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<DIV><FONT size=2>Moving the processing code in a separate thread may or might
not help. If you move the processing on a different thread and use a FIFO/linked
list to pass the packets among the threads, you will need to copy the packets in
your own allocated buffer. Copying a packet is extremely fast, but it makes
sense only if your packet processing code is much more CPU intensive than
copying the packet itself. Also, using a different thread makes sense if you run
on a multicore machine, where basically you can use both the CPUs.</FONT></DIV>
<DIV><FONT size=2>If you go this way, remember to preallocate and reuse the
buffers in which you copy the packets, do not allocate a new buffer
whenever you receive a packet.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Hope this helps</FONT></DIV>
<DIV><FONT size=2>GV<BR></FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=dennis.kg@gmail.com href="mailto:dennis.kg@gmail.com">Denis
Kourktchan</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, August 09, 2009 1:05
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Winpcap-users] How to ensure
all packets are captured</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal>Hi Everybody,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I am writing an application that is intercepting packets
from a network and after reading a whole lot of posts regarding lost messages
I figured the fault is usually in application taking too long to process a
batch of packets which causes the overfilled buffer to replace oldest
messages. So I decided that the following setup is the best possible way to
ensure that my messages are not lost.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Put capture (using pcap_next_ex()) into a different
thread then the processing.<o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Store packets immediately upon extraction into a
custom written linked list, adding to the end and processing from the front
(in different threads) ensuring no mutex controls are necessary and no idle
time.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Now here is the problem for which I need your expert
advice, since the pcap_next_ex() returns pointers to data, I still need to
extract them (I use for loop) before I can store which still preoccupies the
capture thread and slows down extraction process. So is there a better way to
extract packets without this delay?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I would appreciate any and all advice regarding the optimal
solution architecture wise.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Regards,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l1 level1 lfo2"><![if !supportLists]><SPAN
style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Dennis <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Winpcap-users
mailing
list<BR>Winpcap-users@winpcap.org<BR>https://www.winpcap.org/mailman/listinfo/winpcap-users<BR></BLOCKQUOTE></BODY></HTML>