Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 5 Aug 2002 19:03:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 5 Aug 2002 19:03:04 -0400 Received: from mg01.austin.ibm.com ([192.35.232.18]:28086 "EHLO mg01.austin.ibm.com") by vger.kernel.org with ESMTP id ; Mon, 5 Aug 2002 19:03:04 -0400 Message-ID: <3D4F0403.B136A031@us.ibm.com> Date: Mon, 05 Aug 2002 18:02:27 -0500 From: Duc Vianney X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net, mcao@us.ibm.com, bhartner@us.ibm.com Subject: IPC lock patch performance improvement Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1357 Lines: 26 I ran the LMbench Pipe and IPC latency test bucket against the IPC lock patch from Mingming Cao and found the patch improves the performance of those functions from 1% to 9%. See the attached data. The kernel under test is 2.5.29, SMP kernel running on a 4-way 500 MHz. The data for 2.5.29s4-ipc represents the average of three runs. Percent 2.5.29s4 2.5.29s4-ipc Improvement Pipe latency 12.51 11.43 9% AF_Unix sock stream latency 21.61 19.82 8% UDP latency using localhost 36.28 35.12 3% TCP latency using localhost 56.90 54.89 4% RPC/tcp latency using local host 123.30 121.91 1% RPC/udp latency using localhost 89.78 88.70 1% TCP/IP connection cost to localhost 192.74 187.76 3% Note: Latency is in microseconds Note: 2.5.29s4 is the base 2.5.29 SMP kernel running on a 4-way, 2.5.29s4-ipc is the base 2.5.29 SMP kernel built with IPC lock patch. Duc. dvianney@us.ibm.com - 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/