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Thu, 10 Sep 2026 01:29:26 +0000 Message-ID: <2fe2c681-b748-41fa-8b56-1169c86cefbc@intel.com> Date: Thu, 10 Sep 2026 09:29:09 +0800 User-Agent: Mozilla Thunderbird Subject: Re: Cache-aware scheduling does not work well with amd big/little cores To: Tim Chen , Mario Limonciello , Klaus Kusche CC: "Badole, Vishal" , Peter Zijlstra , , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , , K Prateek Nayak , References: <2180ea5a-eb28-4152-8d4d-cd00b0c24b2e@computerix.info> <8064e1d8-b51c-48e5-a312-8c31581991f5@amd.com> <369d0bbb-db7a-4f86-bee2-332d5295c452@computerix.info> <406a5c407bbe60cafc24f715e089f5552a0791f9.camel@linux.intel.com> <14630984-9287-4454-b52f-3a1e526e1fdf@computerix.info> <3cb5cbdb227bee0b822f1550e10659faadd77a3d.camel@linux.intel.com> <76dba935-1052-4fa9-a70c-16cecdfd12c8@amd.com> <4da55124e32dd0587a3516c8f5ed512bffbbb42e.camel@linux.intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <4da55124e32dd0587a3516c8f5ed512bffbbb42e.camel@linux.intel.com> Content-Type: text/plain; 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You mentioned later the result for (b) >>>> and (c) are about the same with or without the patch >>>> exposing debugfs (commit c1e7fe5e75ed11fa85368e5a186472afd3858f3a >>>> Mario mentioned in another mail). >>>> But here you say the result is much worse without Mario's patch. >>>> Is Mario's patch the one above or some other patch? >>> >>> The with/without patch in (b) and (c) >>> refers to the patch you sent on 31/08/2026 >>> ( https://lore.kernel.org/lkml/20260825174112.2580942-1-tim.c.chen@linux.intel.com/ ), >>> not to Mario's patch. >>> >> >> Just to clarify Mario's patch in this context refers to the fix to >> ITMT/debugfs fixes as Klaus doesn't nominally enable debugfs in Kconfig: >> >> eaece4849991d62fcd6f46637c55dcce00e25d70 >> > > Ricardo reminded me that AMD's hybrid CPU relies on SD_ASYM_PACKING instead > of SD_ASYM_CPUCAPACITY. So the patch I pointed to > (https://lore.kernel.org/lkml/20260825174112.2580942-1-tim.c.chen@linux.intel.com/) > only fixes the SD_ASYM_CPUCAPACITY case and would not have an effect on > your test system. > > The fact that ITMT needs to be turned on to improve performance also point > in that direction. > > There was a bug that Chen Yu fixes for ITMT compatability with cache aware scheduling. > It prevents a task from getting stuck in the wrong LLC in the ITMT case > (https://lore.kernel.org/lkml/20260810033742.1688718-1-yu.c.chen@intel.com/). > Klaus, Can you apply that with Mario's ITMT/debugfs patch to see if that > improves performance on your system? > > Tim Yes, that patch tries to coordinate ITMT with cache-aware scheduling. It would also be helpful to get a dump of /sys/kernel/sched/debug/domains/* to confirm that the SD_ASYM_PACKING flag is set at the MC domains as well as /sys/kernel/debug/x86/sched_itmt_enabled to double-check that ITMT is enabled and /sys/kernel/debug/x86/sched_core_priority to look at CPU priorities. thanks, Chenyu