From mboxrd@z Thu Jan 1 00:00:00 1970 From: Artem Bityutskiy Subject: Re: Tuning for Compact Flash Date: Mon, 29 Sep 2008 09:54:45 +0300 Message-ID: <48E07BB5.3010701@yandex.ru> References: <48DE2D20.1090703@csr.com> <48DFA291.2030206@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Christer Weinigel , linux-fsdevel@vger.kernel.org To: jim owens Return-path: Received: from smtp.nokia.com ([192.100.105.134]:47317 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751063AbYI2GzR (ORCPT ); Mon, 29 Sep 2008 02:55:17 -0400 In-Reply-To: <48DFA291.2030206@hp.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: jim owens wrote: > Christer Weinigel wrote: >> >> I have a Thinkpad X40 that I'd like to replace the Hitachi hard driv= e=20 >> on. The drive is 1"8 with a normal 2"5 PATA disk connector on the=20 >> side and such disks are not manufactured any more, so I went out and= =20 >> bought a Compact Flash adapter and a Transcend 133X 32 GByte Compact= =20 >> Flash. >> >> I installed Fedora 9 on the Compact Flash, with a small boot partiti= on=20 >> and then one large encrypted LVM partition where I put the swap=20 >> partition and an ext3 file system. This turned out to be bog slow,=20 >> write speed to the ext3 file system seem to be about 1MByte/s which = is=20 >> just horrible. Since Transcend claims 45MByte/s read bandwidth and=20 >> 16MByte/s write bandwidth, this seems much too low. >=20 > CF is not an SSD. A CF is designed and spec'd to store large images. > Neither CF nor USB thumb drives are intended as a primary system > hard drive. They work great for transferring data between machines > but no filesystem or tuning will make them perform with the same > characteristics you expect of your primary hard drive. And I won't be surprised if they are optimized for FAT. Many SD cards are - the first N sectors are often faster there, and in case of large cards they may be mapped to SLC NAND, while the rest is mapped to MLC NAND. I may suspect that CF may do something similar. --=20 Best Regards, Artem Bityutskiy (=D0=90=D1=80=D1=82=D1=91=D0=BC =D0=91=D0=B8=D1=82=D1=8E= =D1=86=D0=BA=D0=B8=D0=B9) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html