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Graphics and Hardware: Mesa, RADV, NIR and DDR

Submitted by Roy Schestowitz on Tuesday 14th of July 2020 07:28:06 PM Filed under
Graphics/Benchmarks
  • Mesa 20.2's Nouveau Enables HMM, OpenCL SVM Now Supported

    The open-source NVIDIA "Nouveau" driver stack reached a new milestone today with the user-space code in Mesa 20.2 finally flipping on the Heterogeneous Memory Management (HMM) support.

    It's been a long road with the work done by Red Hat, NVIDIA engineers themselves on the open-source Nouveau HMM bits too, and the community in getting heterogeneous memory management mainlined and working. This has also been part of Red Hat's broader OpenCL/compute upbringing in recent years for the Nouveau driver stack. But finally today the HMM caps are set in exposing it in user-space for the NVC0 driver with Pascal GPUs and newer.

  • RADV Driver Lands Support For Vulkan Extended Dynamic State

    The newest addition to Mesa's RADV Radeon Vulkan driver is support for the recently published VK_EXT_extended_dynamic_state extension.

    VK_EXT_extended_dynamic_state debuted in late June with Vulkan 1.2.145 as an extension developed by the likes of Valve, Intel, NVIDIA, Google, AMD, and others. VK_EXT_extended_dynamic_state adds additional dynamic state for accommodating games/applications needing to reduce the number of pipeline state objects they compile and bind. The details are laid out in full via the Khronos spec.

  • Mike Blumenkrantz: aNIRtomy

    I’ve spent a lot of time talking about NIR and writing passes, so let’s take a shallow dive into what exactly that means.

    To start, there’s this idea of a “lowering” pass, where “lowering” means reducing or changing some part of the shader representation. These passes are run for various reasons, ranging from handling compatibility (e.g., the gl_FragColor -> gl_FragData[n] pass I discussed previously) to optimizing the shader by removing unused variables and instructions.

    [...]

    In this, the pass iterates over the shader’s functions, then creates a nir_builder (an object used for altering shader internals) while it iterates the blocks within the function. A function block is a group of instructions contained within a given scope, e.g., a conditional. The pass iterates into each block, looping over all the instructions and passing them to the lower_impl internal function for the pass, which is where all the work happens.

  • AMD Ryzen 9 3900XT Memory Scaling Performance Under 100 Different Tests

    For those thinking of picking up one of the new AMD Ryzen 3000XT series processors and weighing whether it's worthwhile on your budget picking up DDR4-3600 memory or other higher frequency DDR4 modules, here are some fresh benchmark results with the Ryzen 9 3900XT looking at 100 different tests on Linux and showing how the performance changes from DDR4-2133 through DDR4-3800.

  • JEDEC Publishes DDR5 Standard - Launching At 4.8 Gbps, Better Power Efficiency

    The DDR5 standard is expected to see the first DIMMs launching at a speed of 4.8Gbps, the Vdd is down to 1.1V (compared to 1.2V with DDR4), support for on-die ECC and other new features like decision feedback equalization, usage of MIPI I3C as the system management bus, and other improvements over DDR4.

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