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<H5><A NAME="SECTION00063343000000000000"></A>
<A NAME="cap:reprio"></A>
<BR>
L&#246;sung
</H5>

<P>
Durch die Neuzuordnung der IRQ-Priorit&#228;ten 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">Priorit&#228;t</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">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT">softirq-net-tx</TD>
<TD ALIGN="LEFT">-40</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT">IRQ 6</TD>
<TD ALIGN="LEFT">-50</TD>
<TD ALIGN="LEFT">Digitale Ein/Ausg&#228;nge</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 (f&#252;r 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">&nbsp;</TD>
<TD ALIGN="LEFT">&nbsp;</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">Priorit&#228;t</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">&nbsp;</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/Ausg&#228;nge</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 (f&#252;r 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">&nbsp;</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
</TR>
</TABLE>

<P>
Beim Supplier wird die Priorit&#228;t des softirq-net-rx Prozesses erh&#246;ht, somit wird sichergestellt, dass die TCP-acknowledge Pakete vom Receiver rechtzeitig empfangen werden k&#246;nnen. Dies hat zur Folge, dass die Daten&#252;bertragung nicht wegen eines fehlenden acknowledge Pakets eingefroren wird.

<P>
Der Receiver bekommt durch die Erh&#246;hung der Priorit&#228;t 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 durchgef&#252;hrt.

<P>

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<ADDRESS>
Manuel Traut
2007-02-25
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