this post was submitted on 12 Dec 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It seems multiple Linux distributions are considering to update their x86-64 baseline architecture. This could improve performance, at the cost of hardware compatibility.
https://discourse.nixos.org/t/pre-rfc-gradual-transition-of-nixos-x86-64-baseline-to-x86-64-v3-with-an-intermediate-step-to-x86-64-v2/
Gentoo with
-march=native -mtune=nativeon x86(-64) or-mcpu=nativeeverywhere elseDoesn’t march=native imply mtune=native ?
No. march is avaliable instructions and mtune is timings. mcpu does, but it is not used on x86 for some reason
march=native does imply mtune=native, at least on gcc