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Subject: Re: High CPU usage for disk I/O while DMA is enabled
From: Rafael Pereira <gotrooted@pop.com.br>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Nesimi Buelbuel <nesimi.buelbuel@gmx.de>
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Date: Sun, 25 Jul 2004 12:42:36 -0300
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On Sun, 2004-07-25 at 12:25, Nesimi Buelbuel wrote:

> actually I have compiled it into the Kernel.
> 
> here is a grep from all DMA related Kernel options:
> 
> CONFIG_GENERIC_ISA_DMA=y
> CONFIG_BLK_DEV_IDEDMA_PCI=y
> # CONFIG_BLK_DEV_IDEDMA_FORCED is not set
> CONFIG_IDEDMA_PCI_AUTO=y
> CONFIG_IDEDMA_ONLYDISK=y
> CONFIG_BLK_DEV_ADMA=y
> CONFIG_BLK_DEV_IDEDMA=y
> # CONFIG_IDEDMA_IVB is not set
> CONFIG_IDEDMA_AUTO=y

What is your motherboard ???
You must enable in .config the right IDE busmaster for your mobo.


Rafael.