From: Reinette Chatre <reinette.chatre@intel.com>
To: "Luck, Tony" <tony.luck@intel.com>, James Morse <james.morse@arm.com>
Cc: "Wieczor-Retman, Maciej" <maciej.wieczor-retman@intel.com>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
Shuah Khan <shuah@kernel.org>,
"ilpo.jarvinen@linux.intel.com" <ilpo.jarvinen@linux.intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages
Date: Mon, 18 Mar 2024 14:26:25 -0700 [thread overview]
Message-ID: <176e6031-c95f-4c75-9857-5f8fe6c4e67a@intel.com> (raw)
In-Reply-To: <SJ1PR11MB6083FAA69AF7F712B34CA292FC2D2@SJ1PR11MB6083.namprd11.prod.outlook.com>
On 3/18/2024 2:04 PM, Luck, Tony wrote:
>>> What is the use case for needing to expose the individual cluster counts? What if
>>> resctrl just summed the cluster counts and presented the data as before - per L3
>>> cache instance? I doubt that resctrl would be what applications would use to verify
>>> whether they are "well behaved" wrt NUMA.
>>
>> Reinette,
>>
>> My (perhaps naïve) belief is that in a cloud server environment there are many
>> well behaved NUMA applications. Only presenting the sum would lose the detailed
>> information from each SNC node.
>
> Is the answer to "A" or "B" ... why not provide both:
>
> $ ls -l /sys/fs/resctrl/mon_data
> total 0
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_L3_00
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_L3_01
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_00
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_01
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_02
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_03
>
> The "L3" entries provide the sum across all SNC nodes sharing the cache. The NODE ones
> give the broken out counts.
Perhaps ... in this case it may make things easier to understand if
those "mon_NODE_*" directories are sub-directories of the appropriate
"mon_L3_*" directories.
Reinette
next prev parent reply other threads:[~2024-03-18 21:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 10:38 [PATCH 0/4] SNC support for resctrl selftests Maciej Wieczor-Retman
2024-03-06 10:39 ` [PATCH 1/4] selftests/resctrl: Adjust effective L3 cache size with SNC enabled Maciej Wieczor-Retman
2024-03-06 10:39 ` [PATCH 2/4] selftests/resctrl: SNC support for CMT Maciej Wieczor-Retman
2024-03-08 13:53 ` Ilpo Järvinen
2024-03-08 13:59 ` Ilpo Järvinen
2024-03-13 10:23 ` Maciej Wieczor-Retman
2024-03-06 10:39 ` [PATCH 3/4] selftests/resctrl: SNC support for MBM Maciej Wieczor-Retman
2024-03-08 14:07 ` Ilpo Järvinen
2024-03-13 10:26 ` Maciej Wieczor-Retman
2024-03-06 10:39 ` [PATCH 4/4] selftests/resctrl: Adjust SNC support messages Maciej Wieczor-Retman
2024-03-06 21:54 ` Luck, Tony
2024-03-07 9:25 ` Maciej Wieczor-Retman
2024-03-07 17:18 ` Luck, Tony
2024-03-07 17:41 ` Reinette Chatre
2024-03-07 17:57 ` Luck, Tony
2024-03-07 19:52 ` Reinette Chatre
2024-03-07 21:14 ` Luck, Tony
2024-03-07 22:39 ` Reinette Chatre
2024-03-07 23:16 ` Tony Luck
2024-03-07 23:41 ` Reinette Chatre
2024-03-08 18:06 ` James Morse
2024-03-08 18:42 ` Tony Luck
2024-03-15 18:02 ` James Morse
2024-03-18 19:15 ` Reinette Chatre
2024-03-18 19:34 ` Luck, Tony
2024-03-18 20:32 ` Reinette Chatre
2024-03-18 20:47 ` Luck, Tony
2024-03-18 21:04 ` Luck, Tony
2024-03-18 21:26 ` Reinette Chatre [this message]
2024-03-18 22:00 ` Luck, Tony
2024-03-18 22:43 ` Reinette Chatre
2024-03-18 21:23 ` Reinette Chatre
2024-03-18 22:04 ` Luck, Tony
2024-03-19 21:01 ` Peter Newman
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