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

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Message-ID: <7F38996F7185A24AB9071ED4950AD8C101B3CE45@swsmsx413.ger.corp.intel.com>
Date:	Tue, 17 Jun 2008 10:05:17 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Dotan Barak" <dotanba@...il.com>
Cc:	"Krzysztof Oledzki" <ole@....pl>, <olel@....pl>,
	<netdev@...r.kernel.org>
Subject: RE: How can i know if I/OAT is supported?

Dotan Barak wrote:
> 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

You should check your PCI devices and see if you can find DMA Engine there.
One of following vendor:device should be there ("lspci -n") 
if your chipset supports I/OAT: 8086:1a38, 8086:360b, 8086:65ff, 8086:402f.

Apart from that, if the driver finds I/OAT device, 
you should see "Intel(R) I/OAT DMA Engine found" kernel message.

Regards,
Maciej
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