From: Larry Finger <Larry.Finger@lwfinger.net>
To: Ian Jeffray <ian@emobix.co.uk>
Cc: linux-wireless@vger.kernel.org
Subject: Re: r8712u driver - on ARM
Date: Wed, 12 Oct 2011 12:28:09 -0500 [thread overview]
Message-ID: <4E95CE29.2070106@lwfinger.net> (raw)
In-Reply-To: <4E95B299.8050006@emobix.co.uk>
On 10/12/2011 10:30 AM, Ian Jeffray wrote:
> On 02/10/2011 00:24, Ian Jeffray wrote:
>> On 01/10/2011 20:24, Larry Finger wrote:
>>
>>> BTW, netperf shows that r8712u can transmit at ~80 and receive at ~60
>>> Mbps when connected to a 270 Mbps AP. As Realtek lists this as capable
>>> of 150 Mbps, x86_64 is getting the max transmit rate that we might
>>> expect.
>>
>> On x86 32bit, I get a sustained 94Mbps transmit to a 300Mbps AP, which
>> seems pretty good - why I'm keen to get this to work for my ARM target.
>
> Larry, just a little more info on this issue, FYI.
>
> It would seem the problem is certainly specific to the 'Inventra' mUSB
> host found in recent TI ARM products and ADI Blackfin devices.
>
> I have added a PCI express NEC USB 2.0 host controller card to my ARM
> Cortex A8 system, and the r8712u devices work just fine when connected
> via that host controller. (Albeit only at 20MBps rate, but that's
> because the host controller is rather poor in general).
>
> We have now raised this problem with TI USB experts.
Thanks for the update. Good luck with finding the real problem and let me know
if I can be of help.
Larry
next prev parent reply other threads:[~2011-10-12 17:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-27 15:36 r8712u driver - on ARM Ian Jeffray
2011-09-27 16:24 ` Larry Finger
2011-09-30 18:39 ` Ian Jeffray
2011-09-30 19:06 ` Christian Lamparter
2011-10-01 0:51 ` Larry Finger
2011-10-01 16:01 ` Larry Finger
2011-10-01 16:22 ` Christian Lamparter
2011-10-01 17:52 ` Larry Finger
2011-10-01 18:01 ` Christian Lamparter
2011-10-01 18:10 ` Ian Jeffray
2011-10-01 18:49 ` Larry Finger
2011-10-01 18:54 ` Christian Lamparter
2011-10-01 19:24 ` Larry Finger
2011-10-01 23:24 ` Ian Jeffray
2011-10-12 15:30 ` Ian Jeffray
2011-10-12 17:28 ` Larry Finger [this message]
2011-10-01 17:00 ` Ian Jeffray
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