Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 28 Aug 2002 08:51:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 28 Aug 2002 08:51:20 -0400 Received: from atlas.inria.fr ([138.96.66.22]:63145 "EHLO atlas.inria.fr") by vger.kernel.org with ESMTP id ; Wed, 28 Aug 2002 08:51:19 -0400 Message-Id: <200208281255.g7SCtYQg030108@atlas.inria.fr> Content-Type: text/plain; charset=US-ASCII From: Nicolas Turro To: lnz@dandelion.com Subject: DAC960 and cache... Date: Wed, 28 Aug 2002 14:55:34 +0200 X-Mailer: KMail [version 1.3] Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3030 Lines: 69 Hi, I have a Mylex Acceleraid 170 Raid board and i use DAC960 RAID Driver Version 2.4.11 of 11 October 2001 under linux (kernel 2.4.18). Here is the cat /proc/rd/c0/current_status : ***** DAC960 RAID Driver Version 2.4.11 of 11 October 2001 ***** Copyright 1998-2001 by Leonard N. Zubkoff Configuring Mylex AcceleRAID 170 PCI RAID Controller Firmware Version: 6.00-15, Channels: 1, Memory Size: 32MB PCI Bus: 0, Device: 6, Function: 0, I/O Address: Unassigned PCI Address: 0xFC000000 mapped at 0xE0800000, IRQ Channel: 16 Controller Queue Depth: 512, Maximum Blocks per Command: 2048 Driver Queue Depth: 511, Scatter/Gather Limit: 128 of 257 Segments Physical Devices: 0:0 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W Wide Synchronous at 160 MB/sec Serial Number: 344208142992 Disk Status: Online, 71798784 blocks 0:1 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W Wide Synchronous at 160 MB/sec Serial Number: 344207749285 Disk Status: Online, 71798784 blocks 0:2 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W Wide Synchronous at 160 MB/sec Serial Number: 344211046648 Disk Status: Online, 71798784 blocks 0:3 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W Wide Synchronous at 160 MB/sec Serial Number: 344211046660 Disk Status: Online, 71798784 blocks 0:4 Vendor: QUANTUM Model: ATLAS10K2-TY184J Revision: DDD6 Wide Synchronous at 160 MB/sec Serial Number: 161034310612 Disk Status: Online, 35827712 blocks 0:5 Vendor: QUANTUM Model: ATLAS10K2-TY184J Revision: DDD6 Wide Synchronous at 160 MB/sec Serial Number: 161034412602 Disk Status: Online, 35827712 blocks 0:7 Vendor: MYLEX Model: AcceleRAID 170 Revision: 0600 Wide Synchronous at 160 MB/sec Serial Number: Logical Drives: /dev/rd/c0d0: RAID-6, Online, 107483136 blocks Logical Device Initialized, BIOS Geometry: 255/63 Stripe Size: 64KB, Segment Size: 8KB Read Cache Disabled, Write Cache Disabled No Rebuild or Consistency Check in Progress as you see, both read and write cache are disabled. I don't manage to enable them... would you give me any clue ? I also think my filesystem is slow : i used mke2fs -b 4096 -R stride=16 -i 16384 /dev/rd/c0d0p4 but i only get arround 5 Mo/s while doing a tar c KDE | dd of=/dev/null (KDE is a 715 Mo source/compilation tree of KDE) Do you have any clue on how to improve this performance (direct sequencial access on this disk using dd give me around 50 Mo/s) Thx in advance for you help. N. Turro - 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/