From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2CC7C004D3 for ; Mon, 22 Oct 2018 18:47:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8AA6920663 for ; Mon, 22 Oct 2018 18:47:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="eL2Wf8Mt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8AA6920663 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728483AbeJWDHV (ORCPT ); Mon, 22 Oct 2018 23:07:21 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:49846 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727748AbeJWDHV (ORCPT ); Mon, 22 Oct 2018 23:07:21 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w9MIiIrJ157874; Mon, 22 Oct 2018 18:47:20 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=XFwxmK7iDoxHdWyToLU4Am7OJ7HnxcXSQILb4j0RfgY=; b=eL2Wf8MtlP4brC4E19V8dPAQJ3cIxSBOjTjuii99Xk74rxCHMNGIy4B9GOLBlRi/vWbV S1zBxPZxYFShC93B0oyTMKtJvFii/7v1IQ3vdJcfImoXEBhbk9FMQuaoVMklzg8ZItQZ A2vSstfz8Kj7FuBgsxbfJl/rY2eYx8k/c9h8AWf2ySftOgEoonT8wWP6mZLxCoJFLAp/ oYcf1El7DC5Ylpl1WL3YVScr7Esa4S0A+Uyv7xM6+0bbNwogvKm7w/0yz8vkS7Ed/Tbp hEe1zJc8chqJo+VzxpSK72V+DHPFRajHGLLIvWD7nIbgIuKvqS6O2xNO71RlJXW44Wj+ jA== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp2120.oracle.com with ESMTP id 2n7vaprfk2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Oct 2018 18:47:20 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w9MIlIwp017732 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Oct 2018 18:47:19 GMT Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w9MIlI21017594; Mon, 22 Oct 2018 18:47:18 GMT Received: from [10.39.206.107] (/10.39.206.107) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 22 Oct 2018 11:47:18 -0700 Subject: Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes To: Peter Zijlstra Cc: mingo@redhat.com, subhra.mazumdar@oracle.com, dhaval.giani@oracle.com, rohit.k.jain@oracle.com, daniel.m.jordan@oracle.com, pavel.tatashin@microsoft.com, matt@codeblueprint.co.uk, umgwanakikbuti@gmail.com, riel@redhat.com, jbacik@fb.com, juri.lelli@redhat.com, linux-kernel@vger.kernel.org References: <1540220381-424433-1-git-send-email-steven.sistare@oracle.com> <1540220381-424433-10-git-send-email-steven.sistare@oracle.com> <20181022170604.GG3117@worktop.programming.kicks-ass.net> From: Steven Sistare Organization: Oracle Corporation Message-ID: <1356a3cc-a9f2-6593-4737-1b20fc5daa75@oracle.com> Date: Mon, 22 Oct 2018 14:47:00 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181022170604.GG3117@worktop.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9054 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=739 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810220160 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/22/2018 1:06 PM, Peter Zijlstra wrote: > On Mon, Oct 22, 2018 at 07:59:40AM -0700, Steve Sistare wrote: >> The STEAL feature causes regressions on hackbench on larger NUMA systems, >> so disable it on systems with more than sched_steal_node_limit nodes >> (default 2). > > How come? From a quick read the stealing is per LLC, where do we steal > across nodes? See the complete explanation in this patch. It is deeper than can be gleaned from a quick read. - Steve