Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758327AbZCQTCG (ORCPT ); Tue, 17 Mar 2009 15:02:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756280AbZCQTBy (ORCPT ); Tue, 17 Mar 2009 15:01:54 -0400 Received: from wf-out-1314.google.com ([209.85.200.170]:1079 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755942AbZCQTBx (ORCPT ); Tue, 17 Mar 2009 15:01:53 -0400 MIME-Version: 1.0 In-Reply-To: <49BFEF01.1060703@hp.com> References: <20090317013220.GA22474@Krystal> <49BFEF01.1060703@hp.com> Date: Wed, 18 Mar 2009 02:01:51 +0700 Message-ID: Subject: Re: cli/sti vs local_cmpxchg and local_add_return From: Andika Triwidada To: "Alan D. Brunelle" Cc: Mathieu Desnoyers , "Paul E. McKenney" , Ingo Molnar , Josh Boyer , linux-kernel@vger.kernel.org, ltt-dev@lists.casi.polymtl.ca Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1765 Lines: 68 Older IA-64 processor : 3 vendor : GenuineIntel arch : IA-64 family : 32 model : 0 model name : Intel(r) Itanium(r) 2 Processor 1.6GHz with 18M L3 Cache for 533MHz Platforms revision : 7 archrev : 0 features : branchlong, 16-byte atomic ops cpu number : 0 cpu regs : 4 cpu MHz : 1594.911 itc MHz : 399.226174 BogoMIPS : 3186.68 siblings : 2 physical id: 1 core id : 1 thread id : 0 test init test results: time for baseline number of loops: 20000 total time: 10003 -> baseline takes 0 cycles test end test results: time for locked cmpxchg number of loops: 20000 total time: 60073 -> locked cmpxchg takes 3 cycles test end test results: time for non locked cmpxchg number of loops: 20000 total time: 60014 -> non locked cmpxchg takes 3 cycles test end test results: time for locked add return number of loops: 20000 total time: 150007 -> locked add return takes 7 cycles test end test results: time for non locked add return number of loops: 20000 total time: 150009 -> non locked add return takes 7 cycles test end test results: time for enabling interrupts (STI) number of loops: 20000 total time: 45003 -> enabling interrupts (STI) takes 2 cycles test end test results: time for disabling interrupts (CLI) number of loops: 20000 total time: 59999 -> disabling interrupts (CLI) takes 2 cycles test end test results: time for disabling/enabling interrupts (STI/CLI) number of loops: 20000 total time: 105001 -> enabling/disabling interrupts (STI/CLI) takes 5 cycles test end -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/