Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759816AbXE3WKk (ORCPT ); Wed, 30 May 2007 18:10:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756221AbXE3WKc (ORCPT ); Wed, 30 May 2007 18:10:32 -0400 Received: from an-out-0708.google.com ([209.85.132.244]:32465 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755529AbXE3WKb (ORCPT ); Wed, 30 May 2007 18:10:31 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=Ubi3+5R0hWhotIdEl3mDx9zpZV+Nebdx+VVtFz67ZlN1YeLq7QGZyCPS/IpS/6ovgTQJ5GWAhyLvbPqx78RSqnrVISAxCd1Zh7pVFuRnHBVTaqkbvwuqNGbpbnnuzT+X8bjBzS9xwOvVZL7aCX6LOFosstf7wZFHIZiRkE/xVxo= Message-ID: <6278d2220705301510y2d81f69eu38fb778d32de05e1@mail.gmail.com> Date: Wed, 30 May 2007 23:10:18 +0100 From: "Daniel J Blueman" To: bzolnier@gmail.com Subject: Compact Flash performance... Cc: linux-ide@vger.kernel.org, "Linux Kernel" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2656 Lines: 77 I have a SanDisk Extreme IV 4GB CF card, capable of 40MB/s read, but am seeing 30MB/s read [1], connected directly to the IDE bus on my ICH8 controller. How can I find out if this would be a timing or configuration issue? On 2.6.20.5 [2], the 120nS timing looks to be right [3], but perhaps no multi-word transfer is hurting here...alas, it can't be enabled with the libata subsystem and 'hdparm -m', so what else? Daniel --- [1] # hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 94 MB in 3.05 seconds = 30.79 MB/sec --- [2] ata7: PATA max UDMA/100 cmd 0x000000000001bc00 ctl 0x000000000001b882 bmdma 0x000000000001b400 irq 17 ata7.00: CFA: SanDisk SDCFX-4096, HDX 4.04, max UDMA/66 ata7.00: 8027712 sectors, multi 0: LBA ata7.00: configured for UDMA/66 ATA: abnormal status 0x7F on port 0x000000000001b807 scsi 6:0:0:0: Direct-Access ATA SanDisk SDCFX-40 HDX PQ: 0 ANSI: 5 SCSI device sdb: 8027712 512-byte hdwr sectors (4110 MB) sdb: Write Protect is off sdb: Mode Sense: 00 3a 00 00 SCSI device sdb: write cache: disabled, read cache: enabled, doesn't support DPO or FUA SCSI device sdb: 8027712 512-byte hdwr sectors (4110 MB) sdb: sdb1 sd 6:0:0:0: Attached scsi removable disk sdb --- [3] # hdparm -I /dev/sdb /dev/sdb: CompactFlash ATA device, with removable media Model Number: SanDisk SDCFX-4096 Serial Number: 116802D2807J3335 Firmware Revision: HDX 4.04 Standards: Supported: 4 Likely used: 4 Configuration: Logical max current cylinders 7964 7964 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 8027712 LBA user addressable sectors: 8027712 device size with M = 1024*1024: 3919 MBytes device size with M = 1000*1000: 4110 MBytes (4 GB) Capabilities: LBA, IORDY(may be)(cannot be disabled) Standby timer values: spec'd by Vendor R/W multiple sector transfer: Max = 4 Current = 0 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: Write cache * CFA feature set -- Daniel J Blueman - 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/