linux-kernel - Re: [PATCH v18 00/33] x86,fs/resctrl: Support AMD Assignable Bandwidth Monitoring Counters (ABMC)

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Message-ID: <aRoJAbfn+oBkc/sb@x1>
Date: Sun, 16 Nov 2025 09:25:21 -0800
From: Drew Fustini <fustini@...nel.org>
To: Babu Moger <babu.moger@....com>
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Subject: Re: [PATCH v18 00/33] x86,fs/resctrl: Support AMD Assignable
 Bandwidth Monitoring Counters (ABMC)

On Fri, Sep 05, 2025 at 04:33:59PM -0500, Babu Moger wrote:
> 
> This series adds the support for Assignable Bandwidth Monitoring Counters
> (ABMC). It is also called QoS RMID Pinning feature.
> 
> Series is written such that it is easier to support other assignable
> features supported from different vendors.

Is there a way to find out which EPYC parts support ABMC?

I'm rebasing the RISC-V resctrl support on 6.18 and I noticed there are
a lot of changes to how events work. I've been reading the ABMC code
but I would like to get a better feel for how it works.

I found an EPYC 9124P on Cherry Servers which I was able to experiment
with using resctrl on x86. It has the following in cpuinfo:

cat_l3 cdp_l3 cqm cqm_llc cqm_mbm_local cqm_mbm_total cqm_occup_llc mba

It also has SMBA and BMEC based on the contents of /sys/fs/resctrl.

Ideally, I'd like to find a bare metal EPYC server that has ABMC, too.

Thanks,
Drew