Warn once about it, and let the crazy people say “I’d rather take a 50% performance hit than worry about a theoretical issue”. This link was helpful: /Kernel/Support It gives major and point releases, their kernel version and support schedule, for fairly modern releases. I think we should use the same logic as for L1TF: we default to something that doesn’t kill performance. 1 I landed here looking for kernel versions in point releases, which wasn't in the answers below. Linux kernel release 4.x < The kernel’s command-line parameters Linux allocated devices (4.x+ version) L1TF - L1 Terminal Fault Reporting bugs Security bugs Bug hunting Bisecting a bug Tainted kernels Ramoops oops/panic logger Dynamic debug Explaining the dreaded No init found.
So why do that STIBP slow-down by default when the people who *really* care already disabled SMT? It’s apparently better to just disable SMT entirely, which is what security-conscious people do anyway. When performance goes down by 50% on some loads, people need to start asking themselves whether it was worth it. New: PowerPC fixes 4.20-3 Linux 4.20-rc3 Kernel Released - Torvalds release message.
LINUX KERNEL 4.20 CODE
Fossa 5.4 20.10 Groovy Gorilla 5.8 21.04 Hirsute Hippo 5.11. I released the RC3 of kernel 4.20 for testing today. Summary: This release includes support for a new way to measure the system load it adds support for future AMD Radeon Picasso and Raven2 and enables non-experimental support for Radeon Vega20 it adds support for the C-SKY CPU architecture and the x86 Hygon Dhyana CPUs a TLB microoptimization brings a small performance win in some workloads T. The Linux kernel will be ending 2018 on a high note with this kernel bringing more than 350 thousand lines of new code This kernel began its life two weeks ago not knowing whether it would be called Linux 4.20 or Linux 5.0. This was marked for stable, and honestly, nowhere in the discussion did I see any mention of just *how* bad the performance impact of this was. I would specifically like to know the most recent version of Ubuntu that still used Linux Kernel 2.x. Linus Torvalds was surprised by the fact that he said on the mailing list that he did not see any words that would affect performance in the discussion list. When performance drops by 50% under certain loads, you should first ask if it is worthwhile, not regardless. The main change in 4.20 is that STIBP is enabled by default for Intel-supported Hyper-Threading processors to prevent cross-thread control of indirect branch predictors. Phoronix recently found that on almost all low-end, high-end Intel processors, the latest beta kernel, Linux Kernel 4.20, has a significant performance degradation over the latest stable version 4.19, while AMD’s processors are not affected. The reason for the performance degradation is related to Intel processor vulnerability patching. Linus released Kernel 4.20 yesterday with the following message: Let's face it, last week wasn't quite as quiet as I would have hoped for, but there really doesn't seem to be any point to delay 4.20 because everybody is already taking a break.
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