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

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Date:	Tue, 17 Jun 2008 14:20:54 +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>:
> 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

It seems that my server doesn't support I/OAT
:(

this explain many things....

thanks allot for your help
Dotan