TitleAudio and Gesture Latency Measurements on Linux and OSX
Publication TypeConference Paper
Year of Publication2004
AuthorsWright, M, Cassidy, RJ, Zbyszynski, MF
Conference NameInternational Computer Music Conference
PublisherInternational Computer Music Association
Conference LocationMiami, FL

We have measured the total system latencies of MacOS 10.2.8, Red Hat Linux (2.4.25 kernel with low-latency patches), and Windows XP from stimulus in to audio out, with stimuli including analog and digital audio, and the QWERTY keyboard. We tested with a variety of audio hardware interfaces, audio drivers, buffering and related configuration settings, and scheduling modes. All measured audio latencies tracked expectedly with buffer sizes but with a consistent amount of unexplained additional latency. With analog I/O there was also a consistent additional bandwidth-dependent latency seemingly caused by hardware. Gesture tests with the QWERTY keyboard indicate discouragingly large amounts of latency and jitter, but large improvements on Linux when real-time priorities are set.