linux-kernel - Re: [PATCH v3] x86/resctrl: mba_MBps: Fall back to total b/w if local b/w unavailable

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Message-ID: <0b580b8d-415f-4e5c-b042-1b66496de186@intel.com>
Date:   Fri, 3 Nov 2023 14:50:23 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        "Peter Newman" <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <skhan@...uxfoundation.org>, <x86@...nel.org>
CC:     Shaopeng Tan <tan.shaopeng@...itsu.com>,
        James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <patches@...ts.linux.dev>
Subject: Re: [PATCH v3] x86/resctrl: mba_MBps: Fall back to total b/w if local
 b/w unavailable



On 11/3/2023 2:43 PM, Reinette Chatre wrote:
> On 10/26/2023 1:02 PM, Tony Luck wrote:
>> On Intel the various resource director technology (RDT) features are all
>> orthogonal and independently enumerated. Thus it is possible to have
>> a system that  provides "total" memory bandwidth measurements without
>> providing "local" bandwidth measurements.
> 
> This motivation is written in support of Intel systems but from what I
> can tell the changes impact Intel as well as AMD.

No wait. Sorry. AMD does not enable delay_linear.

Reinette