An improvement to the open-source NVIDIA NVK Vulkan driver, authored by Mary Guillemard, has been merged for the Mesa 26.3 release. This change is designed to benefit Valve’s Gamescope micro-compositor, specifically improving performance during game recording and remote play.
The update exposes the BAR as host cached. According to the merge request, “nouveau will always uses CPU cached mappings unless we are on Tegra and need coherency. This patch advertises host cached on BAR memory type. This is needed for gamescope as it explicitly search for a memory type that is host visible and cached. Before this patch this would cause it to always select sysmem for any allocations that need to be mappable. This should hopefully at least help game recording and remoteplay performance a bit.”
The improvement is slated for inclusion in Mesa 26.3 and may also be back-ported to the current Mesa 26.2 stable series. No performance numbers were provided to quantify the impact of the change.
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