I'm really "new" to x64 (I only migrated from 32-bit in 2020...) and the difference I noticed between x86-64-v1 and x86-64-v3 was only with video (with ffmpeg), audio (mp3/ogg/mp4...) and encryption; the rest remains practically the same.
Naively, I believe it might be more appropriate to have x86-64-v1 and x86-64-vN options only for specific software and leave the rest as x86-64-v1.
AVX seemed to give the biggest boost to things.
Regarding those who are making fun of Gentoo users, it really did make a bigger difference in the past, but with the refinement of compilers, the difference has diminished. Today, for me, who still uses Gentoo/CRUX for some specific tasks, what matters is the flexibility to enable or disable what I want in the software, and not so much the extra speed anymore.
As an example, currently I use -Os (x86-64-v1) for everything, and only for things related to video/sound/cryptography (I believe for things related to mathematics in general?) I use -O2 (x86-64-v3) with other flags to get a little more out of it.
Interestingly, in many cases -Os with -mtune=nocona generates faster binaries even though I'm only using hardware from Haswell to today's hardware (who can understand the reason for this?).
Naively, I believe it might be more appropriate to have x86-64-v1 and x86-64-vN options only for specific software and leave the rest as x86-64-v1.
AVX seemed to give the biggest boost to things.
Regarding those who are making fun of Gentoo users, it really did make a bigger difference in the past, but with the refinement of compilers, the difference has diminished. Today, for me, who still uses Gentoo/CRUX for some specific tasks, what matters is the flexibility to enable or disable what I want in the software, and not so much the extra speed anymore.
As an example, currently I use -Os (x86-64-v1) for everything, and only for things related to video/sound/cryptography (I believe for things related to mathematics in general?) I use -O2 (x86-64-v3) with other flags to get a little more out of it.
Interestingly, in many cases -Os with -mtune=nocona generates faster binaries even though I'm only using hardware from Haswell to today's hardware (who can understand the reason for this?).