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

From: Reinette Chatre
Date: Tue Jun 25 2024 - 19:29:08 EST


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

Reinette