Hi ,
My USB 1.1 Full Speed (12mbps) device , which is
having one isoc endpoint of 840 bytes when tries to
read data through the isoc endpoint by making 20 URBs
, each URB having 840*10 (10 frames) bytes and it
takes more time to read data from device almost
600millisec .
How can i overcome this problem . Do i need any
configuration for bandwidth ?
I got kernel messages like the following . i am
using 2.6.4 kernel , with USB Controller INTEL UHCI .
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
869 + 66 = 935 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
935 + 66 = 1001 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1001 + 66 = 1067 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1067 + 66 = 1133 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1133 + 66 = 1199 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1199 + 66 = 1265 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1265 + 66 = 1331 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1331 + 66 = 1397 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1397 + 66 = 1463 usec
Sep 9 20:07:30 linux kernel: usb 1-1.4:
usb_check_bandwidth would have FAILED:
1463 + 66 = 1529 usec
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