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

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Message-ID: <aRoLSz6or2UK4tDu@x1>
Date: Sun, 16 Nov 2025 09:35:07 -0800
From: Drew Fustini <pdp7pdp7@...il.com>
To: Tony Luck <tony.luck@...el.com>
Cc: Fenghua Yu <fenghuay@...dia.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <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 <yu.c.chen@...el.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev
Subject: Re: [PATCH v13 00/32] x86,fs/resctrl telemetry monitoring

On Wed, Oct 29, 2025 at 09:20:43AM -0700, Tony Luck wrote:
> Patches based on v6.18-rc3
[snip]
> 
> Background
> ----------
> 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 :)

Thanks,
Drew