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

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Date:	Mon, 12 May 2008 17:55:42 +0200
From:	"Jan Niklas Hasse" <jhasse@...il.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: libata - DMA problems ICH7 rev 02

On Sat, May 3, 2008 at 4:38 AM, Robert Hancock <hancockr@...w.ca> wrote:
>  This is expected. IOWait just means the system is blocked waiting for IO
> and has nothing else to do. It does not mean that DMA is not working.
>
>  [...]
>
>  Looks like you are using DMA:
>
>  ata1.00: configured for UDMA/100
>  ata1.01: configured for UDMA/33
>

Hm.. strange. But the problem is that my system slows down
nevertheless (sometimes the mouse cursor stops moving for a short time
or all my programs don't react). How can i find out what is causing
the problem?

Here I was creating a DVD with dvdauthor which was copying some big
video files. It was nearly impossible to use a web browser, although
CPU load seems only to be 12.7%.

top - 20:33:08 up  4:58,  2 users,  load average: 2.94, 2.81, 2.49
Tasks: 134 total,   2 running, 132 sleeping,   0 stopped,   0 zombie
Cpu(s):  5.0%us,  7.7%sy,  0.0%ni, 16.2%id, 70.1%wa,  0.3%hi,  0.8%si,  0.0%st
Mem:   1019568k total,   996316k used,    23252k free,     1148k buffers
Swap:  2916344k total,    83892k used,  2832452k free,   325284k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2609 root      15  -5     0    0    0 S    6  0.0   6:41.67 kcryptd
 6344 root      20   0  543m 129m  10m S    3 13.0   6:33.63 Xorg
27062 jhasse    20   0 23164 6424 1176 D    3  0.6   0:11.98 dvdauthor
 6891 jhasse    20   0  208m  18m 8956 S    2  1.9   3:13.41 transmission
27173 jhasse    20   0  263m  24m  12m S    2  2.4   0:00.66 gnome-terminal
  195 root      20   0     0    0    0 S    1  0.0   0:00.14 pdflush

Another example: When I'm burning a disc and at the end, when my drive
finishes the disc (and makes those noises) the computer freezes untill
the CD is finished and ejected (about 3 seconds).

I hope it's the right place to ask here at the mailing list and thanks
for your help so far.
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