From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754762Ab1LVB6O (ORCPT ); Wed, 21 Dec 2011 20:58:14 -0500 Received: from mga14.intel.com ([143.182.124.37]:18830 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753026Ab1LVB6L (ORCPT ); Wed, 21 Dec 2011 20:58:11 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="88328351" Subject: Re: [tip:sched/urgent] sched: Fix select_idle_sibling() regression in selecting an idle SMT sibling From: Suresh Siddha Reply-To: Suresh Siddha To: "Shi, Alex" Cc: Peter Zijlstra , "mingo@redhat.com" , "hpa@zytor.com" , "linux-kernel@vger.kernel.org" , "efault@gmx.de" , "tglx@linutronix.de" , "mingo@elte.hu" , "linux-tip-commits@vger.kernel.org" Date: Wed, 21 Dec 2011 18:03:13 -0800 In-Reply-To: <1324517502.17054.174.camel@debian> References: <1323978421.1984.244.camel@sbsiddha-desk.sc.intel.com> <1324471944.10752.8.camel@twins> <1324496556.21294.11.camel@sbsiddha-desk.sc.intel.com> <1324517502.17054.174.camel@debian> Organization: Intel Corp Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.0.3 (3.0.3-1.fc15) Content-Transfer-Encoding: 7bit Message-ID: <1324519393.21294.20.camel@sbsiddha-desk.sc.intel.com> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2011-12-21 at 17:31 -0800, Shi, Alex wrote: > This patch partly fixed a performance regression that triggered by > 4dcfe1025b513c2c, but issue still exists. So how much was the regression caused by the commit 4dcfe1025b513c2c and how much did we recover with this fix I posted. If we are talking about the regression caused by this single commit 4dcfe1025b513c2c, then I don't know of any other related fixes other than the recent fix we pushed upstream (ab2789213d224202237292d78aaa0c386c7b28b2). thanks, suresh