Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264002AbUFSPax (ORCPT ); Sat, 19 Jun 2004 11:30:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264034AbUFSPax (ORCPT ); Sat, 19 Jun 2004 11:30:53 -0400 Received: from dwdmx2.dwd.de ([141.38.3.197]:17446 "HELO dwdmx2.dwd.de") by vger.kernel.org with SMTP id S264002AbUFSPav (ORCPT ); Sat, 19 Jun 2004 11:30:51 -0400 Date: Sat, 19 Jun 2004 15:30:48 +0000 (GMT) From: Holger Kiehl X-X-Sender: kiehl@praktifix.dwd.de To: linux-kernel Subject: SATA performance drop in 2.6.7 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 Content-Length: 1440 Lines: 37 Hello Anybody noticed that with 2.6.7 the performance of SATA disks drops drastically. Right after a boot I get the following with hdparm: Timing buffer-cache reads: 3724 MB in 2.00 seconds = 1861.35 MB/sec Timing buffered disk reads: 166 MB in 3.03 seconds = 54.72 MB/sec It then starts to degrate rapidly: Timing buffer-cache reads: 2560 MB in 2.00 seconds = 1280.19 MB/sec Timing buffered disk reads: 166 MB in 3.01 seconds = 55.14 MB/sec Timing buffer-cache reads: 2164 MB in 2.00 seconds = 1081.08 MB/sec Timing buffered disk reads: 166 MB in 3.02 seconds = 55.05 MB/sec Timing buffer-cache reads: 1700 MB in 2.00 seconds = 850.13 MB/sec Timing buffered disk reads: 146 MB in 3.04 seconds = 48.07 MB/sec Then about 3 minutes after boot it stays at approx. Timing buffer-cache reads: 780 MB in 2.00 seconds = 389.67 MB/sec Timing buffered disk reads: 102 MB in 3.01 seconds = 33.89 MB/sec Controller is a Intel ICH5R and disk is Seagate ST380013AS. With kernel 2.6.6 this does not happen. On another PATA system with 2.6.7 this does not happen, so I assume the problem must be with SATA. Holger PS: Please CC me since I am not subscribed. - 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/