On 23/01/2011, at 24:03, Hans Petter Selasky wrote: > You need to change the way you buffer the data. FreeBSD does not queue more > than 2 URB's at any time, and the turnaround time varies from 1ms to 125us > due > to hardware IRQ restrictions. Linux queues up all it can get, which leads to > other kind of problems. The current internal buffer limit is 16Kbyte 8000 > times per second which gives a MAX of 128 MByte/second.
How difficult would it be to increase this? I obviously don't need any more throughput, however my application is very sensitive to latency, as I am reading out of a fairly small FIFO and if it fills up my entire run has to be aborted. -- 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 _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
