linux-kernel - Re: PATA-disk named sda

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Message-Id: <200707062047.10265.bzolnier@gmail.com>
Date:	Fri, 6 Jul 2007 20:47:10 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Mark Lord <lkml@....ca>
Cc:	Robert Hancock <hancockr@...w.ca>,
	Christoph Pleger <Christoph.Pleger@...uni-dortmund.de>,
	linux-kernel@...r.kernel.org
Subject: Re: PATA-disk named sda

On Friday 06 July 2007, Mark Lord wrote:
> 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.

Exactly as Mark says.

I just want to add that "DMA off by default" hasn't been a case for a long
time now and since 2.6.21 the config option for "DMA on by default" is also
finally gone (to make a long story short: this was the best way to fix some
bugs while not causing regressions, not to mention that it was defaulting
to Y for years).

Thanks,
Bart
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