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

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Message-ID: <2f3bf9a60806162340g2368ca13ocb51f44f2d75245c@mail.gmail.com>
Date:	Tue, 17 Jun 2008 09:40:53 +0300
From:	"Dotan Barak" <dotanba@...il.com>
To:	"Krzysztof Oledzki" <olel@....pl>
Cc:	netdev@...r.kernel.org
Subject: Re: How can i know if I/OAT is supported?

I noticed the following message in the /var/log/messages when loading
this module:
Jun 16 18:00:34 slab001 kernel: kobject_add failed for ioatdma with
-EEXIST, don't try to register things with the same name in the same
directory
Jun 16 18:00:34 slab001 kernel:
Jun 16 18:00:34 slab001 kernel: Call Trace:
Jun 16 18:00:34 slab001 kernel:  [<ffffffff8014215c>] kobject_add+0x16e/0x199
Jun 16 18:00:34 slab001 kernel:  [<ffffffff8014229f>] kobject_register+0x20/0x3a
Jun 16 18:00:34 slab001 kernel:  [<ffffffff801abef0>] bus_add_driver+0x5d/0x130
Jun 16 18:00:34 slab001 kernel:
[<ffffffff8014d30d>]__pci_register_driver+0x57/0x7e
Jun 16 18:00:34 slab001 kernel:
[<ffffffff800a39ee>]sys_init_module+0x16a6/0x1857
Jun 16 18:00:34 slab001 kernel:  [<ffffffff8005c28d>] tracesys+0xd5/0xe0
Jun 16 18:00:34 slab001 kernel:

I guess that something is wrong (the module is alread loaded or was
compiled as part of the kernel)

Thanks
Dotan

2008/6/16 Krzysztof Oledzki <olel@....pl>:
>
>
> On Mon, 16 Jun 2008, Dotan Barak wrote:
>
>> Thanks for the fast response.
>>
>>>> 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?
>
> dmesg |grep -i ioatdma
>
> ?
>
> Best regards,
>
>                                Krzysztof Olędzki