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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9223d698-d16a-43c8-95c1-9839b81c2c23@intel.com>
Date: Tue, 14 Jan 2025 14:30:54 -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 12/19/24 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