From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Richter Subject: Re: slow external firewire drive Date: Sun, 30 Oct 2005 08:47:37 +0100 Message-ID: <43647A99.60607@s5r6.in-berlin.de> References: <20051027015655.GC14010@toucan.gentoo.org> <43608663.7020103@s5r6.in-berlin.de> <20051027124154.GD14010@toucan.gentoo.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from einhorn.in-berlin.de ([192.109.42.8]:46278 "EHLO einhorn.in-berlin.de") by vger.kernel.org with ESMTP id S932773AbVJ3Hs6 (ORCPT ); Sun, 30 Oct 2005 02:48:58 -0500 In-Reply-To: <20051027124154.GD14010@toucan.gentoo.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: Eric Edgar Eric Edgar wrote on 2005-10-27: > I have tried the different serialize_io option and it didnt help much. > > it is a s400 based card. > > Here are the numbers off the 2 biggest chips on the card. > > belkin f5u503 > > CHIP 1 > tsb12lv26 > ca-22a752t > f731652a > > CHIP 2 > 22any0ct > tsb41ab3 ... I have not heard anything negative about Belkin hardware so far. Also, TI lists only one erratum concerning the TSB41AB3 which is not related to the low throughput. The culprit is probably either the Maxtor FireWire enclosure (PHY, link layer controller & IDE bridge, firmware, or perhaps even the included HDD) or our software... >>> Vendor: Maxtor Model: 1394 storage Rev: v1.3 >>> Type: Direct-Access-RBC ANSI SCSI revision: 04 >>>SCSI device sda: 156355584 512-byte hdwr sectors (80054 MB) ... >>>hdparm -tT /dev/sda >>> >>>/dev/sda: >>>Timing cached reads: 644 MB in 2.01 seconds = 320.40 MB/sec >>>Timing buffered disk reads: 8 MB in 3.09 seconds = 2.59 MB/sec ... >>>2.6.14-rc4 >>> >>>I dont seem to see any error messages ... just bad performance. Maxtor's currently available enclosures are noticeable slower than comparable products: http://www.macworld.com/2005/10/reviews/firewiremain/index1.php Although according to these application test on OS X, they should not be as extremely slow as hdparm measures. I remember though that Maxtor FireWire drives have been used under Linux before. Alas www.linux1394.org and its hardware compatibility list are offline again at the moment. That is all I can say about it so far. -- Stefan Richter -=====-=-=-= =-=- ====- http://arcgraph.de/sr/