On Thursday 21 July 2011, at 00.36.55, Philipp Überbacher <hollun...@lavabit.com> wrote: [...] > > ..and this latency plot is stunning: > > https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencyplo > > t-r4s6.0.html?latencies=&showno=&slider=57 [...] > The plot really does look stunning, strangly (?) not on other machines. > https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencyplot- > r4s7.0.html > https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencyplot > -r4s8.0.html > > No idea what those plots tell about real world usage. It's good to get > another set of patches though.
In terms of worst case figures, these plots look a bit like what I've seen with RT-Linux and RTAI on various hardware (PII/III workstations via Geode SBCs through Intel Core based Celerons on industrial Mini-ITX boards), though with "true" RT kernels, one tends to get a lot of very low latency points, and only the occasional peak. SBCs with lowpower CPUs (Geode and the like) tend to perform a lot worse than "proper" laptop and desktop CPUs. Memory and/or cache bandwidth issues, maybe? -- //David Olofson - Consultant, Developer, Artist, Open Source Advocate .--- Games, examples, libraries, scripting, sound, music, graphics ---. | http://consulting.olofson.net http://olofsonarcade.com | '---------------------------------------------------------------------' _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev