From mboxrd@z Thu Jan 1 00:00:00 1970 From: Damon Lynch Subject: ExpressCard compact flash card very slow Date: Tue, 22 Feb 2011 19:01:13 -0600 Message-ID: <4D645C59.8090406@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-wy0-f174.google.com ([74.125.82.174]:44500 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751608Ab1BWBBQ (ORCPT ); Tue, 22 Feb 2011 20:01:16 -0500 Received: by wyg36 with SMTP id 36so381171wyg.19 for ; Tue, 22 Feb 2011 17:01:15 -0800 (PST) Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-ide@vger.kernel.org When using a Lexar ExpressCard CompactFlash (CF) reader in an ExpressCard slot, the speed of this high speed device is very slow (relatively speaking, of course).It performs at ~28MB/s instead of ~80MB/s it should be with a fast CompactFlash card. This is the product: http://www.lexar.com/products/lexar-professional-expresscard-compactflash-cf-reader?category=213 The CF card can run at UDMA/133, but is set to run at UDMA/33. $dmesg [ 1.687119] scsi0 : pata_jmicron [ 1.692480] scsi1 : pata_jmicron [ 1.692523] ata1: PATA max UDMA/100 cmd 0x4020 ctl 0x4014 bmdma 0x4000 irq 19 [ 1.692525] ata2: PATA max UDMA/100 cmd 0x4018 ctl 0x4010 bmdma 0x4008 irq 19 [ 1.870088] usb 1-6: new high speed USB device using ehci_hcd and address 3 [ 1.890676] ata1.00: CFA: TRANSCEND, 20091215, max UDMA/133 [ 1.890678] ata1.00: 125059072 sectors, multi 0: LBA [ 1.890681] ata1.00: limited to UDMA/33 due to 40-wire cable [ 1.930831] ata1.00: configured for UDMA/33 [ 1.930984] scsi 0:0:0:0: Direct-Access ATA TRANSCEND 2009 PQ: 0 ANSI: 5 [ 1.931132] sd 0:0:0:0: [sda] 125059072 512-byte logical blocks: (64.0 GB/59.6 GiB) [ 1.931144] sd 0:0:0:0: Attached scsi generic sg0 type 0 [ 1.931181] sd 0:0:0:0: [sda] Write Protect is off [ 1.931184] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 1.931371] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 1.932525] sda: sda1 [ 1.932904] sd 0:0:0:0: [sda] Attached SCSI disk $sudo lspci -vvv -xxx 05:00.0 IDE interface: JMicron Technology Corp. JMB368 IDE controller (prog-if 85 [Master SecO PriO]) Subsystem: JMicron Technology Corp. JMB368 IDE controller Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR-