From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966065AbWKNW66 (ORCPT ); Tue, 14 Nov 2006 17:58:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965992AbWKNW66 (ORCPT ); Tue, 14 Nov 2006 17:58:58 -0500 Received: from mga07.intel.com ([143.182.124.22]:8636 "EHLO azsmga101.ch.intel.com") by vger.kernel.org with ESMTP id S966442AbWKNW65 (ORCPT ); Tue, 14 Nov 2006 17:58:57 -0500 X-ExtLoop1: 1 X-IronPort-AV: i="4.09,422,1157353200"; d="scan'208"; a="146249784:sNHT18432246" Date: Tue, 14 Nov 2006 14:35:42 -0800 From: "Siddha, Suresh B" To: mingo@elte.hu, nickpiggin@yahoo.com.au, akpm@osdl.org Cc: linux-kernel@vger.kernel.org, clameter@sgi.com, kenneth.w.chen@intel.com Subject: [patch] sched domain: increase the SMT busy rebalance interval Message-ID: <20061114143542.A30786@unix-os.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org With SMT, if the logical processor is busy, load balance happens for every 8msec(min)-16msec(max). There is no need to do this often, as this is just for fairness(to maintain uniform runqueue lengths) and default time slice anyhow is 100msec. Appended patch increases this interval to 64msec(min)-128msec(max) when the logical processor is busy. Signed-off-by: Suresh Siddha --- diff --git a/include/linux/topology.h b/include/linux/topology.h index da508d1..b93bb6c 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -93,7 +93,7 @@ #define SD_SIBLING_INIT (struct sched_do .groups = NULL, \ .min_interval = 1, \ .max_interval = 2, \ - .busy_factor = 8, \ + .busy_factor = 64, \ .imbalance_pct = 110, \ .cache_nice_tries = 0, \ .per_cpu_gain = 25, \