linux-kernel - Re: [PATCH v21 07/18] x86/resctrl: Block use of mba_MBps mount option on Sub-NUMA Cluster (SNC) systems

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Date: Tue, 25 Jun 2024 16:28:48 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...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>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v21 07/18] x86/resctrl: Block use of mba_MBps mount option
 on Sub-NUMA Cluster (SNC) systems

Hi Tony,

On 6/21/24 3:38 PM, Tony Luck wrote:
> When SNC is enabled there is a mismatch between the MBA control function
> which operates at L3 cache scope and the MBM monitor functions which
> measure memory bandwidth on each SNC node.
> 
> Block use of the mba_MBps when scopes for MBA/MBM do not match.
> 
> Improve user diagnostics by adding invalfc() message when mba_MBps
> is not supported.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette