Re: Inspiron 8000 IDE bus speed
On Tue, 2002-01-15 at 13:08, Daniel Pittman wrote:
> Maybe Marcello, the 2.4 maintainer, would take a cosmetic patch if you
> sent one. :)
Hmmm...maybe...
> Given that you are using a laptop harddrive[1], you are /very/
unlikely
> to see any real performance difference.
Naturally :-)
>
> Performance on a single hard disk is dominated by seek time for
> everything except streaming media.
>
> Running the data transfer faster, such as UDMA-66 vs UDMA-33,
generally
> doesn't make a real difference to any situation using IDE disks
because
> one disk can't saturate the IO bus and two disks still lock each other
> out, competing for the bandwidth.
>
> So, it really doesn't make much difference. If you are using a UDMA,
or
> even a DMA, mode, there is little gain to be made by pushing it
harder.
> There is a (miniscule) theoretical gain using DMA over PIO, but it's
not
> really measurable.
>
> Enabling 32-bit host transfers and unmasking of the IRQ with hdparm,
> when it works[2], can make a difference, though -- especially the
later
> of those two.
Maybe some time when I'm feeling adventurous.
Thanks for the info.
--
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* Simon Wong *
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