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

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Date:	Tue, 17 Jun 2008 11:13:08 +0300
From:	"Dotan Barak" <dotanba@...il.com>
To:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
Cc:	"Krzysztof Oledzki" <ole@....pl>, olel@....pl,
	netdev@...r.kernel.org
Subject: Re: How can i know if I/OAT is supported?

2008/6/17 Sosnowski, Maciej <maciej.sosnowski@...el.com>:
> Krzysztof Oledzki wrote:
>> 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
>
> Yes, that's why I have written "if driver installs correctly"
> (sorry, I should have put it "initializes correctly").
> Anyway, to make it clear, empty /sys/class/dma/ means that
> either ioatdma is not loaded at all or its initialization failed.
>
> Regards,
> Maciej

O.k., so now I/OAT is not compiled as part of the kernel and i'm
loading the updated driver but still
i don't see any file in this folder...
(the module is loaded)

How can i know if my chipset/BIOS/CPU support I/OAT?

thanks
Dotan