linux-kernel - Re: SATA kernel-buffered read VERY slow (not raid, Promise TX300 card); 2.6.23.1(vanilla)

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Message-ID: <47813926.6010908@tlinx.org>
Date:	Sun, 06 Jan 2008 12:25:10 -0800
From:	Linda Walsh <lkml@...nx.org>
To:	Robert Hancock <hancockr@...w.ca>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org
Subject: Re: SATA kernel-buffered read VERY slow (not raid, Promise TX300
 card); 2.6.23.1(vanilla)

Robert Hancock wrote:
>
> If this is a Seagate, I believe that they don't have AAM enabled on 
> any of their newer drives (something about a lawsuit for patent 
> infringement on that feature, or something). Quite likely they don't 
> support that power management command, either.
--
    Do you have a source for this -- haven't heard of such a conflict -- 
besides, doesn't
ATA-7 require some of those functions?  Given the trend toward 
power-saving and
quieter (also usually less vibration)  hard disks, I strongly disbelieve 
Seagate would
remove those features -- especially since they are mentioned on 
Seagate's drive
information page as being supported features.



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