On 2014-06-17 16:10, Peter Meerwald wrote: > Hello David, > >>>> Third iteration. >>> >>> paplay --latency-msec XXX audio_s16_2ch_44k1.wav >>> on beagleboard-xm @ 1 GHz, kernel 3.15 > > I want to re-benchmark with SHM off, at first sight it appears that load > is LOWER (for low-latency)?! Iochannel + no SHM could very well be faster than iochannel + SHM, because SHM means some extra code. I would be surprised if iochannel + no SHM was significantly faster than srbchannel + SHM, because eventfds are supposed to be faster than pipes [1]. -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic [1] http://man7.org/linux/man-pages/man2/eventfd.2.html - "The kernel overhead of an eventfd file descriptor is much lower than that of a pipe".
