Warn once about it, and let the crazy people say “I’d rather take a 50% performance hit than worry about a theoretical issue”. The developer needs to create a new package for linux kernel 4.20. I think we should use the same logic as for L1TF: we default to something that doesn’t kill performance. So why do that STIBP slow-down by default when the people who *really* care already disabled SMT? In the end, he stuck with 4.20, and 5.0 will probably be the number of the next kernel after this one. There was speculation whether Torvalds would make the jump from 4.19 to 5.0, as he did when he skipped 3.20 and went with 4.0 instead. Today we will talk about what was implemented in 4.20, and we will conduct. Linus Torvalds unleashed kernel 4.20, dubbed Shy Crocodile, on the world this past Sunday. This link was helpful: /Kernel/Support It gives major and point releases, their kernel version and support schedule, for fairly modern releases. We have already talked about the innovations that were made in Linux kernel 4.18.
Linux kernel 4.20 code#
It’s apparently better to just disable SMT entirely, which is what security-conscious people do anyway. 1 I landed here looking for kernel versions in point releases, which wasn't in the answers below. 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. When performance goes down by 50% on some loads, people need to start asking themselves whether it was worth it. This site is operated by the Linux Kernel Organization, Inc., a 501(c)3 nonprofit corporation, with support from the following sponsors. shortlog below is a bit longer than I would have wished for.
Linux kernel 4.20 free#
The Linux kernel is a free and open-source, monolithic, Unix-like operating system kernel. And it's not like there are any known issues, it's just that the. This article documents the version history of the Linux kernel. because everybody is already taking a break. for, but there really doesn't seem to be any point to delay 4.20. 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. Let's face it, last week wasn't quite as quiet as I would have hoped.
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.
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