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

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Message-ID: <c1fd1a9a-ead7-4203-af55-5eeddef76f2d@linuxfoundation.org>
Date: Tue, 14 Jan 2025 16:25:19 -0700
From: Shuah Khan <skhan@...uxfoundation.org>
To: Reinette Chatre <reinette.chatre@...el.com>,
 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,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v8 0/2] selftests/resctrl: SNC kernel support discovery

On 1/14/25 15:30, Reinette Chatre wrote:
> Hi Shuah,
> 
> On 12/19/24 10:35 AM, Reinette Chatre wrote:
>> 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
>>
> 
> (bumping visibility of request made close to holidays)
> 
> This series still applies cleanly to kselftest/next. Could you please
> consider it for inclusion?
> 
> Thank you very much.
> 
> Reinette
> 

Thank you for bumping it up to top of my Inbox.
I will apply these for 6.14-rc1 now.

thanks,
-- Shuah