linux-kernel - Re: Extremely slow IO with a PCMCIA CompactFlash adapter

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Date:	Sun, 2 Aug 2009 15:38:45 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Jack Byer <ojbyer@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Extremely slow IO with a PCMCIA CompactFlash adapter

On Saturday 01 August 2009 16:02:22 Jack Byer wrote:
> I have an old digital camera that stores its pictures on a 340 MB IBM 
> microdrive. I am trying to transfer to pictures from the camera to my 
> computer but can not find the special non-standard USB cable. The 
> camera did come with a CompactFlash to PCMCIA adapter, so tried 
> connecting it to my laptop. I was able to install the correct modules 
> and mount the drive, but accessing it is very slow (5.0 kBps read / 
> 3.8 kBps write). Is this expected behavior? Is there any setup I am 
> missing that would make this faster?

Get 2.6.31-rc5 kernel.

Set:

	CONFIG_IDE=m
	CONFIG_BLK_DEV_IDECS=m

in the kernel config.

Build, install, reboot.

Load ide-cs module.

Enjoy the speed increase using /dev/hda.

You may try "hdparm -c1 /dev/hda" for an extra enjoyment.
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