On Thu, 10 Jun 1999, Wolfgang Bornath wrote:
> Out of man hdparm:
> --------------------------------------------------
> -d
> Disable/enable the "using_dma" flag for this drive.
> This option only works with a few combinations of drives and
> interfaces which support DMA and which are known to the
> IDE driver.
>
> This doesn't sound very "optimization"-like.
>
> 1. It is clearly said that -d1 is *not* working with the majority
> of drives and interfaces.
not working != causing problems. On my test system for odd hardware
(486SX, some old ISA IDE controller card (don't ask which chipset)), it
doesn't work, but doesn't cause problems either (SET_DMA: operation not
supported by device), so I assumed that's what they meant. Seems some
chipsets can#t handle it - it'll be made optional in 6.1.
LLaP
bero
