From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 283F92E11CC for ; Sat, 14 Jun 2025 10:15:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749896139; cv=none; b=Ptis9lkFTlxKtHp8o5Wjk77qIes4urZdBRyL5BFqvMaNTvDTrcCtqphzXLwOgv3f7z15XXEjpadRnfAlaH6QuZ/Xn2PpQD68O5k6k0tNPIzpSEBX1gevKs+yjnKI9PRTd3rkLZaf9hDw2HBefnuuRtQJdHTb9ZMKb9/gGbOI1M8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749896139; c=relaxed/simple; bh=7iOn03Bt0ToSlEWNeZdByx/mY5yVq2Mgma8Ie0fT4CQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bn0uY0krdIzOpVAQlBTrsSuZ0irWZ+NVtTFGweXX5+NCO7lyza7tqMaym9Qx6lnMYunAuKaFodC3AENqrmz16dHi10MW6KP2V9tR5DtlwLaVFE40+Ht0neWx6GVy6mfVYKyo6572d1fdmLBMUIc+oxrbEbQjlDxmsR2Z0O4mx8A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=nXempXcd; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="nXempXcd" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=TfnWjtpSzxGmXtI2fFxBe639Cn21XUsmN7JrjtsgxZg=; b=nXempXcdpZnEmjZf0TODKsSq4/ L9Z+Ay3qY7kq9u7SYvcmylsfRGUo3HTnuf0T3uX2uWBoktMARUHay2PU5szhIZ7E+RO6Dac4ybaTM Cu3o+jGNI9tCHaCZcfePStG8HL+KGG9w59c4+QrEayQ3ahSTPlP9G4DbXNfN7KGAlBmZ5n9m461Hg L/ljr1O4fzgTO4DCHcfS9737/3IpoPWRUaEo5hVIM666ZpJiD7uGeOgK79FPG1AOOn4GbhFo41fk8 B8lTfEthWCRa4tzPkpsxlowiI2j6s9vRyHomnlQX8/tzNHdwk9yJttB0WEyJV0H/HlElhKuvjAu38 gcP5CUFw==; Received: from 2001-1c00-8d82-d000-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d82:d000:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uQNv7-0000000DvTL-3H4M; Sat, 14 Jun 2025 10:15:29 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id DD01F30861C; Sat, 14 Jun 2025 12:15:28 +0200 (CEST) Date: Sat, 14 Jun 2025 12:15:28 +0200 From: Peter Zijlstra To: K Prateek Nayak Cc: mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, linux-kernel@vger.kernel.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, clm@meta.com Subject: Re: [RFC][PATCH 0/5] sched: Try and address some recent-ish regressions Message-ID: <20250614101528.GJ2278213@noisy.programming.kicks-ass.net> References: <20250520094538.086709102@infradead.org> <2bb35bb3-cbe4-460f-a209-1fe4095e1dce@amd.com> <2d747fb5-81e7-48ac-ae51-db737a170b81@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2d747fb5-81e7-48ac-ae51-db737a170b81@amd.com> On Fri, Jun 13, 2025 at 08:58:56AM +0530, K Prateek Nayak wrote: > - schbench (old) has a consistent regression for 16, 32, 64, > 128, 256 workers (> CCX size, < Overloaded) except for with > 256 workers case with TTWU_QUEUE_DEFAULT which shows an > improvement. > > - new schebench has few regressions around 32, 64, and 128 > workers for wakeup and request latency. Right, so I actually made Chris' favourite workloads worse with these patches :/ Let me go try this again..