linux-kernel - Re: [PATCH v8 0/2] selftests/resctrl: SNC kernel support discovery

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Message-ID: <808036fb-9a2c-44c3-ac6c-5406313a232a@intel.com>
Date: Thu, 19 Dec 2024 10:35:14 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	<fenghua.yu@...el.com>, <shuah@...nel.org>
CC: <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<ilpo.jarvinen@...ux.intel.com>, <tony.luck@...el.com>
Subject: Re: [PATCH v8 0/2] selftests/resctrl: SNC kernel support discovery

Hi Shuah,

On 12/16/24 7:18 AM, Maciej Wieczor-Retman wrote:
> 
> Sub-Numa Clustering (SNC) allows splitting CPU cores, caches and memory
> into multiple NUMA nodes. When enabled, NUMA-aware applications can
> achieve better performance on bigger server platforms.
> 
> SNC support was merged into the kernel [1]. With SNC enabled
> and kernel support in place all the tests will function normally (aside
> from effective cache size). There might be a problem when SNC is enabled
> but the system is still using an older kernel version without SNC
> support. Currently the only message displayed in that situation is a
> guess that SNC might be enabled and is causing issues. That message also
> is displayed whenever the test fails on an Intel platform.
> 
> Add a mechanism to discover kernel support for SNC which will add more
> meaning and certainty to the error message.
> 
> Add runtime SNC mode detection and verify how reliable that information
> is.
> 
> Series was tested on Ice Lake server platforms with SNC disabled, SNC-2
> and SNC-4. The tests were also ran with and without kernel support for
> SNC.
> 
> Series applies cleanly on kselftest/next.
> 

Could you please consider this series for inclusion?

Thank you very much.

Reinette