Re: Disk Performance

From: Rik van Riel (riel@conectiva.com.br)
Date: Fri Nov 09 2001 - 17:57:07 EST

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On Fri, 9 Nov 2001, Erik Andersen wrote:
> On Fri Nov 09, 2001 at 08:31:32PM -0200, Rik van Riel wrote:
> > On Fri, 9 Nov 2001, Ben Israel wrote:
> >
> > > Why does my 40 Megabyte per second IDE drive, transfer files at best
> > > at 1-2 Megabytes per second?

> > # hdparm -d1 /dev/hda
> >
> > (not enabled by default because it corrupts data with some
> > old chipsets and/or disks)
>
> But wouldn't it make more sense to enable DMA by default, except
> for a set of blacklisted chipsets, rather then disabling it for
> everybody just because some older chipsets are crap?

The kernel does this, but only if CONFIG_IDEDMA_AUTO
is enabled ...

regards,

Rik

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