Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 6 Oct 2001 08:20:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 6 Oct 2001 08:20:06 -0400 Received: from sphinx.mythic-beasts.com ([195.82.107.246]:57101 "EHLO sphinx.mythic-beasts.com") by vger.kernel.org with ESMTP id ; Sat, 6 Oct 2001 08:19:53 -0400 Date: Sat, 6 Oct 2001 13:20:23 +0100 (BST) From: X-X-Sender: To: Subject: VM: 2.4.10ac4 vs. 2.4.11pre2 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, Here are some test results. Results are averaged over multiple runs. Comments and conclusions below. 2.4.11pre2 2.4.10ac4 dbench 8 34Mbyte/sec 40Mbyte/sec dbench 32 7.7Mbyte/sec 14Mbyte/sec bonnie++ write 17.5Mbyte/sec 18Mbyte/sec bonnie++ rewrite 5.6Mbyte/sec 5.8Mbyte/sec bonnie++ read 24Mbyte/sec 24.5Mbyte/sec kernel stress build 212min24s 229m54s linear swap test 1m30s 2m15s bonnie++ creat() 7200 9600 [*] bonnie++ stat() 2100 9000 [*] bonnie++ unlink() 5300 30000 [*] [*] either the ext2 directory optimization in 2.4.10ac is influencing the test, or 2.4.11pre2 VM has a problem caching inodes. Comments + conclusions ---------------------- - The 2.4.11pre2 VM is considerably more stable, where "stable" is defined as repeatable test scores and consistent performance. The 2.4.10ac4 VM is all over the place. - Both kernels exhibit similar interactive response under load. - The 2.4.11pre2 VM performs substantially better in tests which invoke swapping. - Surprisingly, the 2.4.10ac4 kernel does much much better at dbench. The 2.4.11pre2 performance is alleged to have regressed since 2.4.10pre10? - I have not tried 2.4.11pre4, but the report of streaming i/o causing swapping is concerning. Note that the above results were generated using a very simple (and extensible) script. VM developers would do well to spend the 30 seconds writing a similar script, and post results along with proposed VM patches. Cheers Chris - 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/