linux-kernel - Re: [PATCH v2 1/2] selftests/resctrl: Adjust effective L3 cache size with SNC enabled

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <7apqfgfcb3mns3dmnmvwlvuhbqn6yht3tprrcd4lyavt27u5bw@bxulqnh6blle>
Date: Thu, 16 May 2024 08:01:17 +0200
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: "Luck, Tony" <tony.luck@...el.com>
CC: "Yu, Fenghua" <fenghua.yu@...el.com>, "shuah@...nel.org"
	<shuah@...nel.org>, "Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v2 1/2] selftests/resctrl: Adjust effective L3 cache size
 with SNC enabled

On 2024-05-15 at 16:48:44 +0000, Luck, Tony wrote:
>If/when my SNC patches go upstream the SNC check could become:
>
>snc_ways=$(ls -d /sys/fs/resctrl/mon_data/mon_L3_00/mon_sub_L3_* 2>/dev/null | wc -l)

But this won't work without your kernel patches right? 

If they are already in the kernel used by the person launching the selftests
then there shouldn't be any problems to report. The idea was that if the
CMT/MBM/MBA selftests fail, the message with "SNC is the problem" is only
displayed if SNC is enabled and there is no kernel support for SNC.

>
>assuming you have /sys/fs/resctrl mounted.
>
>-Tony

-- 
Kind regards
Maciej Wieczór-Retman