What is wrong with FreeBSD and USB Support
Hans Petter Selasky
hps at selasky.org
Mon Mar 6 11:31:26 UTC 2017
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.
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