Docker Performance With KPTI Page Table Isolation Patches

Overall most of our benchmarks this week of the new Linux Kernel Page Table Isolation (KPTI) patches coming as a result of the Meltdown vulnerability have showed minimal impact overall on system performance. The exceptions have obviously been with workloads having high kernel interactions like demanding I/O cases and in terms of real-world impact, databases. But when testing VMs there's been some minor impact more broadly than bare metal testing and also Wine performance has been impacted. The latest having been benchmarked is seeing if the Docker performance has been impacted by the KPTI patches to see if it's any significant impact since overall the patched system overhead certainly isn't anything close to how it was initially hyped by some other media outlets.

UBports Is Making Progress With Unity 8 On The Desktop

While it's approaching one year since Canonical decided to divest from Unity 8 and mobile/convergence, the UBports community continues making some progress in getting their forked desktop environment ready for their forked Ubuntu Touch environment as well as the desktop.

13 Hours Ago - Ubuntu - Unity 8 - 14 Comments
AMD Did NOT Disable Branch Prediction With A Zen Microcode Update

With the plethora of software security updates coming out over the past few days in the wake of the Meltdown and Spectre disclosure, released by SUSE was a Family 17h "Zen" CPU microcode update that we have yet to see elsewhere... It claims to disables branch prediction, but I've confirmed with AMD that is not actually the case.

13 Hours Ago - AMD - Branch Prediction - 22 Comments

5 January

Ubuntu 17.10 To Be Re-Released Next Week

Last month Ubuntu 17.10 ISOs were pulled due to a BIOS/UEFI corrupting problem. They got the problem under control by the end of December and there is a software fix available for affected laptops, particularly a number of Lenovo laptops and those from a few other vendors. Next week a fixed Ubuntu 17.10 release is now expected.

5 January 07:53 PM EST - Ubuntu - Ubuntu 17.10 Re-Spun - 10 Comments
DragonFlyBSD Lands Fixes For Meltdown Vulnerability

Linux, macOS, and Windows has taken most of the operating system attention when it comes down to the recently-disclosed Meltdown vulnerability but the BSDs too are prone to this CPU issue. DragonFlyBSD lead developer Matthew Dillon has landed his fixes for Meltdown.

5 January 01:44 PM EST - BSD - DragonFly Meltdown - 7 Comments
Fedora 28 Taking To Modularizing Their Anaconda Installer

When talking about the Fedora/RedHat Anaconda installer it still brings back bad memories from the Anaconda fallout a few years ago when they went through some painful transitions that also led to release delays. In 2018, Fedora/RedHat developers are taking up the initiative of modularizing the Anaconda installer.

5 January 10:59 AM EST - Fedora - Modular Installer - 5 Comments

4 January

Linux KPTI Tests Using Linux 4.14 vs. 4.9 vs. 4.4

Yet another one of the avenues we have been exploring with our Linux Page Table Isolation (KPTI) testing has been looking at any impact of this security feature in the wake of the Meltdown vulnerability when testing with an older Linux Long Term Support (LTS) release. In particular, when using a kernel prior to the PCID (Process Context Identifier) support in the Linux kernel that is used to lessen the impact of KPTI.

4 January 08:31 PM EST - Software - 29 Comments
NVIDIA Gaming Performance Minimally Impacted By KPTI Patches

Earlier this week when news was still emerging on the "Intel CPU bug" now known as Spectre and Meltdown I ran some Radeon gaming tests with the preliminary Linux kernel patches providing Kernel Page Table Isolation (KPTI) support. Contrary to the hysteria, the gaming performance was minimally impacted with those open-source Radeon driver tests while today are some tests using the latest NVIDIA driver paired with a KPTI-enabled kernel.

4 January 12:57 PM EST - Linux Gaming - 7 Comments

3 January

2 January

For Now At Least AMD CPUs Are Also Reported As "Insecure"

Right now with the big mysterious security vulnerability causing the rush of the x86 Page Table Isolation work that landed in the Linux kernel days ago, it's believed to be a problem only affecting Intel CPUs. But at least for now the mainline kernel is still treating AMD CPUs as "insecure" and is too taking a performance hit.

2 January 09:16 PM EST - AMD - x86 PTI On EPYC - 70 Comments
Initial Benchmarks Of The Performance Impact Resulting From Linux's x86 Security Changes

Over the past day you've likely heard lots of hysteria about a yet-to-be-fully-disclosed vulnerability that appears to affect at least several generations of Intel CPUs and affects not only Linux but also Windows and macOS. The Intel CPU issue comes down to leaking information about the kernel memory to user-space, but the full scope isn't public yet until the bug's embargo, but it's expected to be a doozy in the data center / cloud deployments. Due to the amount of interest in this issue, here are benchmarks of a patched kernel showing the performance impact of the page table isolation patches.

2 January 06:35 PM EST - Software - Add A Comment
LLVM Clang 6.0 Benchmarks On AMD's EPYC Yield Some Performance Benefits

With LLVM 6.0 being branched this week and that marking the end of feature development on this next compiler update before its stable debut in February, here are some benchmarks of the very latest LLVM Clang 6.0 compiler on AMD's EPYC 7601 32-core / 64-thread processor as we see how well the AMD Zen "znver1" tuning is working out.

2 January 08:29 AM EST - Software - 3 Comments
Even With An Intel Core i9 7980XE, LLVMpipe Is Still Slow

During the recent holidays when running light on benchmarks to run, I was toying around with LLVMpipe in not having run this LLVM-accelerated software rasterizer in some time. I also ran some fresh tests of Intel's OpenSWR OpenGL software rasterizer that has also been living within Mesa.

2 January 06:18 AM EST - Mesa - i9-7980XE - 8 Comments

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