From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 24 Jan 2001 11:10:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 24 Jan 2001 11:09:50 -0500 Received: from tstac.esa.lanl.gov ([128.165.46.3]:28374 "EHLO tstac.esa.lanl.gov") by vger.kernel.org with ESMTP id ; Wed, 24 Jan 2001 11:09:39 -0500 From: Steven Cole Reply-To: scole@lanl.gov Date: Wed, 24 Jan 2001 09:08:57 -0700 X-Mailer: KMail [version 1.1.99] Content-Type: text/plain; charset="us-ascii" Cc: Marcelo Tosatti , lkml To: Jens Axboe In-Reply-To: <01012208583400.01639@spc.esa.lanl.gov> <01012313294400.01045@spc.esa.lanl.gov> <20010123215419.A7435@suse.de> In-Reply-To: <20010123215419.A7435@suse.de> Subject: Re: 2.4.1pre8 slowdown on dbench tests MIME-Version: 1.0 Message-Id: <01012409085700.02477@spc.esa.lanl.gov> Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 23 January 2001 13:54, Jens Axboe wrote: > > Thanks! Could I talk you into doing one last run? pre8 with > include/linux/elevator.h having these values set for > ELEVATOR_LINUS: > Here are two sets of dbench 48 runs with that mod. I can't explain why the second set is faster. The second set was performed with no reboot after the first set. The individual runs were performed with no wait in-between. Steven 2.4.1-pre8 with changes to elevator.h, first run set average: 9.52569 MB/sec Throughput 9.51356 MB/sec (NB=11.892 MB/sec 95.1356 MBit/sec) Throughput 9.43096 MB/sec (NB=11.7887 MB/sec 94.3096 MBit/sec) Throughput 9.54195 MB/sec (NB=11.9274 MB/sec 95.4195 MBit/sec) Throughput 9.61631 MB/sec (NB=12.0204 MB/sec 96.1631 MBit/sec) 2.4.1-pre8 same as above, second run set average: 10.1621 MB/sec Throughput 10.1236 MB/sec (NB=12.6546 MB/sec 101.236 MBit/sec) Throughput 10.0304 MB/sec (NB=12.5381 MB/sec 100.304 MBit/sec) Throughput 10.1844 MB/sec (NB=12.7305 MB/sec 101.844 MBit/sec) Throughput 10.3099 MB/sec (NB=12.8873 MB/sec 103.099 MBit/sec) Here is the change I made to elevator.h which you suggested: --- elevator.h.orig Wed Jan 24 07:12:00 2001 +++ elevator.h Wed Jan 24 07:12:47 2001 @@ -94,8 +94,8 @@ #define ELEVATOR_LINUS \ ((elevator_t) { \ - 8192, /* read passovers */ \ - 16384, /* write passovers */ \ + 1000000, /* read passovers */ \ + 2000000, /* write passovers */ \ \ elevator_linus_merge, /* elevator_merge_fn */ \ elevator_linus_merge_cleanup, /* elevator_merge_cleanup_fn */ \ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/