On Fri, Aug 01, 2003 at 11:00:56PM +0200, Wayne Gemmell wrote: > running hdparm /dev/hdc yields > using_dma = 0 (off)
The kernel didn't enable DMA on the interface the drive is connected to. > while running hdparm -i /dev/hdc yields > DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 Not relevant... you care about the NEXT line, the one that reports available UDMA modes. > and hdparm -I /dev/hdc outputs > DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 The BIOS put the drive into UDMA5 (ATA100), which the drive supports. > Now when I run hdparm -d1 /dev/hdc I get > /dev/hdc: > setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted > using_dma = 0 (off) The kernel you're using doesn't have support for your IDE chipset. This is why the kernel didn't enable DMA on its own. Using hdparm to force DMA is a bad, bad, BAD idea. The kernel usually has very good reasons for not enabling it. -- Marc Wilson | You are only young once, but you can stay immature [EMAIL PROTECTED] | indefinitely. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
