From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C31AC3C4565 for ; Wed, 9 Sep 2026 07:20:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788938449; cv=none; b=YfHiNIRcrOyo33SfvCqRpWtw7MWWJ6iMeOZI9jlorXxr/3cvdOUjyrmZeda6CRYZw0UkwjWpEL2nnZ/s2EnGsAGBxP1fWmblitgC62G6mmFzaIaMRTMHVwFgoH39C8cFpj1V3+QkN0P/IRiHEMvMKpfdo772/JNTZG3r1iw5O1Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788938449; c=relaxed/simple; bh=HYah3uA+r1kGGwUj3wqj+G+RHCOLv0YNwo6nuTVfIPU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=eitDYwsdcxXac41/SobaDq0BIJfk81q3le5b6Zx23e/TnMwY2UAr0PowBbckvBaIMZBFPwQnFV6Vkh+ccj0l357LML0vkuA2itFmxSW698Y6nymwlJB1TRTKA2tJ9bTj2sqK7PxIsst0F8g/MW+O+e0ypC1JqwneX04LSGabfqw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=dQDQUeoy; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="dQDQUeoy" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 883F61576; Wed, 9 Sep 2026 00:20:36 -0700 (PDT) Received: from [10.57.73.177] (unknown [10.57.73.177]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 23F153F7D8; Wed, 9 Sep 2026 00:20:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788938440; bh=HYah3uA+r1kGGwUj3wqj+G+RHCOLv0YNwo6nuTVfIPU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=dQDQUeoyd7rs5J3jJ2hcytzoFlCrUnuzWP/nB2QjLK0BzOhs9FoYIWjtpl4cvn6qQ V6997eLToNmC4iplPw1+KazMVhObpi6NE1jR/Shmi2nrP7e8aR5/i1v3oAvusylahm NVcSza6cWx3MNd86cbw8I3q7WzjD7IqJNeTmEkBc= Message-ID: Date: Wed, 9 Sep 2026 09:20:35 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus To: Andrea Righi , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Catalin Marinas , Will Deacon Cc: Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Mark Rutland , Christian Loehle , Shrikanth Hegde , Phil Auld , Breno Leitao , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260908082345.103087-1-arighi@nvidia.com> Content-Language: en-GB From: Dietmar Eggemann In-Reply-To: <20260908082345.103087-1-arighi@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 08.09.26 10:23, Andrea Righi wrote: [...] > The series was tested on a two-node Vera system using an 88-thread > single-precision GEMM on the 88 physical cores of NUMA node 0. Can we use 'OpenBLAS benchmark/sgemm.goto' as an open alternative for your NVIDIA internal single-precision GEMM benchmark? IIUC, you used it for the 'Prefer fully idle cores for NOHZ balancing' work: https://lore.kernel.org/r/anIq6pU5KXTTFCDN@gpd4 If yes, I assume you would run something like: export OMP_NUM_THREADS=88 numactl -C XXX --membind=0 ./benchmark/sgemm.goto 16384 16384 16384 Essentially you want to show that those 88 compute intensive tasks each runs on his own core alone and so you get a higher TFLOPS value. [...]