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

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Message-ID: <7F38996F7185A24AB9071ED4950AD8C101B3CD2F@swsmsx413.ger.corp.intel.com>
Date:	Tue, 17 Jun 2008 09:05:41 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Krzysztof Oledzki" <ole@....pl>
Cc:	<dotanba@...il.com>, <olel@....pl>, <netdev@...r.kernel.org>
Subject: RE: How can i know if I/OAT is supported?

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
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