Trent Piepho <xyzzy@xxxxxxxxxxxxx> writes: > I take it you do the format conversion and copying into the mmapped buffer on > the sync call? Have you considered doing the format conversion earlier? Have > just one bounce buffer for the hardware, and convert the data as soon as the > hardware buffer is full and an empty mmap buffer is available? Not that trivial, because doing such processing in the IRQ handler is a bad idea (would increase IRQ latencies alot). Doing that in a kernel thread or something simliar (tasklets?) would be possible and might help to reduce latencies because SYNC may return instantly without any processing required. Gerd -- sigfault
