netdev - RE: How can i know if I/OAT is supported?

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Message-ID: <Pine.LNX.4.64.0806161754130.2344@bizon.gios.gov.pl>
Date:	Mon, 16 Jun 2008 17:56:48 +0200 (CEST)
From:	Krzysztof Oledzki <ole@....pl>
To:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
cc:	dotanba@...il.com, olel@....pl, netdev@...r.kernel.org
Subject: RE: How can i know if I/OAT is supported?

On Mon, 16 Jun 2008, Sosnowski, Maciej wrote:

> Hi Dotan,
>
>>>> I'm trying to use the I/OAT technology but i don't know if the the
>>>> sent data used this technology.
>>>> Are there are any counters which indicates how many data was sent
> using
>>>> I/OAT?
>>>
>>> for f in /sys/class/dma/*; do echo "$f: bytes=`cat
> $f/bytes_transferred`
>>> count=`cat $f/memcpy_count`" ; done
>>
>> I have the folder /sys/class/dma/, but this folder is empty.
>> What does it mean?
>
> It means that you do not have ioatdma module loaded.
> Simply try: modprobe ioatdma.
> If driver installs correctly, you should see statistics in
> /sys/class/dma/

Are you sure? From my experience it looks like the driver is loaded yet it 
was not able to find a supported device or initialize it.

Best regards,

 				Krzysztof Olędzki