From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (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 3726C4AF16B; Mon, 31 Aug 2026 17:29:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788197352; cv=none; b=aPPEy3PXRu610zW7bH+cc1HHXixYZh8EOSKLZ6CkekLSFUldIazbsH3db4HJ1gOBMkG7Z2+gg9Vw/DzS+gnKrAOWBrA0ISJEPBz4u7Ahx/Ep2VGxrjfZhVaJuguyQyTT4e98Z5CbqIziVeB/N5K84xDvJQd/eW9jbx97cH8mxLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788197352; c=relaxed/simple; bh=a1/znAPVOMGvYSl25o82OKUV2aH5tav4WPnmQ9FKMlw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=t6d4rYKY9Pmi2Q5zSNOZ0Kz/3yLFcWp9O73KkXXxJJmCOME8uOF4AdRUHMIiT9DKyrFmz8VxISvzvDLtLiGraNu3h8gicjFw4G3zBWgEhpo9bun8w/YzDTtSjEHqk4SS6kjaQvJeqpH8NiRysBD85xy65Uh8PZ3C4oMHfiBJXRs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=YshEmdCx; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="YshEmdCx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1788197350; x=1819733350; h=message-id:subject:from:to:cc:date:in-reply-to: references:content-transfer-encoding:mime-version; bh=a1/znAPVOMGvYSl25o82OKUV2aH5tav4WPnmQ9FKMlw=; b=YshEmdCxx6k4ugUwy+EfV0C5aFUcFwqdma+U6m5t6tjS+Nvu3V2glXu5 IxBytzsFLr9p7oFoG5saRFJ4QolliosnKbezJFDRGHvd2bYz4MyU9OUmx VsK1Oib0HaEhNvagfOQUxmadkJjntFYg6DtJb2RcDN77AqUGcfCPqJtLw 2gy1rLufQrZmWluHCQyNDaxhRH8VQATURn01oPpezGK5xhErlXSk5vGEO iWJwdu+Rcv6DsxkAx2H3nu1jJ/ATeVE0gnGvNpwH7CpiQVGgt2mo3f8pv jiDRLICa7s5YNrCxNv4Yn1WPzFNK7cEc0O4wPw/N+o7T3sNE8VzjFROcQ A==; X-CSE-ConnectionGUID: wLj9vUXhRUCk9llHaWWFKw== X-CSE-MsgGUID: iwwuPu8YSB+8+3KUsylzlw== X-IronPort-AV: E=McAfee;i="6800,10657,11892"; a="105985186" X-IronPort-AV: E=Sophos;i="6.25,254,1779174000"; d="scan'208";a="105985186" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2026 10:29:09 -0700 X-CSE-ConnectionGUID: gL8afe7FQ4as9lljLKc0Ug== X-CSE-MsgGUID: nG6uwSFoRkWPwaYiZzvQow== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,254,1779174000"; d="scan'208";a="265143274" Received: from unknown (HELO [10.241.243.185]) ([10.241.243.185]) by fmviesa010-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2026 10:29:08 -0700 Message-ID: <406a5c407bbe60cafc24f715e089f5552a0791f9.camel@linux.intel.com> Subject: Re: Cache-aware scheduling does not work well with amd big/little cores From: Tim Chen To: Klaus Kusche , "Chen, Yu C" , Mario Limonciello Cc: "Badole, Vishal" , Peter Zijlstra , linux-kernel@vger.kernel.org, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , platform-driver-x86@vger.kernel.org, K Prateek Nayak , ricardo.neri@intel.com Date: Mon, 31 Aug 2026 10:29:08 -0700 In-Reply-To: <369d0bbb-db7a-4f86-bee2-332d5295c452@computerix.info> References: <2180ea5a-eb28-4152-8d4d-cd00b0c24b2e@computerix.info> <8064e1d8-b51c-48e5-a312-8c31581991f5@amd.com> <369d0bbb-db7a-4f86-bee2-332d5295c452@computerix.info> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.1 (3.58.1-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-08-31 at 13:24 +0200, Klaus Kusche wrote: > Hello, >=20 > both patches in combination seem to have the desired effect. >=20 > But I just look at a bar graph showing the current load > of each core.=20 > The graph suggests that long-running CPU-intensive processes=20 > migrate to fast cores when fast cores become available. > And I have the impression that LTO compilations > finish significantly faster now. >=20 > I don't have exact numbers or benchmarks. Thanks for testing the fix. If you just apply https://lore.kernel.org/lkml/20260825174112.2580942-1-tim= .c.chen@linux.intel.com/, with default aggr_tolerance, what numbers do you see? That will be helpful for further tuning. Thanks. Tim=20