linux-kernel - Re: [PATCH] x86: add more x86-64 micro-architecture levels

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Message-ID: <96f609c7-f185-49c8-a9d5-a26bfd093b09@gmail.com>
Date: Thu, 19 Sep 2024 01:25:17 +0500
From: Hanabishi <i.r.e.c.c.a.k.u.n+kernel.org@...il.com>
To: John <therealgraysky@...ton.me>
Cc: Borislav Petkov <bp@...en8.de>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Unknown <x86@...nel.org>,
 "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: add more x86-64 micro-architecture levels

On 9/19/24 00:02, John wrote:
> Yes, that is my git repo.

Oops, I didn't realize that.

Even better then! Could you please explain where the performance gains should come from, considering that the kernel force disables all SIMD extensions?
https://github.com/torvalds/linux/blob/4a39ac5b7d62679c07a3e3d12b0f6982377d8a7d/arch/x86/Makefile#L67-L80

I.e. if we won't have them anyway, what gives?