linux-kernel - RE: [PATCH v13 00/32] x86,fs/resctrl telemetry monitoring

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Message-ID: <SJ1PR11MB6083B1C8D6D9EF5B44AFE2DCFCC9A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Mon, 17 Nov 2025 16:52:09 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Drew Fustini <pdp7pdp7@...il.com>
CC: Fenghua Yu <fenghuay@...dia.com>, "Chatre, Reinette"
	<reinette.chatre@...el.com>, "Wieczor-Retman, Maciej"
	<maciej.wieczor-retman@...el.com>, Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>, Babu Moger <babu.moger@....com>, "Drew
 Fustini" <dfustini@...libre.com>, Dave Martin <Dave.Martin@....com>, "Chen,
 Yu C" <yu.c.chen@...el.com>, "x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v13 00/32] x86,fs/resctrl telemetry monitoring

> > On Intel systems that support per-RMID telemetry monitoring each logical
> > processor keeps a local count for various events. When the
> > MSR_IA32_PQR_ASSOC.RMID value for the logical processor changes (or when a
> > two millisecond counter expires) these event counts are transmitted to
> > an event aggregator on the same package as the processor together with
> > the current RMID value. The event counters are reset to zero to begin
> > counting again.
>
> Do you have any suggestion of which Xeon parts I should be looking for
> if I want to try out this feature?
>
> I'm looking at bare metal hosting providers for an Intel server that I
> can try out features like SNC and this. I look up the parts on ARK but
> it shows yes/no for RDT which is not very specific. I'm hoping to do
> something better than just hoping cpuinfo has what I want once the
> machine is provisioned :)
>

Drew,

Telemetry monitoring based on RMIDs is only present on Clearwater Forest
systems today. Those haven't been released into the wild yet.

-Tony