linux-kernel - Re: [PATCH] RAS/CEC: Reduce default threshold to offline a page to "2"

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Date:   Mon, 27 Jun 2022 16:40:26 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tony Luck <tony.luck@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH] RAS/CEC: Reduce default threshold to offline a page to
 "2"

On Tue, Jun 07, 2022 at 02:20:15PM -0700, Tony Luck wrote:
> A large scale study of memory errors in data centers showed that it is
> best to aggressively take pages with corrected errors offline. This is
> the best strategy of using corrected errors as a predictor of future
> uncorrected errors.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> 
> ---
> Here's the link to the study. I thought of putting into the code
> comment, or the commit comment. But these links are sometimes changed
> as website is re-organised, making the link stale.
> 
> https://www.intel.com/content/dam/www/public/us/en/documents/intel-and-samsung-mrt-improving-memory-reliability-at-data-centers.pdf
> 
> The paper has two recommendations:
> 1) Change threshold to "2".

Kinda unconditional that... we haven't talked to other vendors even.

> 2) Do very smart platform dependent things

If you mean AI, that probably won't happen in the kernel.

-- 
Regards/Gruss,
    Boris.

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