WSL 3 to be more fully incorporated into the standard WSL distribution, at which point the default "wsl" experience on new Windows machines will be WSL 3. This transition is anticipated to arrive with Windows 11 26H2 this fall. Users wishing to try the WSL 3 preview feature need to join the Windows Insider Program and use the Preview Channel. Additionally, Microsoft has documented methods for obtaining the latest WSL pre-release via standalone packages and pre-release flags, such as running wsl –install in an elevated PowerShell, then running wsl –update –pre-release as an administrator to update to the latest pre-release version, or directly pulling the latest MSI installer from the Microsoft/WSL GitHub releases page.
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