From owner-freebsd-arm@freebsd.org  Wed Jul 29 11:00:19 2015
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Date: Wed, 29 Jul 2015 13:01:43 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Svatopluk Kraus <onwahe@gmail.com>
CC: Jia-Shiun Li <jiashiun@gmail.com>, 
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Subject: Re: [RPI-B] [HEADS UP] DWC OTG TX path optimisation for 11-current
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On 07/29/15 12:42, Svatopluk Kraus wrote:
> On Wed, Jul 29, 2015 at 12:31 PM, Hans Petter Selasky <hps@selasky.org> wrote:
>> On 07/29/15 12:08, Svatopluk Kraus wrote:
>>>
>>> On Tue, Jul 28, 2015 at 9:36 AM, Hans Petter Selasky <hps@selasky.org>
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Can you test this:
>>>>
>>>> https://svnweb.freebsd.org/changeset/base/285935
>>>>
>>>
>>> I'm hunting some strange behaviour slowdowning my set RPI2 - usb3 hub
>>> - usb3 disk during buildworld, but I have noticed the following:
>>>
>>> make -j6 buildworld
>>>
>>> before r285935 -> 60145.29 real    350932.67 user     36402.54 sys
>>> after r285935 -> 67831.38 real    196310.43 user     19135.73 sys
>>>
>>> The kernel before r285935 was day or two older.
>>>
>>> These are just one-run times, however the difference is quite big. The
>>> change r285935 could influence the thing I'm investigating so it's
>>> worse now, but still ...
>>>
>>
>> Regarding build times you should also take "r285068" into account.
>>
>
> Yes, I know about that. The r285068 was applied in both kernels.
>

Hi,

The "sys" and "user" times are down. While the "real" time is up. That 
means more sleeping??? There is a knob in "hw.usb.umass.throttle" which 
you can set to slow down the disk access. Maybe it's reading files 
faster than before and then starts swapping?

--HPS