Open-source News

The "What If" Performance Cost To Kernel Page Table Isolation On AMD CPUs

Phoronix - Fri, 10/15/2021 - 08:45
Made public this week by CPU security researchers at Graz University of Technology and CISPA Helmholtz Center for Information Security was the research paper published "AMD Prefetch Attacks through Power and Time". The paper points to AMD CPUs suffering from a side-channel leakage vulnerability through timing and power variations of the PREFETCH instruction. The paper argues that AMD CPUs should activate stronger page table isolation by default. AMD has now published their security response where they are not recommending any mitigation changes at this time. But what if Kernel Page Table Isolation (KPTI/PTI) proves necessary for AMD CPUs? Here are some initial benchmarks showing what that performance impact could look like.

X.Org Server 21.1 RC2 Brings Fix For Mixed VRR/Non-VRR Multi-Monitor Setups

Phoronix - Fri, 10/15/2021 - 03:36
X.Org Server 21.1 continues running slightly behind schedule but out today is a second release candidate of that upcoming xorg-server version -- the first in more than three years...

Devuan 4.0 Released As Debian 11 Without Systemd

Phoronix - Fri, 10/15/2021 - 01:46
Devuan 4.0 "Chimaera" is officially out today as the latest stable release of this Linux distribution known for being a close rebuild of Debian but without a dependence on systemd...

Ubuntu 21.10 Released With GNOME 40 Desktop, Many Underlying Improvements

Phoronix - Thu, 10/14/2021 - 22:53
Ubuntu 21.10 "Impish Indri" is now officially available as the latest six-month update to Ubuntu Linux and also serving as the last release prior to the next long-term support cycle, Ubuntu 22.04 LTS...

NVIDIA 495 Linux Beta Driver Released With GBM Support

Phoronix - Thu, 10/14/2021 - 21:36
NVIDIA 495.29.05 is out today as the first public Linux driver in the 495 series...

OpenBSD 7.0 Released With RISC-V 64-bit Port, Better Apple Silicon Support

Phoronix - Thu, 10/14/2021 - 21:00
Not only is Ubuntu 21.10 releasing today but over on the BSD side of the table is the debut this morning of OpenBSD 7.0...

9-Way H2'2021 Linux OS Performance Comparison On Intel Xeon Scalable Ice Lake

Phoronix - Thu, 10/14/2021 - 20:30
While we recently looked at autumn 2021 Linux distributions on Intel Tiger Lake for seeing how these various latest distributions are competing on client platforms, in today's article is a look at how well the latest Linux distributions perform when using the latest-generation Intel Xeon Scalable 3rd Gen "Ice Lake" server hardware with two Xeon Platinum 8380 processors. AlmaLinux, Arch Linux, CentOS Stream, Clear Linux, Debian, Fedora, openSUSE, and Ubuntu were battling it out on this Intel reference server.

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