linux-kernel - Re: [PATCH v5 2/7] x86/microcode: Introduce staging step to reduce late-loading time

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Message-ID: <20250904120810.GJaLmBKtFBh8wke2Bo@fat_crate.local>
Date: Thu, 4 Sep 2025 14:08:10 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Chang S. Bae" <chang.seok.bae@...el.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, dave.hansen@...ux.intel.com, chao.gao@...el.com,
	abusse@...zon.de
Subject: Re: [PATCH v5 2/7] x86/microcode: Introduce staging step to reduce
 late-loading time

On Sat, Aug 23, 2025 at 08:52:05AM -0700, Chang S. Bae wrote:
> As microcode patch sizes continue to grow, late-loading latency spikes
> can lead to timeouts and disruptions in running workloads. This trend of
> increasing patch sizes is expected to continue, so a foundational
> solution is needed to address the issue.
> 
> To mitigate the problem, a new staging feature is introduced. This option
> processes most of the microcode update (excluding activation) on a
> non-critical path, allowing CPUs to remain operational during the
> majority of the update. By offloading work from the critical path,
> staging can significantly reduces latency spikes.

"reduce"

-- 
Regards/Gruss,
    Boris.

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