[FE training-materials-updates] sysdev-realtime: add example of worst-case latencies results

[Thomas Petazzoni]

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:\\