Messages in this thread | | | From | Alistair John Strachan <> | Subject | Re: 2.6.x Scheduler, preemption and responsiveness - puzzlement | Date | Mon, 12 Jul 2004 02:00:32 +0100 |
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On Sunday 11 July 2004 23:55, Sid Boyce wrote: [snip] > > I've been wondering why this is, I can't remember what the BIOS says > about the hard drives, from memory it looked OK, I think it was set to > AUTO, haven't tried LBA. > # hdparm -d1 /dev/hda > > /dev/hda: > setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted > using_dma = 0 (off) > # hdparm -d1 /dev/hdc > > /dev/hdc: > setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted > using_dma = 0 (off) >
Your BIOS geometry settings are irrelevant. You've just forgotten to enable the correct busmaster DMA driver in your kernel. It looks as though this is an nForce 2 system, so you need to enable "Generic PCI bus-master DMA support", then further down "AMD and nVidia IDE support", in menuconfig. You'll then be able to set DMA on, and this will likely resolve the performance issue.
In .config, the relevant options are
CONFIG_BLK_DEV_IDEDMA_PCI=y CONFIG_BLK_DEV_AMD74XX=y
Hope this helps!
-- Cheers, Alistair.
personal: alistair()devzero!co!uk university: s0348365()sms!ed!ac!uk student: CS/AI Undergraduate contact: 1F2 55 South Clerk Street, Edinburgh. EH8 9PP. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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