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

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Message-ID: <4102be40-7334-4845-b812-8481fbbc62ca@amd.com>
Date: Mon, 17 Nov 2025 09:07:20 -0600
From: Babu Moger <bmoger@....com>
To: Drew Fustini <fustini@...nel.org>, 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)

Hi Drew,

On 11/16/25 11:25, Drew Fustini wrote:
> 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.

Looks like you are on Zen 4 system. ABMC is available on Zen 5 or later 
servers.

#lscpu
Vendor ID:                AuthenticAMD
Model name:            AMD EPYC 9655 96-Core Processor
CPU family:              26

Thanks for trying.

-Babu Moger