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=-14.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 19996C4346E for ; Tue, 29 Sep 2020 07:57:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C865720773 for ; Tue, 29 Sep 2020 07:57:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ZrnaXY54"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="zJ6X3ZyI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbgI2H5e (ORCPT ); Tue, 29 Sep 2020 03:57:34 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:44392 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727591AbgI2H4v (ORCPT ); Tue, 29 Sep 2020 03:56:51 -0400 Date: Tue, 29 Sep 2020 07:56:48 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1601366209; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vZ3w8SsJAKo/o3IlRuPIMbGITx2IBGlQuNzdPw72lYI=; b=ZrnaXY54cCQMfSVGy4Hh6XrHzFzGmpcBYMWtpu1xRw37F4+kAPfYol0391PD/nJwSM7eTR k4NW3qcUPrAYHxlk5EgV7l2ztFqLZI0PEEV+jBnWsSYXAtHYLP1pVjK8i+AZC5eNH9Aq9Y l8uem3MvE/qRQbw1UYqTshFCOZjOzgJGBgvdpp6zptP2oxG0/ayzAgvlYLXFlpSoeKzkpx y9v0e8uUPwDeJLbrEKv7xwxuM+knSFf/IL6+4j+8tcWN43U4xCctSapj84/d2ld45XmZR3 OTNCjEXmGp+3eXpl0VxQZuxU1L92xv/qcfREggQ7nrD4y8TlitUzgWEFEAiGJQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1601366209; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vZ3w8SsJAKo/o3IlRuPIMbGITx2IBGlQuNzdPw72lYI=; b=zJ6X3ZyIn2MCYzDmJKXLU1klz78xP9N1R/PvJHUzEm4kGnLbgizMSq+IcqPrfLPfSd2pD9 02ixmCc6BC2e0QAw== From: "tip-bot2 for Vincent Guittot" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched/fair: Reduce busy load balance interval Cc: Vincent Guittot , "Peter Zijlstra (Intel)" , Phil Auld , x86 , LKML In-Reply-To: <20200921072424.14813-5-vincent.guittot@linaro.org> References: <20200921072424.14813-5-vincent.guittot@linaro.org> MIME-Version: 1.0 Message-ID: <160136620854.7002.17745483479490087690.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: 6e7499135db724539ca887b3aa64122502875c71 Gitweb: https://git.kernel.org/tip/6e7499135db724539ca887b3aa64122502875c71 Author: Vincent Guittot AuthorDate: Mon, 21 Sep 2020 09:24:24 +02:00 Committer: Peter Zijlstra CommitterDate: Fri, 25 Sep 2020 14:23:26 +02:00 sched/fair: Reduce busy load balance interval The busy_factor, which increases load balance interval when a cpu is busy, is set to 32 by default. This value generates some huge LB interval on large system like the THX2 made of 2 node x 28 cores x 4 threads. For such system, the interval increases from 112ms to 3584ms at MC level. And from 228ms to 7168ms at NUMA level. Even on smaller system, a lower busy factor has shown improvement on the fair distribution of the running time so let reduce it for all. Signed-off-by: Vincent Guittot Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Phil Auld Link: https://lkml.kernel.org/r/20200921072424.14813-5-vincent.guittot@linaro.org --- kernel/sched/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 41df628..a3a2417 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1348,7 +1348,7 @@ sd_init(struct sched_domain_topology_level *tl, *sd = (struct sched_domain){ .min_interval = sd_weight, .max_interval = 2*sd_weight, - .busy_factor = 32, + .busy_factor = 16, .imbalance_pct = 117, .cache_nice_tries = 0,