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Mon, 5 May 2025 17:39:56 +0000 Message-ID: Date: Mon, 5 May 2025 10:39:53 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/8] Support L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE) To: "Luck, Tony" , "Moger, Babu" , "Babu Moger" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" CC: "corbet@lwn.net" , "x86@kernel.org" , "hpa@zytor.com" , "akpm@linux-foundation.org" , "paulmck@kernel.org" , "rostedt@goodmis.org" , "thuth@redhat.com" , "ardb@kernel.org" , "gregkh@linuxfoundation.org" , "thomas.lendacky@amd.com" , "mario.limonciello@amd.com" , "perry.yuan@amd.com" , "seanjc@google.com" , "Huang, Kai" , "Li, Xiaoyao" , "kan.liang@linux.intel.com" , "riel@surriel.com" , "Li, Xin3" , "xin@zytor.com" , "Mehta, Sohil" , "ak@linux.intel.com" , "ebiggers@google.com" , "andrew.cooper3@citrix.com" , "gautham.shenoy@amd.com" , "Xiaojian.Du@amd.com" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "james.morse@arm.com" , "fenghuay@nvidia.com" , "peternewman@google.com" References: <3e0e9b68-2ebe-40f8-a840-1ad7cd3f56e0@amd.com> <3ca0a5dc-ad9c-4767-9011-b79d986e1e8d@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; 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While both Intel and AMD technically >> "uses CLOSid", it is done differently, no? >> >> Specifically, is this documentation introduced in patch #5 accurate for Intel? >> + The feature routes the I/O traffic via specific CLOSID reserved >> + for io_alloc feature. By configuring the CBM (Capacity Bit Mask) >> + for the CLOSID, users can control the L3 portions available for >> + I/0 traffic. The reserved CLOSID will be excluded for group creation. > > No. Intel doesn't reserve a single CLOS. It allows to assign RMIDs and CLOSids > for I/O monitoring and control. Different IDs can be assigned to different groups > of devices (the "grouping" is dependent on h/w routing to devices, not > assignable by the OS). How does this work with CDP on Intel? Can CDP be enabled for CPU agents while the "code" and "data" CLOSids be used for I/O control? Reinette