linux-kernel - Re: [PATCH 1/2] x86/CPU/AMD: Present package as die instead of socket

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Date:   Wed, 5 Jul 2017 17:50:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:     Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, leo.duran@....com,
        yazen.ghannam@....com
Subject: Re: [PATCH 1/2] x86/CPU/AMD: Present package as die instead of socket

On Tue, Jun 27, 2017 at 08:07:10PM +0700, Suravee Suthikulpanit wrote:

> As I have described in the cover letter, this patch series changes how

Which you didn't send to me... thanks for that.

> kernel derives cpu "package" from package-as-socket to package-as-die in
> order to fix following issues on AMD family17h multi-die processor
> platforms:

> These issues are fixed when properly intepretes package as DIE.
> 
> For MCM Magny-Cours (family15h), we do not have this issue because the MC
> sched-domain has the same cpumask as the DIE sched-domain. This is not the
> same as for Zen cores (family17h) where the MC sched-domain is the CCX (2
> CCX per die)

Are you saying that your LLCs are smaller than your NUMA nodes ? You do
not in fact have a cache level that spans the memory controller?

Because that is indeed the assumption we have for Intel CoD/SnC and AMD
Magny-Cours.