linux-kernel - Re: PATA-disk named sda

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Message-ID: <468E82C8.7060204@rtr.ca>
Date:	Fri, 06 Jul 2007 13:58:32 -0400
From:	Mark Lord <lkml@....ca>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Christoph Pleger <Christoph.Pleger@...uni-dortmund.de>,
	linux-kernel@...r.kernel.org
Subject: Re: PATA-disk named sda

Robert Hancock wrote:
>..
> Currently the DMA, multi-sector mode, etc. are not controllable with 
> hdparm with libata. libata is designed to use the fastest settings 
> possible by default. In a lot of cases this messing with hdparm was only 
> needed because of stupidity with the old IDE code (like DMA not being 
> automatically enabled if the low-level driver was built modular).

Actually, most of the hdparm flags were put there to help test the IDE
subsystem and to help debug the much stranger hardware it had to deal with.

"DMA off by default" was a Linus Torvalds request, to help ensure data safety
with all of the weird and wonderful crap pre-standardization.

Cheers

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