BLFS from host?

Simon Geard delgarde at ihug.co.nz
Fri Nov 15 00:55:20 PST 2002


Ian Molton wrote:

> On Thu, 14 Nov 2002 15:21:01 -0000
> "Matthew Burgess" <ca9mbu at eos.sunderland.ac.uk> wrote:
> 
> > 
> > You might want to install hdparm if you haven't already (I'm
> > assuming you've got an IDE drive that supports DMA).  This should
> > noticably increase I/O throughput.
> 
> No it wont. installing it alone does nothing. you might need to
> actually use it, but most drives default to DMA on.

It's a kernel option, actually - "Use PCI DMA by default when
available". It also defaults to no, to avoid damage to flaky hardware.
If you enable that option when building the kernel, the drive should
default to using DMA; otherwise you'll need to enable it with hdparm.

Simon.
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