linux-kernel - RE: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages

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Date: Mon, 18 Mar 2024 22:04:47 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Chatre, Reinette" <reinette.chatre@...el.com>, James Morse
	<james.morse@....com>, "'peternewman@...gle.com'" <peternewman@...gle.com>
CC: "Wieczor-Retman, Maciej" <maciej.wieczor-retman@...el.com>, "Yu, Fenghua"
	<fenghua.yu@...el.com>, Shuah Khan <shuah@...nel.org>,
	"ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: RE: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages

> Could you please help me understand the details by answering my first
> question: What is the use case for needing to expose the individual cluster
> counts? 
>
> This is a model specific feature so if this is something needed for just a
> couple of systems I think we should be less inclined to make changes to
> resctrl interface. I am starting to be concerned about something similar
> becoming architectural later and then we need to wrangle this model specific
> resctrl support (which has then become ABI) again to support whatever that
> may look like.

Reinette,

Model specific. But present in multiple consecutive generations (Sapphire Rapids,
Emerald Rapids, Granite Rapids, Sierra Forest).

Adding Peter Newman for a resctrl user perspective on SNC, rather than me
continue to speculate on possible ways this might be used.

Peter: You will need to dig back a few messages on lore.kernel.org to
get context.

-Tony