[FE training-materials-updates] Boot time slides: add 'quiet' measurements

Michael Opdenacker michael.opdenacker at free-electrons.com
Mon Apr 21 18:34:41 CEST 2014


Repository : git://git.free-electrons.com/training-materials.git

On branch  : master
Link       : http://git.free-electrons.com/training-materials/commit/?id=a7982fc7f735eaa28df2f781290c4209e76c5737

>---------------------------------------------------------------

commit a7982fc7f735eaa28df2f781290c4209e76c5737
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date:   Mon Apr 21 14:46:07 2014 +0200

    Boot time slides: add 'quiet' measurements
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>


>---------------------------------------------------------------

a7982fc7f735eaa28df2f781290c4209e76c5737
 slides/boottime-kernel/boottime-kernel.tex |   29 +++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/slides/boottime-kernel/boottime-kernel.tex b/slides/boottime-kernel/boottime-kernel.tex
index 84dccbc..dd13798 100644
--- a/slides/boottime-kernel/boottime-kernel.tex
+++ b/slides/boottime-kernel/boottime-kernel.tex
@@ -143,13 +143,26 @@ Conclusion: don't use LZO for now.
 \end{frame}
 
 \begin{frame}
-\frametitle{Tuning the command line}
+\frametitle{Turning off console output}
 \begin{itemize}
-	\item The console output is actually taking a lot of time. You
-		probably don't need it in production. It can be disabled by
-		passing the \code{quiet} argument on the kernel command line.
-		You will still be able to use \code{dmesg} to get the
-		messages.
+\item Console output is actually taking a lot of time. You
+      probably don't need it in production. It can be disabled by
+      passing the \code{quiet} argument on the kernel command line.
+\item You will still be able to use \code{dmesg} to get the kernel
+      messages.
+\item Time to start the \code{init} program, on Atmel
+      SAMA5D3 Xplained (ARM), Linux 3.10:
+      \newline\newline
+    \begin{tabular}{| l || c | c | c |}
+    \hline
+    & Time & Diff \\
+    \hline
+    Without \code{quiet} & 20.380 s & \\
+    With \code{quiet} & 19.308 s & -1.072 s\\
+    \hline
+    \end{tabular}
+      \newline
+\item Less time will be saved on a reduced kernel, of course.
 \end{itemize}
 \end{frame}
 
@@ -174,7 +187,8 @@ Calibrating delay loop... 262.96 BogoMIPS (lpj=1314816)
 Calibrating delay loop (skipped) preset value.. 262.96 BogoMIPS (lpj=1314816)
 \end{verbatim}
 \end{block}
-	\item Tests on the Atmel SAMA5D3 Xplained (ARM), Linux 3.10:
+	\item Tests on Atmel SAMA5D3 Xplained (ARM), Linux 3.10:
+      \newline\newline
     \begin{tabular}{| l || c | c | c |}
     \hline
     & Time & Diff \\
@@ -183,6 +197,7 @@ Calibrating delay loop (skipped) preset value.. 262.96 BogoMIPS (lpj=1314816)
     With \code{lpj} & 8 ms & -63 ms\\
     \hline
     \end{tabular}
+	\newline
 	\item This calculation was longer before 2.6.39 (about 200 ms).
 \end{itemize}
 \end{frame}



More information about the training-materials-updates mailing list