linux-kernel - Re: [PATCH] x86/tsc: Add debugfs entry to mark TSC as unstable after boot

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Message-ID: <20250323195102.GDZ-BmJgDWLieuUaJs@fat_crate.local>
Date: Sun, 23 Mar 2025 20:51:02 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
	dave.hansen@...ux.intel.com, kernel@...ccoli.net,
	kernel-dev@...lia.com
Subject: Re: [PATCH] x86/tsc: Add debugfs entry to mark TSC as unstable after
 boot

On Sun, Mar 23, 2025 at 04:21:44PM -0300, Guilherme G. Piccoli wrote:
> This is great to hear - is there any starting point model that you know
> AMD introduced/is introducing TSC_ADJUST?

Zen5.

> We don't know yet what's going on, some TSC skews reported eventually in
> some machines, in a fleet - but "old" processors, Zen 1st gen.  Once things
> are more clear, definitely could provide a more mature report of the issue.

Sure.

Zen1 should not have TSC problems either. If it does, whack BIOS people.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette