linux-kernel - Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR accesses on AMD

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Message-ID: <CAL2Jzuxygf+kp0b9y5c+SY7xQEp7j24zNuKqaTAOUGHZrmWROw@mail.gmail.com>
Date: Fri, 29 Nov 2024 10:30:11 +0100
From: Erwan Velu <erwanaliasr1@...il.com>
To: Sasha Levin <sashal@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com, 
	x86@...nel.org, puwen@...on.cn, seanjc@...gle.com, kim.phillips@....com, 
	jmattson@...gle.com, babu.moger@....com, peterz@...radead.org, 
	rick.p.edgecombe@...el.com, brgerst@...il.com, ashok.raj@...el.com, 
	mjguzik@...il.com, jpoimboe@...nel.org, nik.borisov@...e.com, aik@....com, 
	vegard.nossum@...cle.com, daniel.sneddon@...ux.intel.com, acdunlap@...gle.com, 
	pavel@...x.de
Subject: Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR
 accesses on AMD

[...]
> The stable kernel rules allow for "notable" performance fixes, and we
> already added it to 6.6. No objection to adding it to older kernels...
> Happy to do it after the current round of releases goes out.
Sacha,
Thanks for considering the backport of this patch, much appreciated.
This patch greatly impacts servers on production with AMD systems that
have lasted since 5.11, having it backported really improves systems
performance.
Since this patch, I can share that our database team is no longer
paged during the night, that's a real noticeable impact.

We all know how difficult it is to maintain kernels and support the
hard work you do on this.
It's also up to us, the users & industry, to give feedback and testing
around this type of story.
It could probably be interesting to have a presentation around this at
KernelRecipes ;)
Erwan,