GNU Binutils Begins Landing eBPF Support

The GNU Binutils is finally getting wired up around the Extended BPF (eBPF) as the modern, in-kernel virtual machine that stretches the Berkeley Packet Filter beyond the networking subsystem.

5 Hours Ago - GNU - Binutils + eBPF - 2 Comments

23 May

ZombieLoad Mitigation Costs For Intel Haswell Xeon, Plus Overall Mitigation Impact

With tests over the past week following the disclosure of the Microarchitectural Data Sampling (MDS) vulnerabilities also known as "Zombieload", we've looked at the MDS mitigation costs (and now the overall Spectre/Meltdown/L1TF/MDS impact) for desktop CPUs, servers, and some laptop hardware. I've also begun doing some tests on older hardware, such as some Phoronix readers curious how well aging Intel Haswell CPUs are affected.

23 May 01:07 PM EDT - Linux Security - Haswell Xeon - 4 Comments
AMD GCN GPU Target Continuing To Improve For The GCC 10 Compiler

With the recent release of the GCC 9 stable compiler there is the initial "AMD GCN" GPU target/back-end merged. However, for this GNU Compiler Collection release the AMD GCN target isn't all that useful but continued work on it gives us hope of seeing it in good shape for next year's GCC 10 release.

23 May 09:28 AM EDT - AMD - AMD GCN - Add A Comment

22 May

OpenSUSE Adds Option To Installer For Toggling Performance-Hitting CPU Mitigations

With the newly released openSUSE Leap 15.1 they have added an option to their installer for toggling the CPU mitigations around Spectre / Meltdown / Foreshadow / Zombieload to make it very convenient should you choose to retain maximum performance while foregoing the security measures. But it also allows disabling SMT/HT from the installer should you prefer maximum security.

22 May 07:28 PM EDT - SUSE - Spectre / Meltdown / L1TF / MDS - 24 Comments
AMD Radeon VII Linux Performance vs. NVIDIA Gaming On Ubuntu For Q2'2019

It's been three months now since the AMD Radeon VII 7nm "Vega 20" graphics card was released and while we hopefully won't be waiting much longer for Navi to make its debut, for the time being this is the latest and great AMD Radeon consumer graphics card -- priced at around $700 USD. Here are some fresh benchmarks of the Radeon VII on Linux and compared to various high-end NVIDIA graphics cards while all testing happened from Ubuntu 19.04.

22 May 12:15 PM EDT - Graphics Cards - 21 Comments
An Early Look At Some PHP 7.4 Performance Benchmarks

The initial PHP 7.4 Alpha 1 release is just two weeks away already... Curious about the performance of this yearly update to PHP7, I ran some benchmarks on the latest development code as of this morning compared to the earlier PHP7 releases and even PHP-8.0 that is in development on Git master.

22 May 10:59 AM EDT - Programming - PHP 7.4 Benchmarks - 3 Comments
Intel Icelake Brings New Top-Down Performance Counters

While the Linux support for Intel's long awaited Icelake support has been out there for months and all fundamentals seemingly mature, there have been a few last-minute additions around some non-essential functionality. One of the latest Linux kernel patch series around Icelake is adding support for new Top-Down performance counters for these next-generation Intel processors.

22 May 07:09 AM EDT - Intel - Icelake Top-Down - Add A Comment
Intel Iris Gallium3D Driver Gets On-Disk Shader Cache Support

In helping to speed-up game load times when switching to the new Intel "Iris" Gallium3D OpenGL Linux driver and smooth out frame-rates for games sporadically loading shaders, Mesa 19.2-devel has added on-disk shader cache support for the driver.

22 May 12:07 AM EDT - Intel - Intel Gallium3D Shader Cache - 1 Comment

21 May

systemd Clocks In At More Than 1.2 Million Lines

Five years ago today was the story on Phoronix how the systemd source tree was approaching 550k lines so curiosity got the best of me to see how large is the systemd Git repository today. Well, now it's over 1.2 million lines.

21 May 07:30 PM EDT - systemd - Systemd Size - 111 Comments
Red Hat Enterprise Linux 8.0 Benchmarks On AMD EPYC - Big Speed-Ups Over RHEL7

Since the release of Red Hat Enterprise Linux 8.0 at the start of May we've been running various benchmarks of this latest enterprise Linux platform. Our tests to date have been with Intel Xeon hardware where it's been performing well and a nice speed-up over RHEL 7 with modern Xeon Scalable CPUs. Similarly, AMD EPYC is also much faster with RHEL 8.0 thanks to the much newer Linux kernel, compiler, and other software updates.

21 May 10:15 AM EDT - Operating Systems - 10 Comments
Raspberry Pi Close To Seeing CPUFreq Support

Nicolas Saenz Julienne of SUSE has been working on CPUFreq support for the Raspberry Pi single board computers to allow for the Linux kernel to provide CPU frequency scaling controls.

21 May 08:55 AM EDT - Arm - Raspberry Pi CPUFREQ - 26 Comments
Spectre/Meltdown/L1TF/MDS Mitigation Costs On An Intel Dual Core + HT Laptop

Following the recent desktop CPU benchmarks and server CPU benchmarks following the MDS/ZombieLoad mitigations coming to light and looking at the overall performance cost to mitigating these current CPU vulnerabilities, there was some speculation by some in the community that the older dual-core CPUs with Hyper Threading would be particularly hard hit. Here are some benchmarks of a Lenovo ThinkPad with Core i7 Broadwell CPU looking at those mitigation costs.

21 May 08:19 AM EDT - Hardware - More Benchmarks - 21 Comments
X.Org's XDC2019 Issues Call For Proposals On Wayland, Mesa, X.Org, Etc

X.Org's annual event, the X.Org Developers' Conference, is running like a well-oiled machined these days. While there are still months to go until XDC2019 in Montreal, a Call for Proposals has been issued for those wishing to speak at this annual gathering that pertains to Wayland, Mesa, libinput, Cairo, and related components as well, yes, the X.Org Server.

21 May 12:02 AM EDT - X.Org - XDC2019 CfP - 51 Comments

20 May

Ubuntu Expands Its Kernel Uploader Team

As a sign of the times with the Linux kernel being affected by an increasing number of CVEs (and particularly high profile ones at that), there are now more Ubuntu developers with upload rights for sending down new kernel upgrades.

20 May 03:49 PM EDT - Ubuntu - Ubuntu Kernel Team - 6 Comments
A Look At The MDS Cost On Xeon, EPYC & Xeon Total Impact Of Affected CPU Vulnerabilities

This weekend I posted a number of benchmarks looking at the performance impact of the new MDS/Zombieload vulnerabilities that also included a look at the overall cost of Spectre/Meltdown/L1TF/MDS on Intel desktop CPUs and AMD CPUs (Spectre). In this article are similar benchmarks but turning the attention now to Intel Xeon hardware and also comparing those total mitigation costs against AMD EPYC with its Spectre mitigations.

20 May 12:48 PM EDT - Software - 15 Comments
RadeonSI Primitive Culling Lands In Mesa 19.2

The past few months AMD's Marek Olšák has been working on primitive culling support for the RadeonSI Gallium3D driver and last week that code was merged into the Mesa 19.2 development code.

20 May 08:19 AM EDT - Mesa - Primitive Culling - 26 Comments

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