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Kernel: Intel, Power Management, and Encryption

Submitted by Roy Schestowitz on Tuesday 16th of February 2021 06:07:12 PM Filed under
Linux

  • Intel Looking To Finally Upstream Linux Driver For Their Gaussian & Neural Accelerator - Phoronix

    Found with mobile Intel CPUs across Tiger Lake, Ice Lake, and even Cannon Lake has been the Intel GNA accelerator. This Gaussian & Neural Accelerator is also found with Intel Gemini Lake processors and various development kits. The Intel GNA has been backed by an out-of-tree Linux driver while now the company is finally working to upstream their GNA support in the Linux kernel.

    Intel's Gaussian and Neural Accelerator is a neural co-processor that can be used for offloading inference workloads. The GNA on modern Intel laptops has been used for tasks like noise reduction and speech recognition, assuming you setup the out-of-tree Intel GNA kernel driver and various user-space components like OpenVINO.

  • Linux 5.12 Bringing DTPM So You Don't Burn Yourself On Hot Devices - Phoronix

    Linux 5.12 pull requests continue coming in for the newly-opened merge window that in turn should see its stable release in late April.

    Linux power management maintainer Rafael Wysocki of Intel submitted the updates on Monday along with the routine ACPI updates. On the power management front most notable is the introduction of the Dynamic Thermal Power Management (DTPM) framework after missing out on 5.11 landing plus there are a lot of other miscellaneous updates throughout this important area of the kernel with modern devices.

  • Linux 5.12 Crypto Brings AES-NI Acceleration For CTS, Faster XTS With Retpolines - Phoronix

    On Monday the crypto subsystem updates were sent in to the Linux 5.12 kernel by crypto maintainer Herbert Xu.

    This time around there are a few notable crypto updates with this kernel. For systems relying on return trampolines "Retpolines" as part of their Spectre Variant 2 mitigations, Linux 5.12 will offer much faster AES-NI XTS crypto performance. Since Retpolines were added back in 2018, the Retpolines behavior ended up heavily regressing the AES-NI XTS performance that went unnoticed until recently. As a result reworking that kernel code is now yielding a very significant speedup for Retpoline-enabled AMD/Intel systems for hardware needing Retpolines.

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