<html><body bgcolor="#FFFFFF"><div><br>In addition to the previous mail : the number of Packets that I received in my app is equal to the number of ps_recv. Therefore I think the packets drops happens before the winpcap driver. Is it right ?<br>
<br><div><br></div><div>Liuyulou</div></div><div><br>在 2010-12-1，15:12，Helmut Vaupotitsch <<a href="mailto:hv@itec-audio.com">hv@itec-audio.com</a>> 写道：<br><br></div><div></div><blockquote type="cite"><div>
<tt>if ps_drop=0, then the *driver* hasn´t lost packets (see Re:
[Winpcap-users] Question about the struct type pcap_t. from 28.10!)<br>
Most likely your app looses packets... <br>
...try to implement a ringbuffer in the following way: one thread just
fills the pre-allocated FIFO, another thread processes the buffer<br>
<br>
Regards<br>
Helmut<br>
</tt><br>
yulou liu schrieb:
<blockquote cite="mid:-3903147086001883442@unknownmsgid" type="cite">
<div><br>
<br>
<span class="Apple-style-span" style="font-size: medium; "><br></span><span class="Apple-style-span" style="font-size: medium; ">
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">I have made these experiments :</font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">PC captures data packets from a
FPGA board. </font></span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2"> </font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">1, I made a Loop back test that
can verify there is no packet drops between FPGA TO FPGA.</font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font face="宋体" size="2"> </font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">2Each data packets from FPGA
board has a sequence number. Then PC can figure that there are
packets drops. (the packets number that pc gets does not match the
sequence of the packets).</font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2"> </font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">3, call the pcap_stats_ex() ,
the result is : ps_drop=0 . That means there is no packets drops
between the kernel buffer to user buffer. </font></span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2"> </font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2"> </font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">According to above , Packet
drops could occur in the system netcard to winPcap kernel
driver. Is this conclusion right ?</font></span><span class="Apple-style-span" style="font-size: medium;"> </span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;"><font color="blue" face="Calibri" size="2">Is it is right , what is the
suggestion ? Can it be improved to use a more professional net card
? </font></span><span class="Apple-style-span" style="font-size: medium;"><font face="sans-serif" size="2"><br>
</font></span><span class="Apple-style-span" style="font-size: medium;"><br>
</span><span class="Apple-style-span" style="font-size: medium;">
<pre> </pre>
</span>
<div><br>
</div>
<div>Liuyulou</div>
</div>
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