On Mon, Oct 28, 2002, anton wilson <[EMAIL PROTECTED]> wrote: > On Friday 25 October 2002 06:36 pm, Johannes Erdfelt wrote: > > On Fri, Oct 25, 2002, anton wilson <[EMAIL PROTECTED]> wrote: > > > In a USB driver, I'm chaining ISO urbs by resubmitting the URBS in the > > > completion handler. I also time the calls to the urb completion handlers > > > using do_gettimeofday(). Most of the time, the time between interrupts is > > > at most 1.01 ms, but occasionally there may be a 2 ms time inbetween > > > interrupts. By occasional I mean 1 or 2 times every 10 seconds. Is this > > > normal behaviour? And what kinds of things could cause an additional 1 ms > > > delay between calls to the completion handler? > > > > What HC are you using? What kernel? > > linux 2.4.18 with 0(1) - preemptive and low-latency - > UHCI
How many Isochronous buffers are you scheduling at one time? Which UHCI driver? JE ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
