linux-kernel - Re: Compact Flash performance...

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Message-ID: <465E3FF0.9010709@rtr.ca>
Date:	Wed, 30 May 2007 23:24:32 -0400
From:	Mark Lord <lkml@....ca>
To:	Daniel J Blueman <daniel.blueman@...il.com>
Cc:	bzolnier@...il.com, linux-ide@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Compact Flash performance...

Daniel J Blueman wrote:
> I have a SanDisk Extreme IV 4GB CF card, capable of 40MB/s read, but
> am seeing 30MB/s read [1], connected directly to the IDE bus on my
> ICH8 controller.
> 
> How can I find out if this would be a timing or configuration issue?
> On 2.6.20.5 [2], the 120nS timing looks to be right [3], but perhaps
> no multi-word transfer is hurting here...alas, it can't be enabled
> with the libata subsystem and 'hdparm -m', so what else?

Please post the output from "hdparm --Istdout /dev/sdb" for this card.

Thanks
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