From: Willy Tarreau <w@1wt.eu>
To: Mark Lord <liml@rtr.ca>
Cc: Jeff Garzik <jeff@garzik.org>,
Daniel J Blueman <daniel.blueman@gmail.com>,
bzolnier@gmail.com, linux-ide@vger.kernel.org,
Linux Kernel <linux-kernel@vger.kernel.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: Compact Flash performance...
Date: Sat, 2 Jun 2007 07:10:06 +0200 [thread overview]
Message-ID: <20070602051005.GQ943@1wt.eu> (raw)
In-Reply-To: <465F4FA2.8030200@rtr.ca>
On Thu, May 31, 2007 at 06:43:46PM -0400, Mark Lord wrote:
> Jeff Garzik wrote:
> >Mark Lord wrote:
> >>Some cards may perform better when their "memory" interface is used
> >>instead of the "I/O" interface, or vice-versa. I'm not sure which
> >>of the two methods was selected by libata (probably the "memory"
> >>interface).
> >
> >I am very CF-ignorant. How does libata select a memory or I/O interface
> >on a CF device?
>
> Right. Usually we cannot select them, as it's the wires between
> the ATA chipset (motherboard) and the CFCARD that determine this.
CF cards support 3 modes (MEM, I/O and True IDE), and neither MEM nor I/O
modes can talk IDE. Most often, the PIN 9 is simply shorted to the ground
at the connector to set the card in True IDE mode, which makes it emulate
a standard IDE disk.
Cheers,
Willy
next prev parent reply other threads:[~2007-06-02 5:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-30 22:10 Compact Flash performance Daniel J Blueman
2007-05-30 22:31 ` Lee Revell
2007-05-31 9:18 ` Daniel J Blueman
2007-05-30 22:56 ` Bartlomiej Zolnierkiewicz
2007-05-31 3:24 ` Mark Lord
2007-05-31 9:22 ` Daniel J Blueman
2007-05-31 12:22 ` Mark Lord
2007-05-31 17:25 ` Daniel J Blueman
2007-05-31 20:54 ` Mark Lord
2007-05-31 21:39 ` Daniel J Blueman
2007-05-31 22:33 ` Mark Lord
2007-05-31 22:35 ` Mark Lord
2007-05-31 22:37 ` Jeff Garzik
2007-05-31 22:43 ` Mark Lord
2007-06-02 5:10 ` Willy Tarreau [this message]
2007-05-31 23:47 ` Daniel J Blueman
2007-05-31 22:40 ` Mark Lord
2007-05-31 23:26 ` Jeff Garzik
[not found] <fa.XmtWMJk5gwBC00HJh+5O62Vx8eA@ifi.uio.no>
[not found] ` <fa.fl4+oXGwE5VC39h2DLdFoBUbqV4@ifi.uio.no>
[not found] ` <fa.+cW0LouEqSiZ6zrmBDeBJxRjPTg@ifi.uio.no>
[not found] ` <fa.PM7erd/Gm1gq8ZshwTBJwux7o6o@ifi.uio.no>
[not found] ` <fa.MYVClL+Q9g/jFTcUNWOeysiV0Ig@ifi.uio.no>
[not found] ` <fa.Q4zXu+xtMAT5H5vbl/zgxZk/Ivo@ifi.uio.no>
2007-06-01 0:00 ` Robert Hancock
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