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Subject: Re: What is wrong with FreeBSD and USB Support
To: Markus Rechberger <mrechberger@gmail.com>
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Cc: freebsd-multimedia@freebsd.org
From: Hans Petter Selasky <hps@selasky.org>
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Date: Mon, 6 Mar 2017 12:30:36 +0100
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Hi,

On 03/06/17 11:53, Markus Rechberger wrote:
> 1. slow usb control messages - did you already noticed that?

 From what I can see no USB control transfer completed no later than 
1.555 milliseconds. I loaded the numbers in the trace into a spreadsheet 
and got the attached distribution.

This is not slow. What times do you expect?

The fastest XHCI can do is ~ 0.125 ms and from the analysis is appears 
that the USB device is NAKing a little bit, causing the extra delay.

--HPS