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.

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.

7 Hours Ago - Hardware - More Benchmarks - 8 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.

15 Hours Ago - X.Org - XDC2019 CfP - 43 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

19 May

The Many Changes & Additions To Find With The Linux 5.2 Kernel

The Linux 5.2 kernel merge window has been open for two weeks now and is expected to close today or in the next few days (there is some uncertainty due to Linus Torvalds traveling this week due to his daughter's graduation). But anyhow all of the major pull requests have already been sent in so here is a look at the new features to find with the Linux 5.2 kernel and the many other changes.

19 May 10:10 AM EDT - Software - 1 Comment

18 May

The Performance Impact Of MDS / Zombieload Plus The Overall Cost Now Of Spectre/Meltdown/L1TF/MDS

The past few days I've begun exploring the performance implications of the new Microarchitectural Data Sampling "MDS" vulnerabilities now known more commonly as Zombieload. As I shared in some initial results, there is a real performance hit to these mitigations. In this article are more MDS/Zombieload mitigation benchmarks on multiple systems as well as comparing the overall performance impact of the Meltdown/Spectre/Foreshadow/Zombieload mitigations on various Intel CPUs and also AMD CPUs where relevant.

18 May 11:30 AM EDT - Software - 56 Comments
The Open-Source / Linux Highlights From OSTS 2019

We've had a number of articles covering the interesting news out of Intel's 2019 Open-Source Technology Summit (OSTS) held at Skamania Lodge in Stevenson, Washington. Here's a look back at the news out of the open-source event as well as some other smaller bits of information shared during the event.

18 May 08:03 AM EDT - Linux Events - Open-Source Technology Summit - 14 Comments

17 May

Developers Start Debating Whether To Block Password-Based Root SSH Logins For Fedora 31

While upstream SSH has disabled password logins for the root user as their default configuration the past number of years and that has carried over into being the out-of-the-box behavior for many operating systems, Fedora continues allowing password-based SSH root log-ins by default. But with the next Fedora release they are thinking about changing that default behavior.

17 May 09:15 AM EDT - Fedora - Fedora 31 SSH Root Logins - 30 Comments
A Push Towards Firmware-less Video Decoding By Linux Kernel Media Drivers

Veteran Linux multimedia developer Paul Kocialkowski summed up the current situation this week of many hardware platforms having a general purpose micro-controller running a non-free firmware blob for coordinating the video decoding work. It makes it easier to program with this firmware-based approach but makes the driver less free and now with recent Linux infrastructure improvements could better support dealing with the video hardware itself.

17 May 07:40 AM EDT - Multimedia - Firmware vs. Registers - 6 Comments

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