On 03/02/2011, at 17:26, Daniel O'Connor wrote: > BTW do you have a feel for the latency in bulk vs iso? I currently have 5-10 > msec of buffering in the hardware which I plan on increasing but I'm not sure > what a reasonable amount would be :)
I increased this by a factor of 8 but I still get drop outs during disk activity. I timed libusb_handle_events_timeout() with a timeout of 1 millisecond and it quite often exceeds this (by a significant amount) eg.. Triggered at 1298039742 2011/02/18 14:35:27:ugsio_child: libusb took > 10msec - 32.44 ms 2011/02/18 14:35:27:ugsio_child: libusb took > 10msec - 27.19 ms 2011/02/18 14:35:27:ugsio_child: libusb took > 10msec - 25.27 ms 2011/02/18 14:35:27:ugsio_child: libusb took > 10msec - 21.83 ms 2011/02/18 14:35:36:ugsio_child: libusb took > 10msec - 48.23 ms Error during acquisition - ERROR:305 UGSIO aborted transfer: stalled (still using bulk transfers for now) -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[email protected]"
