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99 lines
3.6 KiB
ReStructuredText
99 lines
3.6 KiB
ReStructuredText
.. _requirements:
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Requirements and compatibility
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##############################
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.. _minimum:
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Required
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--------
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Linux host
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A Linux system capable of running KVM/QEMU and building the Looking Glass
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Client. The client requires an EGL-capable graphics driver. X11 and Wayland
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are supported. For a responsive passthrough setup, at least six CPU cores
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with twelve hardware threads are required.
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Windows guest
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A Windows 10 version 1903 or newer, or Windows 11, virtual machine. Looking
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Glass can create its own virtual monitor and does not require a physical
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monitor or dummy plug.
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Shared memory
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An IVSHMEM device large enough for the maximum guest resolution and refresh
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rate. The KVMFR kernel module is recommended and is required for direct GPU
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imports.
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Matching components
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The Looking Glass client, IDD, and OBS plugin (if used) must be of the same
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version. Legacy Host users must use the B7 stack described below.
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The IDD can fall back to software processing if the Windows guest has no
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suitable render GPU. This is useful for compatibility and basic applications,
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such as word processing and spreadsheets, but hardware processing is strongly
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recommended for lower latency and higher frame rates, especially games. Software
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mode is SDR-only and does not provide the same performance as the GPU path.
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.. seealso::
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:ref:`libvirt_determining_memory`
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.. _recommended:
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Recommended
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-----------
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For a responsive high-resolution setup, use:
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* a host CPU with eight cores and sixteen threads or better, with full
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performance cores around 3 GHz or faster;
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* the KVMFR kernel module rather than a plain shared-memory file;
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* a host GPU and driver that support direct DMA imports; and
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* a hardware render adapter in the Windows guest.
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Reserve at least two physical CPU cores, or four threads, for Linux. Looking
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Glass, QEMU, the Linux desktop and audio server all need host CPU time. High
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refresh rates also raise shared-memory and GPU bandwidth requirements.
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For a passed-through GPU, PCIe bandwidth can also limit performance. Use at
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least eight PCIe 3.0 lanes or four PCIe 4.0 lanes where practical.
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.. _connected_display:
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Physical display and dummy plugs
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--------------------------------
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The IDD does not require a physical display or dummy plug: it creates a virtual
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Windows monitor, including on systems without a passed-through display output.
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A physical display, dummy plug or another virtual monitor is only required
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when using the :doc:`Legacy Host Application </legacy_host>`, because that
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application captures an existing Windows display.
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.. _igpu_kvmfr_recommended:
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Host GPU notes
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--------------
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AMD and Intel host GPUs commonly support the DMA-BUF path used by KVMFR. This
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can reduce CPU work and avoid an extra system-memory copy. It is particularly
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important for integrated GPUs, which already share memory bandwidth with the
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CPU.
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NVIDIA host GPUs require a driver configuration that supports DMA-BUF import.
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If direct import is unavailable, the client falls back to a software copy.
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Looking Glass still works, but uses more CPU and memory bandwidth.
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Windows and HDR
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---------------
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Windows 10 (version 1903 or newer) remains supported. Current HDR and
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wide-color-gamut display features depend on newer IddCx interfaces that the
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driver checks at runtime, so they are normally available only on a compatible
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Windows 11 installation. The IDD continues to use its SDR-compatible path when
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those interfaces are unavailable.
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Native HDR presentation on Linux requires the EGL renderer, Wayland
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``color-management-v1`` support in the compositor, and an HDR-capable output.
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When native HDR is unavailable, the client can map HDR content to SDR.
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