From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757447Ab1EUADX (ORCPT ); Fri, 20 May 2011 20:03:23 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:40142 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757406Ab1EUADI (ORCPT ); Fri, 20 May 2011 20:03:08 -0400 Message-ID: <4DD70120.9090801@kernel.org> Date: Fri, 20 May 2011 17:02:40 -0700 From: Yinghai Lu User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110414 SUSE/3.1.10 Thunderbird/3.1.10 MIME-Version: 1.0 To: paulmck@linux.vnet.ibm.com CC: linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, tglx@linutronix.de, mingo@elte.hu Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" References: <4DD6D746.6070107@kernel.org> <20110520224250.GL2366@linux.vnet.ibm.com> <4DD6F4A2.1070401@kernel.org> <20110520231428.GN2366@linux.vnet.ibm.com> <4DD6F64C.3030402@kernel.org> <20110520234923.GQ2366@linux.vnet.ibm.com> In-Reply-To: <20110520234923.GQ2366@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Source-IP: rtcsinet22.oracle.com [66.248.204.30] X-CT-RefId: str=0001.0A090202.4DD70128.0038,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/20/2011 04:49 PM, Paul E. McKenney wrote: > On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote: ... >> >> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled. > > OK, just to make sure I understand... You are compiling exactly the > same kernel source tree with exactly the same .config, just with two > different versions of gcc, correct? yes. > > If so, it is quite possible that the slow one is the correct one. :-/ yeah, new version always have problem. looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1 Yinghai