How to enable DMA on a SATA drive (was dd backup unbelievably slow on SATA laptop)

[Lonni J Friedman]

On 1/4/07, Matt Davey <mcdavey at mrao.cam.ac.uk> wrote:
> On Thu, 2007-01-04 at 10:09 -0700, Kevin Kempter wrote:
> > On Thursday 04 January 2007 09:23, Lonni J Friedman wrote:
> > > On 1/4/07, Kevin Kempter <kevin at kevinkempterllc.com> wrote:
> > >
> > > > I find that my avg speed in 1.7m/sec which leads to a full backup time of
> > > > around 16-17 hours.
> > > >
> [...]
> > >
> > > It sounds like DMA is disabled.
> > >
> [...]
> > All;
> >
> > How can I enable DMA on a SATA drive in a laptop?
>
> hdparm -d1 <device>

I've yet to run across any SATA controllers which allow one to enable
or disable DMA support via hdparm.

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L. Friedman                                    netllama at gmail.com
LlamaLand                       http://netllama.linux-sxs.org