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Date: Wed, 15 Jul 2015 17:58:03 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Daisuke Aoyama <aoyama@peach.ne.jp>, 
 Andreas Andersson <aandersson@tappsi.co>, freebsd-arm@freebsd.org
Subject: Re: Performance issues with raspberry pi 2
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On 05/18/15 00:02, Daisuke Aoyama wrote:
>
> Previous subset does not work correctly in ratecheck.
> I don't know a reason but same code from ODROID-C1 version works.
> I re-create the patch as dwc_otg-rpi2-20150518.patch.
>
> http://www.peach.ne.jp/archives/rpi/patch/dwc_otg-rpi2-20150518.patch

Hi,

I've finally had time to look at your patch, and it has some clever new 
ideas to optimise the DWC OTG performance. I like it and will do some 
work to integrate your patches like promised this week. It might be too 
late for the coming 10.x release, but will for sure hit 10-stable when 
the next 10.x is out. Thank you!

One question though: Are the WMB's and RMB's strictly needed? Isn't the 
I/O memory mapped coherently?

Did you consider enabling the TXFIFOEMPTY IRQs instead of spinning?

--HPS