usb_interrupt_read speed different on USB 2 vs 3 port.
Lundberg, Johannes
johannes at brilliantservice.co.jp
Fri Jan 3 13:26:28 UTC 2014
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 <hps at 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 at 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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-------------- next part --------------
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
-------------- next part --------------
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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