linuxaudio.org

On Thursday 21 July 2011, at 00.36.55, Philipp Überbacher

 wrote:

[...]

quoted text
> > ..and this latency plot is stunning:

> > https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencypl...

> > t-r4s6.0.html?latencies=&showno=&slider=57

[...]

quoted text
> The plot really does look stunning, strangly (?) not on other machines.

> https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencypl...

> r4s7.0.html

> https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencypl...

> -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   |

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