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sfid-20260120_145931_940963_1A1F601C X-CRM114-Status: GOOD ( 36.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Suddep Holla writes: > On Wed, Aug 20, 2025 at 04:44:29PM -0700, Christoph Lameter (Ampere) wrote: > > On Mon, 18 Aug 2025, Sudeep Holla wrote: > > > > > > But returning to the original point, its not clear to me that the HW > > > > 'cluster' information is really causing the performance boost vs, just > > > > having a medium size scheduling domain (aka just picking an arbitrary size > > > > 4-16 cores) under MC, or simply 'slicing' a L3 in the PPTT such that the M > C > > > > domains are smaller, yields the same effect. I've seen a number of cases > > > > where 'lying' about the topology yields a better result in a benchmark. Th > is > > > > is largely what is happening with these Firmware toggles that move/remove > > > > the NUMA domains too. Being able to manually reconfigure some of these > > > > scheduling levels at runtime might be useful... > > > > > > > > > > I share your concern and hence completely again representation of any fake > > > data in the ACPI topology just to get improved performance. Yes we have seen > > > that in the past. > > > > Depends on what you call fake. There are microarchitectural issues > > regarding the proximity of the processors that the customer may not know > > about and therefore the data provides by the vendor may be considered > > "fake". Certainly that is not the case for our processors. > > Fair enough. We have seen systems with fake data as those data seem to > accidentally improve performance. > > > This is a common feature and widely available on other platforms. > > There is no need to do anything but enable the functionality. Having a > > special version of ACPI for arm64 or a special handling for arm64 does not > > make sense. > > > > I am not suggesting to make it any special on Arm64, we would never want > that unless absolutely needed and this is not one such thing. > > > The ACPI subsystem provides the ability to add blacklists. If a vendor has > > problems with their firmward providing data that reduces the performance > > and is unable to fix it othereise then the vendor can use that feature to > > disable these ACPI features for their platform by submitting a patch. > > > > I don't have a strong opinion on that approach. IIUC, maintaining list > needs change in the kernel which Jeremy mentioned is not what distro > prefer over command line parameter. We can always have a parameter to > disable the feature and keep the build config enabled as in this patch. > So only platforms that have performance issue by enabling this will have > to add the command line parameter(hopefully that works for all) Resurrecting this old thread. We enable CONFIG_SCHED_CLUSTER by default on Oracle UEK kernels. And, this thread didn't really come to a consensus, but I'm trying to figure out what's the best approach if we want to enable this by default? Thanks -- ankur