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: <477DA05F.4080503@shaw.ca>
Date:	Thu, 03 Jan 2008 20:56:31 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Linda Walsh <lkml@...nx.org>
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)

Linda Walsh wrote:
> Robert Hancock wrote:
>>
>> Looks like the drive reports ERR/ABRT (command aborted), meaning it 
>> likely doesn't support those commands.
>>
> ---
>    Except the PATA version of the drive does (same capacity, & other 
> specs).  Seagate would
> disable "advanced" features for SATA but leave them for the older 
> technology?  Possible,
> but doesn't seem likely.

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.
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