Here you go: (a diff shows no difference between them)

The call is:
usb_interrupt_read(devh, 0x00000083, buf, 0x000002a, 1000);

The code is originally from a reverse engineered linux driver which I
adapted to FreeBSD so there might be something I do wrong perhaps..


--
Johannes Lundberg
BRILLIANTSERVICE CO., LTD.


On Fri, Jan 3, 2014 at 10:13 PM, Hans Petter Selasky <h...@bitfrost.no>wrote:

> On 01/03/14 13:59, Lundberg, Johannes wrote:
> > Hi
> >
> > I had a bug driving me crazy and I finally discovered something weird
> that
> > was the reason.
> >
> > I have a pair of AR glasses from Vuzix which have a
> > gyro/accelerometer/compass which I read from USB using usb_interrupt_read
> > (reading 42 bytes of data).
> >
> > On my laptop I have two USB 2 and one USB 3 port.
> >
> >>From the USB 2 port things behave normally and reading takes a
> millisecond
> > or so.
> >
> >>From the USB 3 port things get weird and the call to usb_interrupt_read
> > takes over 20 milliseconds. I have been running this device on the same
> > laptop for some time and haven't noticed this behavior before.
> >
> > Can it be something that has been introduced recently or perhaps only my
> > system is behaving weird?...
> >
> > # uname -a
> > FreeBSD PC 10.0-BETA1 FreeBSD 10.0-BETA1 #0: Sun Dec  8 16:15:23 JST
> > 2013     root@PC:/usr/obj/usr/src/sys/GENERIC  i386
> >
> > Best regards
> > --
> > Johannes Lundberg
> >
>
> Hi,
>
> Can you show output from
> "usbconfig -d X.Y dump_device_desc dump_curr_config_desc"
>
> In both cases?
>
> --HPS
>

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WITH DEVICE IN USB 3 PORT

% usbconfig -d 1.2 dump_device_desc dump_curr_config_desc
ugen1.2: <Wrap USB Adapter Vuzix Corporation> at usbus1, cfg=0 md=HOST spd=FULL 
(12Mbps) pwr=ON (500mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0110 
  bDeviceClass = 0x0000 
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0008 
  idVendor = 0x1bae 
  idProduct = 0x014b 
  bcdDevice = 0x0102 
  iManufacturer = 0x0001  <Vuzix Corporation>
  iProduct = 0x0002  <Wrap USB Adapter>
  iSerialNumber = 0x0000  <no string>
  bNumConfigurations = 0x0001 


 Configuration index 0

    bLength = 0x0009 
    bDescriptorType = 0x0002 
    wTotalLength = 0x010f 
    bNumInterfaces = 0x0004 
    bConfigurationValue = 0x0001 
    iConfiguration = 0x0000  <no string>
    bmAttributes = 0x00a0 
    bMaxPower = 0x00fa 

    Interface 0
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0000 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0001 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x0a
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x0a, 0x24, 0x01, 0x00, 0x01, 0x75, 0x00, 0x02, 
       0x08 | 0x01, 0x02


      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x03, 0x01, 0x01, 0x00, 0x02, 
       0x08 | 0x03, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x01, 0x01, 0x02, 0x07, 0x01, 
       0x08 | 0x01, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x09, 0x24, 0x06, 0x02, 0x01, 0x01, 0x03, 0x00, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0d
      bDescriptorType = 0x24
      bDescriptorSubType = 0x04
       RAW dump: 
       0x00 | 0x0d, 0x24, 0x04, 0x04, 0x02, 0x03, 0x02, 0x02, 
       0x08 | 0x03, 0x00, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x0a
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x0a, 0x24, 0x06, 0x05, 0x04, 0x01, 0x01, 0x02, 
       0x08 | 0x02, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x03
       RAW dump: 
       0x00 | 0x09, 0x24, 0x03, 0x06, 0x01, 0x03, 0x00, 0x05, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x07, 0x01, 0x02, 0x01, 0x01, 
       0x08 | 0x01, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x09, 0x24, 0x06, 0x08, 0x07, 0x01, 0x03, 0x00, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x04
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x04, 0x0a, 0x01, 0x08, 0x01, 0x01, 
       0x08 | 0x00, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x03
       RAW dump: 
       0x00 | 0x09, 0x24, 0x03, 0x0b, 0x01, 0x01, 0x00, 0x0a, 
       0x08 | 0x00


    Interface 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0001 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>


    Interface 1 Alt 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0001 
      bAlternateSetting = 0x0001 
      bNumEndpoints = 0x0001 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x24, 0x01, 0x03, 0x01, 0x01, 0x00


      Additional Descriptor

      bLength = 0x0b
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0b, 0x24, 0x02, 0x01, 0x02, 0x02, 0x10, 0x01, 
       0x08 | 0x44, 0xac, 0x00


     Endpoint 0
        bLength = 0x0009 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0001  <OUT>
        bmAttributes = 0x0009  <ADAPT-ISOCHRONOUS>
        wMaxPacketSize = 0x00c0 
        bInterval = 0x0001 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x25
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



    Interface 2
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0002 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>


    Interface 2 Alt 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0002 
      bAlternateSetting = 0x0001 
      bNumEndpoints = 0x0001 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x24, 0x01, 0x0b, 0x01, 0x01, 0x00


      Additional Descriptor

      bLength = 0x0b
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01, 
       0x08 | 0x44, 0xac, 0x00


     Endpoint 0
        bLength = 0x0009 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0082  <IN>
        bmAttributes = 0x000d  <SYNC-ISOCHRONOUS>
        wMaxPacketSize = 0x00c0 
        bInterval = 0x0001 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x25
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



    Interface 3
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0003 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0002 
      bInterfaceClass = 0x0003 
      bInterfaceSubClass = 0x0000 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0003  <Vuzix Head Tracker>

      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x21
      bDescriptorSubType = 0x00
       RAW dump: 
       0x00 | 0x09, 0x21, 0x00, 0x01, 0x00, 0x01, 0x22, 0x29, 
       0x08 | 0x00

     Endpoint 0
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0083  <IN>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x002a 
        bInterval = 0x000a 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

     Endpoint 1
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0004  <OUT>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0040 
        bInterval = 0x000a 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

WITH DEVICE IN USB 2 PORT

% usbconfig -d 2.3 dump_device_desc dump_curr_config_desc
ugen2.3: <Wrap USB Adapter Vuzix Corporation> at usbus2, cfg=0 md=HOST spd=FULL 
(12Mbps) pwr=ON (500mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0110 
  bDeviceClass = 0x0000 
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0008 
  idVendor = 0x1bae 
  idProduct = 0x014b 
  bcdDevice = 0x0102 
  iManufacturer = 0x0001  <Vuzix Corporation>
  iProduct = 0x0002  <Wrap USB Adapter>
  iSerialNumber = 0x0000  <no string>
  bNumConfigurations = 0x0001 


 Configuration index 0

    bLength = 0x0009 
    bDescriptorType = 0x0002 
    wTotalLength = 0x010f 
    bNumInterfaces = 0x0004 
    bConfigurationValue = 0x0001 
    iConfiguration = 0x0000  <no string>
    bmAttributes = 0x00a0 
    bMaxPower = 0x00fa 

    Interface 0
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0000 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0001 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x0a
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x0a, 0x24, 0x01, 0x00, 0x01, 0x75, 0x00, 0x02, 
       0x08 | 0x01, 0x02


      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x03, 0x01, 0x01, 0x00, 0x02, 
       0x08 | 0x03, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x01, 0x01, 0x02, 0x07, 0x01, 
       0x08 | 0x01, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x09, 0x24, 0x06, 0x02, 0x01, 0x01, 0x03, 0x00, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0d
      bDescriptorType = 0x24
      bDescriptorSubType = 0x04
       RAW dump: 
       0x00 | 0x0d, 0x24, 0x04, 0x04, 0x02, 0x03, 0x02, 0x02, 
       0x08 | 0x03, 0x00, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x0a
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x0a, 0x24, 0x06, 0x05, 0x04, 0x01, 0x01, 0x02, 
       0x08 | 0x02, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x03
       RAW dump: 
       0x00 | 0x09, 0x24, 0x03, 0x06, 0x01, 0x03, 0x00, 0x05, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x02, 0x07, 0x01, 0x02, 0x01, 0x01, 
       0x08 | 0x01, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump: 
       0x00 | 0x09, 0x24, 0x06, 0x08, 0x07, 0x01, 0x03, 0x00, 
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x04
       RAW dump: 
       0x00 | 0x0c, 0x24, 0x04, 0x0a, 0x01, 0x08, 0x01, 0x01, 
       0x08 | 0x00, 0x00, 0x00, 0x00


      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x03
       RAW dump: 
       0x00 | 0x09, 0x24, 0x03, 0x0b, 0x01, 0x01, 0x00, 0x0a, 
       0x08 | 0x00


    Interface 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0001 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>


    Interface 1 Alt 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0001 
      bAlternateSetting = 0x0001 
      bNumEndpoints = 0x0001 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x24, 0x01, 0x03, 0x01, 0x01, 0x00


      Additional Descriptor

      bLength = 0x0b
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0b, 0x24, 0x02, 0x01, 0x02, 0x02, 0x10, 0x01, 
       0x08 | 0x44, 0xac, 0x00


     Endpoint 0
        bLength = 0x0009 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0001  <OUT>
        bmAttributes = 0x0009  <ADAPT-ISOCHRONOUS>
        wMaxPacketSize = 0x00c0 
        bInterval = 0x0001 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x25
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



    Interface 2
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0002 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0000 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>


    Interface 2 Alt 1
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0002 
      bAlternateSetting = 0x0001 
      bNumEndpoints = 0x0001 
      bInterfaceClass = 0x0001 
      bInterfaceSubClass = 0x0002 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x24, 0x01, 0x0b, 0x01, 0x01, 0x00


      Additional Descriptor

      bLength = 0x0b
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump: 
       0x00 | 0x0b, 0x24, 0x02, 0x01, 0x01, 0x02, 0x10, 0x01, 
       0x08 | 0x44, 0xac, 0x00


     Endpoint 0
        bLength = 0x0009 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0082  <IN>
        bmAttributes = 0x000d  <SYNC-ISOCHRONOUS>
        wMaxPacketSize = 0x00c0 
        bInterval = 0x0001 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

      Additional Descriptor

      bLength = 0x07
      bDescriptorType = 0x25
      bDescriptorSubType = 0x01
       RAW dump: 
       0x00 | 0x07, 0x25, 0x01, 0x01, 0x00, 0x00, 0x00



    Interface 3
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0003 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0002 
      bInterfaceClass = 0x0003 
      bInterfaceSubClass = 0x0000 
      bInterfaceProtocol = 0x0000 
      iInterface = 0x0003  <Vuzix Head Tracker>

      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x21
      bDescriptorSubType = 0x00
       RAW dump: 
       0x00 | 0x09, 0x21, 0x00, 0x01, 0x00, 0x01, 0x22, 0x29, 
       0x08 | 0x00

     Endpoint 0
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0083  <IN>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x002a 
        bInterval = 0x000a 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

     Endpoint 1
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0004  <OUT>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0040 
        bInterval = 0x000a 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

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