* SIS 5513/IBM Deskstar HDIO_SET_DMA Operation not permitted?
@ 2001-04-03 16:09 Rob Landley
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From: Rob Landley @ 2001-04-03 16:09 UTC (permalink / raw)
To: linux-kernel
2.2 allowed me to set DMA on an SIS 5513 using an IBM
Deskstar 40 gig IDE. 2.4 goes "Operation not
permitted" when I try it.
Why?
I hit it with ide0=ata66 in lilo, and it sped up from
3 megs/sec to 5 megs/second, but I used to get 12.
hdparm /dev/hda still says I'm not using DMA.
I realise I'm doing dangerous stuff here to get the
performance back. I'm just curious why it's not doing
it for me. (Is there a known problem I should be
worried about?)
Let's see, ide0=dma,ata66... right? Should I be
really really worried about my data integrity if I do
this? It never had a problem under 2.2...
Rob
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