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| author | guest <guest@cba7306a-a4a0-4afd-bcb4-bd19f8a24309> | 2007-11-30 13:41:25 +0000 |
|---|---|---|
| committer | guest <guest@cba7306a-a4a0-4afd-bcb4-bd19f8a24309> | 2007-11-30 13:41:25 +0000 |
| commit | eacbf5bb4d57af21c731f41251015d3b991ad490 (patch) | |
| tree | 477f43a79c75b400228a7c492f670a1c4886b5c3 /diplomathesis/node54.html | |
final version, initial import
git-svn-id: svn+ssh://mecka.net/home/svn/rtcorba-thesis@1 cba7306a-a4a0-4afd-bcb4-bd19f8a24309
Diffstat (limited to 'diplomathesis/node54.html')
| -rw-r--r-- | diplomathesis/node54.html | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/diplomathesis/node54.html b/diplomathesis/node54.html new file mode 100644 index 0000000..8f45194 --- /dev/null +++ b/diplomathesis/node54.html @@ -0,0 +1,220 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> + +<!--Converted with LaTeX2HTML 2002-2-1 (1.71) +original version by: Nikos Drakos, CBLU, University of Leeds +* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan +* with significant contributions from: + Jens Lippmann, Marek Rouchal, Martin Wilck and others --> +<HTML> +<HEAD> +<TITLE>Lösung</TITLE> +<META NAME="description" CONTENT="Lösung"> +<META NAME="keywords" CONTENT="diplomathesis"> +<META NAME="resource-type" CONTENT="document"> +<META NAME="distribution" CONTENT="global"> + +<META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1"> +<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> + +<LINK REL="STYLESHEET" HREF="diplomathesis.css"> + +<LINK REL="next" HREF="node55.html"> +<LINK REL="previous" HREF="node53.html"> +<LINK REL="up" HREF="node51.html"> +<LINK REL="next" HREF="node55.html"> +</HEAD> + +<BODY > + +<DIV CLASS="navigation"><!--Navigation Panel--> +<A NAME="tex2html930" + HREF="node55.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" + SRC="/usr/share/latex2html/icons/next.png"></A> +<A NAME="tex2html926" + HREF="node51.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" + SRC="/usr/share/latex2html/icons/up.png"></A> +<A NAME="tex2html920" + HREF="node53.html"> +<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" + SRC="/usr/share/latex2html/icons/prev.png"></A> +<A NAME="tex2html928" + HREF="node3.html"> +<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" + SRC="/usr/share/latex2html/icons/contents.png"></A> +<BR> +<B> Next:</B> <A NAME="tex2html931" + HREF="node55.html">Anmerkungen zu den weiteren</A> +<B> Up:</B> <A NAME="tex2html927" + HREF="node51.html">Ergebnisse</A> +<B> Previous:</B> <A NAME="tex2html921" + HREF="node53.html">Lösungsansätze</A> + <B> <A NAME="tex2html929" + HREF="node3.html">Contents</A></B> +<BR> +<BR></DIV> +<!--End of Navigation Panel--> + +<H5><A NAME="SECTION00063343000000000000"></A> +<A NAME="cap:reprio"></A> +<BR> +Lösung +</H5> + +<P> +Durch die Neuzuordnung der IRQ-Prioritäten wurden die Latenzschwankungen nahezu eliminiert: + +<P> +<A NAME="995"></A> +<TABLE CELLPADDING=3 BORDER="1"> +<CAPTION><STRONG>Table 6:</STRONG> +Repriorisierung CPX1 - Supplier - RTCORBA Client</CAPTION> +<TR><TH ALIGN="LEFT"><SPAN CLASS="textbf">Prozess</SPAN></TH> +<TH ALIGN="LEFT"><SPAN CLASS="textbf">Priorität</SPAN></TH> +<TH ALIGN="LEFT"><SPAN CLASS="textbf">Kommentar</SPAN></TH> +</TR> +<TR><TD ALIGN="LEFT">Supplier</TD> +<TD ALIGN="LEFT">RT (-99)</TD> +<TD ALIGN="LEFT">RTCORBA Client</TD> +</TR> +<TR><TD ALIGN="LEFT">softirq-net-rx</TD> +<TD ALIGN="LEFT">-35</TD> +<TD ALIGN="LEFT"> </TD> +</TR> +<TR><TD ALIGN="LEFT">softirq-net-tx</TD> +<TD ALIGN="LEFT">-40</TD> +<TD ALIGN="LEFT"> </TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 6</TD> +<TD ALIGN="LEFT">-50</TD> +<TD ALIGN="LEFT">Digitale Ein/Ausgänge</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 14</TD> +<TD ALIGN="LEFT">-2</TD> +<TD ALIGN="LEFT">ide0</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 17</TD> +<TD ALIGN="LEFT">-80</TD> +<TD ALIGN="LEFT">eth0 (für RT Kommunikation)</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 18</TD> +<TD ALIGN="LEFT">-2</TD> +<TD ALIGN="LEFT">ethX (restliche Ethernetports)</TD> +</TR> +<TR><TD ALIGN="LEFT"><A NAME="tab:rePrioSup"></A></TD> +<TD ALIGN="LEFT"> </TD> +<TD ALIGN="LEFT"> </TD> +</TR> +</TABLE> + +<A NAME="1003"></A> +<TABLE CELLPADDING=3 BORDER="1"> +<CAPTION><STRONG>Table 7:</STRONG> +Repriorisierung CPX2 - Receiver - RTCORBA Server</CAPTION> +<TR><TH ALIGN="LEFT"><SPAN CLASS="textbf">Prozess</SPAN></TH> +<TH ALIGN="LEFT"><SPAN CLASS="textbf">Priorität</SPAN></TH> +<TH ALIGN="LEFT"><SPAN CLASS="textbf">Kommentar</SPAN></TH> +</TR> +<TR><TD ALIGN="LEFT">Receiver</TD> +<TD ALIGN="LEFT">RT (-99)</TD> +<TD ALIGN="LEFT">RTCORBA Server</TD> +</TR> +<TR><TD ALIGN="LEFT">softirq-net-rx</TD> +<TD ALIGN="LEFT">-45</TD> +<TD ALIGN="LEFT"> </TD> +</TR> +<TR><TD ALIGN="LEFT">softirq-net-tx</TD> +<TD ALIGN="LEFT">-20</TD> +<TD ALIGN="LEFT">Senden ist rel. unwichtig</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 6</TD> +<TD ALIGN="LEFT">-50</TD> +<TD ALIGN="LEFT">Digitale Ein/Ausgänge</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 14</TD> +<TD ALIGN="LEFT">-2</TD> +<TD ALIGN="LEFT">ide0</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 17</TD> +<TD ALIGN="LEFT">-80</TD> +<TD ALIGN="LEFT">eth0 (für RT Kommunikation)</TD> +</TR> +<TR><TD ALIGN="LEFT">IRQ 18</TD> +<TD ALIGN="LEFT">-2</TD> +<TD ALIGN="LEFT">ethX (restliche Ethernetports)</TD> +</TR> +<TR><TD ALIGN="LEFT"><A NAME="tab:rePrioRec"></A></TD> +<TD ALIGN="LEFT"> </TD> +<TD ALIGN="LEFT"> </TD> +</TR> +</TABLE> + +<P> +Beim Supplier wird die Priorität des softirq-net-rx Prozesses erhöht, somit wird sichergestellt, dass die TCP-acknowledge Pakete vom Receiver rechtzeitig empfangen werden können. Dies hat zur Folge, dass die Datenübertragung nicht wegen eines fehlenden acknowledge Pakets eingefroren wird. + +<P> +Der Receiver bekommt durch die Erhöhung der Priorität von softirq-net-tx die Chance zeitgerecht die TCP-acknowledge Pakete zu versenden. + +<P> + +<DIV ALIGN="CENTER"> + +<P><A NAME="img:optVerteilungOhneLast1"></A><A NAME="img:optVerteilung1"></A></P> <DIV ALIGN="CENTER"> +</DIV><TABLE WIDTH="349"><CAPTION ALIGN="BOTTOM"><STRONG>Figure 19:</STRONG> +Supplier u. Receiver o. Last</CAPTION> +<TR><TD> + [width=]./img/v1/v1optOhneLast.jpg + </TD></TR> +</TABLE> +<DIV ALIGN="CENTER"> + </DIV><TABLE WIDTH="349"><CAPTION ALIGN="BOTTOM"><STRONG>Figure 20:</STRONG> +Supplier u. Receiver m. xdd, flood ping u. cpuburnP5 belastet</CAPTION> +<TR><TD> + [width=]./img/v1/v1opt.jpg + </TD></TR> +</TABLE> +<DIV ALIGN="CENTER"> +</DIV> + <HR> +</DIV> + +<P> +Abbildung <A HREF="#img:optVerteilungOhneLast1">19</A> und <A HREF="#img:optVerteilung1">20</A> zeigen, dass die Latenzzeiten nicht mehr gravierend mit der Systemauslastung korreliert sind. Durch die Repriorisierung der Interruptprozesse wurde die Echtzeitperformance gravierend verbessert. Alle weiteren Versuche werden mit dieser Priorisierung durchgeführt. + +<P> + +<DIV CLASS="navigation"><HR> +<!--Navigation Panel--> +<A NAME="tex2html930" + HREF="node55.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" + SRC="/usr/share/latex2html/icons/next.png"></A> +<A NAME="tex2html926" + HREF="node51.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" + SRC="/usr/share/latex2html/icons/up.png"></A> +<A NAME="tex2html920" + HREF="node53.html"> +<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" + SRC="/usr/share/latex2html/icons/prev.png"></A> +<A NAME="tex2html928" + HREF="node3.html"> +<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" + SRC="/usr/share/latex2html/icons/contents.png"></A> +<BR> +<B> Next:</B> <A NAME="tex2html931" + HREF="node55.html">Anmerkungen zu den weiteren</A> +<B> Up:</B> <A NAME="tex2html927" + HREF="node51.html">Ergebnisse</A> +<B> Previous:</B> <A NAME="tex2html921" + HREF="node53.html">Lösungsansätze</A> + <B> <A NAME="tex2html929" + HREF="node3.html">Contents</A></B> </DIV> +<!--End of Navigation Panel--> +<ADDRESS> +Manuel Traut +2007-02-25 +</ADDRESS> +</BODY> +</HTML> |