Was Collecting SBUs now, Fast compile engines

Ian Molton spyro at armlinux.org
Sat Jun 8 03:51:16 PDT 2002

On Sat, 08 Jun 2002 09:54:36 +0200
Björn Lindberg <d95-bli.no at spam.nada.kth.se> wrote:

> > use hdparm to turn off UDMA and use PIO 4.
> Oh, I see now. But that is not the result of lower HDD speed per se,
> but rather that the processor has to spend time doing HDD reads when
> not using DMA (Direct Memory Access), whereas with DMA all processor
> time can be spent on the actual compiling.
> When I was talking about HDD speed, I meant SCSI vs IDE, or 7200rpm vs
> 5400rpm, etc. Ie the way HDD speed affects compile times /directly/.

No, I meant the data transfer speed.

PIO uses negligible time at PIO4 really.

if you still dont believe me, try UDMA33 compared to 133.
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