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.

Source: Phoronix – Zombieload V2 TAA Performance Impact Benchmarks On Cascade Lake

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…

Source: Phoronix – Intel’s Assembler Changes For JCC Erratum Are Not Hurting AMD

CodeWeavers Is Hiring Another Graphics Developer To Help With Wine D3D / Steam Play

CodeWeavers is looking to hire another developer to work on Wine’s graphics stack and in particular the WineD3D code while having an emphasis that it’s part of Valve’s Steam Play (Proton) efforts…

Source: Phoronix – CodeWeavers Is Hiring Another Graphics Developer To Help With Wine D3D / Steam Play

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.

Source: Phoronix – The Firefox + Chrome Web Browser Performance Impact From Intel’s JCC Erratum Microcode Update

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…

Source: Phoronix – AMD GCN OpenMP/OpenACC Offloading Patches For The GCC 10 Compiler

GNU Assembler Patches Sent Out For Optimizing The Intel Jump Conditional Code Erratum

Now that Intel lifted its embargo on the “Jump Conditional Code” erratum affecting Skylake through Cascade Lake processors, while Intel’s own Clear Linux was first to carry these patches they have now been sent out on the Binutils mailing list for trying to get the JCC optimization patches into the upstream Binutils/GAS code-base…

Source: Phoronix – GNU Assembler Patches Sent Out For Optimizing The Intel Jump Conditional Code Erratum

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…

Source: Phoronix – VirtualBox SF Driver Ejected From The Linux 5.4 Kernel

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.

Source: Phoronix – The Gaming Performance Impact From The Intel JCC Erratum Microcode Update

Intel's Linux Graphics Driver Updated For Denial Of Service + Privilege Escalation Bugs

Of the 77 security advisories Intel is making public and the three big ones of the performance-sensitive JCC Erratum, the new ZombieLoad TAA (TSX Asynchronous Abort), and iTLB Multihit No eXcuses, there are also two fixes to their kernel graphics driver around security issues separate from the CPU woes…

Source: Phoronix – Intel’s Linux Graphics Driver Updated For Denial Of Service + Privilege Escalation Bugs

Linux Kernel Gets Mitigations For TSX Async Abort Plus Another New Issue: iITLB Multihit

The Linux kernel has just received its mitigation work for the newly-announced TSX Asynchronous Abort (TAA) variant of ZombieLoad plus revealing mitigations for another Intel CPU issue… So today in addition to the JCC Erratum and ZombieLoad TAA the latest is iITLB Multihit (NX) – No eXcuses…

Source: Phoronix – Linux Kernel Gets Mitigations For TSX Async Abort Plus Another New Issue: iITLB Multihit

New ZombieLoad Side-Channel Attack Variant: TSX Asynchronous Abort

In addition to the JCC erratum being made public today and that performance-shifting Intel microcode update affecting Skylake through Cascade Lake, researchers also announced a new ZombieLoad side-channel attack variant dubbed “TSX Asynchronous Abort” or TAA for short…

Source: Phoronix – New ZombieLoad Side-Channel Attack Variant: TSX Asynchronous Abort