Zombieload V2 TAA Performance Impact Benchmarks On Cascade Lake

While this week we have posted a number of benchmarks on the JCC Erratum and its CPU microcode workaround that introduces new possible performance hits, also being announced this week as part of Intel's security disclosures was "Zombieload Variant Two" as the TSX Async Abort vulnerability that received same-day Linux kernel mitigations. I've been benchmarking the TAA mitigations to the Linux kernel since the moment they hit the public Git tree and here are those initial benchmark results on an Intel Cascade Lake server.

14 November 08:28 AM EST - Software - 13 Comments
Intel's Assembler Changes For JCC Erratum Are Not Hurting AMD

When writing about the Intel Jump Conditional Code (JCC) Erratum and how Intel is working to mitigate the performance hit of the CPU microcode update with patches to the GNU Assembler, there was some concern expressed by readers that it might hurt AMD performance. That does not appear to be the case.

14 November 04:23 AM EST - AMD - JCC Assembler Test - 26 Comments

13 November

The Firefox + Chrome Web Browser Performance Impact From Intel's JCC Erratum Microcode Update

With yesterday's overview and benchmarks of Intel's Jump Conditional Code Erratum one of the areas where the performance impact of the updated CPU microcode exceeding Intel's 0~4% guidance was on the web browser performance. Now with more time having passed, here are more web browser benchmarks on both Chrome and Firefox while comparing the new CPU microcode release for the JCC Erratum compared to the previous release. Simply moving to this new CPU microcode does represent a significant hit to the web browser performance.

13 November 03:19 PM EST - Software - 20 Comments
AMD GCN OpenMP/OpenACC Offloading Patches For The GCC 10 Compiler

Over the past year Code Sourcery / Mentor Graphics has been working extensively on the new AMD Radeon "GCN" back-end for the GCC code compiler. With the code that is found in GCC 9 and up to now in GCC 10 hasn't supported OpenMP/OpenACC parallel programming interfaces but that could soon change with patches under review.

13 November 03:48 AM EST - GNU - OpenMP / OpenACC To AMD GCN - 1 Comment
VirtualBox SF Driver Ejected From The Linux 5.4 Kernel

Merged to the mainline Linux kernel last week was a driver providing VirtualBox guest shared folder support with the driver up to now being out-of-tree but important for sharing files between the host and guest VM(s). While the driver was part of Linux 5.4-rc7, Linus Torvalds decided to delete this driver on Tuesday.

13 November 12:06 AM EST - Virtualization - Shared Folder Support - 14 Comments

12 November

The Gaming Performance Impact From The Intel JCC Erratum Microcode Update

This morning I provided a lengthy look at the performance impact of Intel's JCC Erratum around the CPU microcode update issued for Skylake through Cascade Lake for mitigating potentially unpredictable behavior when jump instructions cross cache lines. Of the many benchmarks shared this morning in that overview, there wasn't time for any gaming tests prior to publishing. Now with more time passed, here is an initial look at how the Linux gaming performance is impacted by the newly-released Intel CPU microcode for this Jump Conditional Code issue.

12 November 07:30 PM EST - Linux Gaming - 13 Comments
Benchmarks Of JCC Erratum: A New Intel CPU Bug With Performance Implications On Skylake Through Cascade Lake

Intel is today making public the Jump Conditional Code (JCC) erratum. This is a bug involving the CPU's Decoded ICache where on Skylake and derived CPUs where unpredictable behavior could happen when jump instructions cross cache lines. Unfortunately addressing this error in software comes with a performance penalty but ultimately Intel engineers are working to offset that through a toolchain update. Here are the exclusive benchmarks out today of the JCC erratum performance impact as well as when trying to recover that performance through the updated GNU Assembler.

12 November 01:00 PM EST - Processors - 39 Comments

11 November

KDE Frameworks 5.64 Released

Sunday marked the release of KDE Frameworks 5.64 as the latest monthly update to this collection of libraries complementing Qt5.

11 November 08:20 PM EST - KDE - KDE Frameworks 5.64 - 6 Comments
SUSE Continues Working On Linux Core Scheduling For Better Security

SUSE and other companies like DigitalOcean have been working on Linux core scheduling to make virtualization safer particularly in light of security vulnerabilities like L1TF and MDS. The core scheduling work is about ensuring different VMs don't share a HT sibling but rather only the same VM / trusted applications run on siblings of a core.

11 November 07:55 AM EST - Virtualization - Core-Scheduling For Virtualization - 3 Comments
Ubuntu 20.04 LTS Continuing To Work On Python 2 Removal

The goal for Ubuntu 20.04 is to ship with Python 2 removed since Py2 will be end-of-life after the start of the year and this next Ubuntu Linux release is a Long-Term Support release, but there still are many Python 2 depending packages left currently in Debian unstable and Ubuntu's "Focal Fossa" archive.

11 November 01:40 AM EST - Ubuntu - Ubuntu 20.04 - Python 3 Only - 38 Comments

Past 30 Days Of News | Articles & Reviews | News Archives | RSS Feed