From: Reinette Chatre <reinette.chatre@intel.com>
To: <babu.moger@amd.com>
Cc: <bagasdotme@gmail.com>, <bp@alien8.de>, <corbet@lwn.net>,
<dave.hansen@linux.intel.com>, <eranian@google.com>,
<fenghua.yu@intel.com>, <hpa@zytor.com>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<mingo@redhat.com>, <tglx@linutronix.de>, <tony.luck@intel.com>,
<x86@kernel.org>
Subject: Re: [PATCH v3 02/10] x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag
Date: Tue, 30 Aug 2022 15:23:17 -0700 [thread overview]
Message-ID: <a0712968-973b-b1f4-e955-bca2925fd79f@intel.com> (raw)
In-Reply-To: <3aa991a8-ac08-297d-8328-5380897f6dd9@amd.com>
Hi Babu,
On 8/30/2022 3:10 PM, Moger, Babu wrote:
> On 8/30/2022 11:39 AM, Reinette Chatre wrote:
>> Would the "SMBA" resource be available only when CXL.mem devices are present
>> on the system? Since this is a CPU feature it is unclear to me whether
>> presence of CXL.mem devices would be known at the time "SMBA" is enumerated.
>> Could the "SMBA" resource thus exist without memory to throttle?
>
> Yes.The presence of the SMBA feature(with CXL.mem) is independent of whether slow memory is actually present in the system.If there is no slow memory, then setting a SMBA limit will have no impact on the performance of the system.
>
I think this is significant and should also be documented.
Reinette
next prev parent reply other threads:[~2022-08-30 22:28 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-22 13:42 [PATCH v3 00/10] x86/resctrl: Support for AMD QoS new features and bug fix Babu Moger
2022-08-22 13:42 ` [PATCH v3 01/10] x86/resctrl: Fix min_cbm_bits for AMD Babu Moger
2022-08-23 20:56 ` Reinette Chatre
2022-08-24 15:58 ` Moger, Babu
2022-08-22 13:42 ` [PATCH v3 02/10] x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag Babu Moger
2022-08-23 22:47 ` Reinette Chatre
2022-08-25 22:42 ` Moger, Babu
2022-08-26 16:17 ` Reinette Chatre
2022-08-29 23:25 ` Babu Moger
2022-08-30 16:39 ` Reinette Chatre
[not found] ` <3aa991a8-ac08-297d-8328-5380897f6dd9@amd.com>
2022-08-30 22:23 ` Reinette Chatre [this message]
2022-08-30 22:28 ` Moger, Babu
2022-08-22 13:43 ` [PATCH v3 03/10] x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA Babu Moger
2022-08-24 17:39 ` Reinette Chatre
2022-08-26 14:59 ` Moger, Babu
2022-08-22 13:43 ` [PATCH v3 04/10] x86/resctrl: Detect and configure Slow Memory Bandwidth allocation Babu Moger
2022-08-23 22:47 ` Reinette Chatre
2022-08-24 16:48 ` Moger, Babu
2022-08-22 13:43 ` [PATCH v3 05/10] x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature flag Babu Moger
2022-08-22 13:43 ` [PATCH v3 06/10] x86/resctrl: Introduce mon_configurable to detect Bandwidth Monitoring Event Configuration Babu Moger
2022-08-24 21:15 ` Reinette Chatre
2022-08-25 15:11 ` Moger, Babu
2022-08-25 15:56 ` Reinette Chatre
2022-08-25 20:44 ` Moger, Babu
2022-08-25 21:24 ` Reinette Chatre
2022-08-26 14:30 ` Babu Moger
2022-08-22 13:43 ` [PATCH v3 07/10] x86/resctrl: Add sysfs interface files to read/write event configuration Babu Moger
2022-08-24 21:15 ` Reinette Chatre
2022-08-26 16:07 ` Moger, Babu
2022-08-26 16:35 ` Reinette Chatre
2022-08-26 16:57 ` Moger, Babu
2022-08-22 13:44 ` [PATCH v3 08/10] x86/resctrl: Add the sysfs interface to read the " Babu Moger
2022-08-22 13:47 ` Bagas Sanjaya
2022-08-22 13:50 ` Moger, Babu
2022-08-22 13:55 ` Moger, Babu
2022-08-23 1:55 ` Bagas Sanjaya
2022-08-24 21:16 ` Reinette Chatre
2022-08-26 16:49 ` Moger, Babu
2022-08-26 17:34 ` Reinette Chatre
2022-08-26 18:34 ` Moger, Babu
2022-08-22 13:44 ` [PATCH v3 09/10] x86/resctrl: Add sysfs interface to write " Babu Moger
2022-08-24 21:16 ` Reinette Chatre
2022-08-26 18:17 ` Moger, Babu
2022-08-22 13:45 ` [PATCH v3 10/10] Documentation/x86: Update resctrl_ui.rst for new features Babu Moger
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