AMD PSF Control Support Still Awaiting The Mainline Linux Kernel

It's been three months since AMD published a security whitepaper outlining the possibility of a side channel attack with PSF. The Predictive Store Forwarding functionality is new to AMD Zen 3 (Ryzen 5000 / EPYC 7003 series) processors and as part of their security analysis they are allowing users the ability to opt-out of using this feature in the name of greater security but the feature still hasn't been picked up for the mainline Linux kernel.

10 Hours Ago - AMD - Predictive Store Forwarding - Add A Comment
Left 4 Dead 2 Vulkan Performance With Radeon Graphics On Linux

Last week Valve introduced Vulkan rendering support for Left 4 Dead 2. The L4D2 Vulkan support is similar to that of Portal 2 where DXVK is being leveraged for translating the Direct3D calls to Vulkan rather than relying on their OpenGL translations. For those wondering what this means for L4D2 performance on Linux with modern GPUs, here are some benchmarks of Left 4 Dead 2 when testing the OpenGL and Vulkan rendering options.

18 Hours Ago - Linux Gaming - 20 Comments
Crocus Gallium3D Adds Experimental Intel Gen8 Graphics, Overlapping With Iris Driver

Landing in mainline Mesa 21.2 development code last week was the "Crocus" Gallium3D driver for old Intel hardware spanning from the Intel 965 chipset days "Gen4" up through Crocus supporting Haswell "Gen7" graphics. The i965 to Haswell span has been the focus since the official Intel "Iris" Gallium3D driver already in Mesa supports the Broadwell "Gen8" up through all current Intel UHD/Xe Graphics. But now Crocus with the latest Mesa code has added Gen8 support.

20 Hours Ago - Intel - Crocus - 5 Comments

22 June

Intel Lands More Open-Source Vulkan Driver Changes For Ray-Tracing

Even though Vulkan ray-tracing support on Intel graphics hardware isn't coming until Xe HPG avaiability, Intel's Linux graphics driver developers have been preparing since last year. In preparation for the Xe HPG launch, Intel's open-source talent have for many months already been preparing the Vulkan ray-tracing functionality wither another batch of code being merged today.

22 June 07:00 PM EDT - Intel - Intel Vulkan Ray-Tracing - 6 Comments
FreeBSD 13.0 vs. DragonFlyBSD 6.0 vs. Linux On AMD EPYC 7003 Series "Milan"

For those wondering how well the likes of FreeBSD 13.0 and DragonFlyBSD 6.0 performance on AMD's EPYC 7003 "Milan" processors launched earlier this year, here are some initial benchmarks of those BSDs alongside a few Linux distributions. With recently having a Tyan 1U server in the lab with EPYC 7543 32-core processor, I've been running a number of BSD benchmarks on it given these recent BSD releases have been running well on this 1P server.

22 June 07:30 AM EDT - Operating Systems - 7 Comments
Haiku R1 Beta 3 Aims For Release In About One Month

The Haiku open-source operating system inspired by BeOS has been in development since 2001. It took until September 2018 for the Haiku R1 Beta and then last summer was succeeded by Haiku R1 Beta 2. Now a year later the third beta for this inaugural release is now approaching.

22 June 12:00 AM EDT - Operating Systems - Haiku R1 Beta 3 - 15 Comments

21 June

AMD SEV/SEV-ES Local Migration Support Patches For Linux

Google engineers have prepared a set of Linux kernel patches allowing for AMD Secure Encrypted Virtualization (SEV) / SEV-ES encrypted state to allow for local migration support of these encrypted virtual machines on the same host.

21 June 02:56 PM EDT - AMD - AMD SEV Local Migration - 1 Comment
Running The New Intel OpenGL "Crocus" Gallium3D Driver On Sandy Bridge

Merged this past week was Crocus as the new open-source Intel Gallium3D driver developed by the community and used for Gen4/i965 through Gen7/Haswell generations of Intel graphics. This week I ran some Crocus benchmarks on Intel Haswell comparing against the existing i965 classic Mesa DRI driver while in this article are some comparison driver benchmarks using Intel Sandy Bridge graphics for those still running those once popular processors.

21 June 09:30 AM EDT - Display Drivers - 18 Comments

20 June

AMD Continues Working To Mainline Their PTDMA Driver For Linux

Published all the way back in September 2019 was a Linux driver for supporting the Pass-Through DMA controller for EPYC processors. The PTDMA hardware allows for high bandwidth memory-to-memory and I/O copy operations. Now mid-way through 2021 that AMD PTDMA Linux driver remains in the works and is up to its tenth driver revision while waiting to see if it's now ready for mainline or further changes are still deemed necessary.

20 June 03:25 PM EDT - AMD - PTMA Driver v10 - Add A Comment
Linux 5.13 Lands More Fixes To The Mucked Up FPU/XSTATE Handling Mess

Earlier this month Linux 5.13 disabled Intel's ENQCMD functionality for upcoming Xeon "Sapphire Rapids" processors as the kernel software code around it was deemed "broken beyond repair". More of the recent Intel-submitted patches around reworking kernel code in preparation for upcoming CPU features has been found to be rather hairy after already being mainlined and thus another batch of urgent x86 fixes were sent in this morning.

20 June 07:23 AM EDT - Intel - Linux 5.13 XSTATE - 9 Comments
Mesa Lands Work Around Async glFlush - Should Help Workstation Performance

While vendors are increasingly just focused on Vulkan (and Direct3D under Windows), there still is plenty of OpenGL software out there especially in the workstation space where software vendors are slow to adapt. Well known RadeonSI OpenGL developer Marek Olšák of AMD landed another performance optimization this week that should benefit the likes of SPECviewperf.

20 June 06:19 AM EDT - Mesa - Asynchronous glFlush - 7 Comments

19 June

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