linux-kernel - Re: libata - DMA problems ICH7 rev 02

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Date:	Fri, 2 May 2008 22:03:00 +0200
From:	"Jan Niklas Hasse" <jhasse@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: libata - DMA problems ICH7 rev 02

On Fri, May 2, 2008 at 2:58 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > my BIOS didn't support it), but none of them worked (every time my
>  > harddisk is loading my CPU is spammed with IOWait).
>
>  Then you must have a different problem ?

Maybe, but it seems as DMA isn't used. Everytime my hard disk is
reading/writing my system gets very slow. Here's the line when i run
top:

Cpu(s): 12.6%us,  5.4%sy,  0.0%ni,  6.5%id, 74.2%wa,  0.5%hi,  0.8%si,  0.0%st

The thing I mean is "wa".

>  > Output of uname -a and lspci is attached.
>  >
>  > I hope you can help me, very hard to work without DMA.
>
>  Please send the output of "dmesg" after boot

Okay, I pasted it here: http://rafb.net/p/KiWhqE72.html
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