Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261532AbVDNQXy (ORCPT ); Thu, 14 Apr 2005 12:23:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261531AbVDNQXy (ORCPT ); Thu, 14 Apr 2005 12:23:54 -0400 Received: from smtp2.netcologne.de ([194.8.194.218]:33253 "EHLO smtp2.netcologne.de") by vger.kernel.org with ESMTP id S261537AbVDNQXh (ORCPT ); Thu, 14 Apr 2005 12:23:37 -0400 Message-ID: <425E9902.8000804@interia.pl> Date: Thu, 14 Apr 2005 18:23:30 +0200 From: Tomasz Chmielewski User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050322) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: poor SATA performance under 2.6.11 (with < 2.6.11 is OK)? Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3444 Lines: 106 I have a Silicon Image SIL3112A SATA PCI controller + 2x 200GB, 8MB Barracuda drives. The performance under 2.6 kernels is *very* poor (Timing buffered disk reads never more than 20 MB/sec); under 2.4 it runs quite fine (Timing buffered disk reads around 60 MB/sec). Below three hdparm reads on three different liveCDs (kernels 2.6.11.6, 2.4.28, 2.6.11). Kernel 2.6.11.6, Slax 5.0.1 root@slax:~# hdparm -Tt /dev/sda /dev/sdb /dev/sda: Timing cached reads: 1124 MB in 2.00 seconds = 560.68 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 60 MB in 3.10 seconds = 19.38 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device /dev/sdb: Timing cached reads: 1128 MB in 2.00 seconds = 563.80 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 60 MB in 3.09 seconds = 19.39 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Kernel 2.4.28, Slax 4.1.4 root@slax:~# hdparm -Tt /dev/sda /dev/sdb /dev/sda: Timing buffer-cache reads: 1152 MB in 2.00 seconds = 576.00 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported Timing buffered disk reads: 180 MB in 3.01 seconds = 59.80 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported /dev/sdb: Timing buffer-cache reads: 1124 MB in 2.00 seconds = 562.00 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported Timing buffered disk reads: 180 MB in 3.07 seconds = 58.63 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported Kernel 2.6.11, Knoppix 3.8.1: # hdparm -Tt /dev/sda /dev/sdb /dev/sda: Timing cached reads: 1188 MB in 2.00 seconds = 592.61 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 50 MB in 3.09 seconds = 16.19 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device /dev/sdb: Timing cached reads: 1176 MB in 2.00 seconds = 586.92 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 54 MB in 3.19 seconds = 16.94 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device I tested it also with Mandrake 10.2 (it is shipped with 2.6.11 kernel): Timing cached reads was about 100 MB/sec and Timing buffered disk reads was about 10 MB/sec. Another test on Mandrake with 2.6.8.1 kernel - it's the fastest of all test: # hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 1064 MB in 2.00 seconds = 531.81 MB/sec BLKFLSBUF failed: Operation not supported HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported Timing buffered disk reads: 310 MB in 3.02 seconds = 102.49 MB/sec So on three distros with 2.6.11.x kernels (Knoppix, Slax, Mandrake), SATA performance was extremely bad for me. Coincidence, or something SATA-related got borked in 2.6.11? Tomek - 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/