From mboxrd@z Thu Jan 1 00:00:00 1970 From: Naoki Subject: Poor sequential write performance. Date: Thu, 07 Nov 2002 19:59:55 +0900 Message-ID: <3DCA47AB.8060008@valuecommerce.ne.jp> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: reiserfs-list@namesys.com Why ohh why.. I have an old RedHat 6.2 box with 2.4.2 kernel and an IDE disk. When I 'wc' a file of about 100,000 text lines it take under a second. On my new RH 8.0 box with 2.4.18-14 kernel and SCSI disk it takes three seconds. This is bizzare. Yes they are under the same load etc etc. They are both mounted with noatime / nodirtime. What on earth is going on??? Any help most appreciated. Look at this - New machine : time wc files* 6421 69607 894412 files 38806 420590 5394914 files.1 45227 490197 6289326 total real 0m3.059s user 0m2.543s sys 0m0.064s Old machine : time wc files* 18628 201841 2597321 files 46603 505811 6501130 files.1 37122 402985 5201388 files.2 102353 1110637 14299839 total 0.25user 0.04system 0:00.38elapsed 76%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (115major+19minor)pagefaults 0swaps