[FE training-materials-updates] sysdev-realtime: add example of worst-case latencies results
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Mon Oct 8 12:42:19 CEST 2012
Repository : git://git.free-electrons.com/training-materials.git
On branch : master
Link : http://git.free-electrons.com/training-materials/commit/?id=96ec8414749ec09ed29194b017479a1c794d2ac0
>---------------------------------------------------------------
commit 96ec8414749ec09ed29194b017479a1c794d2ac0
Author: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Date: Mon Oct 8 12:42:12 2012 +0200
sysdev-realtime: add example of worst-case latencies results
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
>---------------------------------------------------------------
96ec8414749ec09ed29194b017479a1c794d2ac0
slides/sysdev-realtime/sysdev-realtime.tex | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/slides/sysdev-realtime/sysdev-realtime.tex b/slides/sysdev-realtime/sysdev-realtime.tex
index 2d09654..a043506 100644
--- a/slides/sysdev-realtime/sysdev-realtime.tex
+++ b/slides/sysdev-realtime/sysdev-realtime.tex
@@ -903,6 +903,19 @@ echo 0 > /debug/tracing/tracing_enabled
\end{frame}
\begin{frame}
+ \frametitle{Exemple of worst-case latencies}
+ Tests done with \code{cyclictest}
+ \begin{itemize}
+ \item x86 Geode 500 Mhz: 96 us
+ \item x86 Pentium Dual-core T4500 2.3 Ghz: 36 us
+ \item ARM Freescale i.MX35 533 Mhz: 120 us
+ \item ARM Marvell 88FR131 1200 Mhz: 54 us
+ \end{itemize}
+ See more results at
+ \url{https://www.osadl.org/QA-Farm-Realtime.qa-farm-about.0.html}
+\end{frame}
+
+\begin{frame}
\frametitle{Useful reading}
About real-time support in the standard Linux kernel
\begin{itemize}
@@ -1352,6 +1365,17 @@ ARCH-gcc $CFL -o rttest rttest.c $LDF
\end{frame}
\begin{frame}
+ \frametitle{Xenomai worst-case latencies results}
+ \begin{itemize}
+ \item x86 Atom 1.6 Ghz: 23 us
+ \item ARM AT91SAM9263 180 Mhz: 91 us
+ \item ARM OMAP3530 720 Mhz: 40 us
+ \item ARM OMAP4430 1 Ghz (SMP): 31 us
+ \end{itemize}
+ See results at \url{http://xenomai.org/~gch/core-3.4-latencies/}
+\end{frame}
+
+\begin{frame}
\frametitle{Real-time approaches} The following table is Paul Mac
Kenney's summary of his own article describing the various
approaches for real-time on Linux:\\
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