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</div><div class="MsoNormal">Hello everyone.<span style="mso-spacerun:yes"> </span>I am
hoping someone may be able to offer some ideas or suggestions.<span style="mso-spacerun:yes"> </span>Basically, I am seeing some occasional packet
loss on the RX side of the NIC and wanted to address it.<span style="mso-spacerun:yes"> </span>Typically, I see the NIC not being able to
detect one packet out of 8,000,000 on average.<span style="mso-spacerun:yes">
</span>Maybe this is normal with PC HW/SW limitations???? </div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">The packets I send are the same packet over and over
(identical).<span style="mso-spacerun:yes"> </span>Let me do my best
explaining what I am seeing and the things I have tried so far.<span style="mso-spacerun:yes"> </span></div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I implemented the packet counters in a few ways.<span style="mso-spacerun:yes"> </span>I see the issue all 3 ways.</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span>1. Using the code from tutorial 6 with no filter</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
2. </span></span></span>Using the code from tutorial 6 with a filter</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span>3. Using pcap_stats function.<br></div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I like methods 1 and 2 above because I see what the data
rate is.<span style="mso-spacerun:yes"> </span>Also allows me to filter.</div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I am generating traffic in multiple ways. All three
experience the issue.</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span>1. Having the NIC generate traffic and using
SmartBits to receive it.<span style="mso-spacerun:yes"> </span>Also I am using
the above RX methods to detect packets being sent out.</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span>2. Routing cable from one NIC to another in the
same PC. So, one NIC sends data out and the other captures (counts) it.</div>
<div class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span style="mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span>3. Using Data Generator Equipment like SmartBits to
generate and the PC recieves</div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I have connected an Analyzer (SmartBits) to the NIC on
method 1 above and I can see the data generation from the PC is always
correct.<span style="mso-spacerun:yes"> </span>The number of packets being
sent out (what I am telling it to send) makes it to the SmartBits.<span style="mso-spacerun:yes"> </span>Except I see the occasional packet loss on the
NIC (outbound). So, I would think/expect the wpcap software should detect the
number of outgoing packets correctly all the time??<span style="mso-spacerun:yes"> </span></div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">On method 2, if I run the analyzer (stats) on both NIC’s,
they will mismatch as well.<span style="mso-spacerun:yes"> </span>For example,
the second NIC (receiver) counts the right number of packets being sent from
the first NIC.<span style="mso-spacerun:yes"> </span>But the first NIC misses
one.<span style="mso-spacerun:yes"> </span>And vice versa too.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">In the method 1 above, I tried both the buffer send method
and using the nwrite method.<span style="mso-spacerun:yes"> </span>Same
results.</div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I have tried to slow down the traffic.<span style="mso-spacerun:yes"> </span>Say 400Mb/s vs 960Mb/s on a 1G NIC.<span style="mso-spacerun:yes"> </span>Slowing it down helps slightly, but does not
fix it. </div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">If I change the timeout in the open command from 250 to
2000, not much changes.<span style="mso-spacerun:yes"> </span>If I change it
to 5000, it helps.<span style="mso-spacerun:yes"> </span>Of course, it is
slower to report.<span style="mso-spacerun:yes"> </span>This is true for
tutorial 6 code.<span style="mso-spacerun:yes"> </span>I am not sure about
pcap_stats.<span style="mso-spacerun:yes"> </span>I still need to try it.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I tried the snaplen in the open command from 100 to 65000. <span style="mso-spacerun:yes"> </span>I still see the issue.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I tried setting the buffer (pcap_setbuff) from 1,000,000 to
4,000,000 to 6,000,000.<span style="mso-spacerun:yes"> </span>Still see the
issue.</div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I have tried numerous NICs (5 different ones).</div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I have tried two different machines.<span style="mso-spacerun:yes"> </span>One is a Intel I7 3820 (Quad Core) and the
other is slower Intel Core 2 6700 (2.67MHZ) 2 GB RAM (Dual Core).<span style="mso-spacerun:yes"> </span>They both behave the same. </div>
<div class="MsoNormal" style="margin-left:.25in"> </div>
<div class="MsoNormal">I used a 10Gig NIC and similar results.<span style="mso-spacerun:yes"> </span>It is easier to see the loss because I can
send more packets quicker.<span style="mso-spacerun:yes"> </span>Versus on a
1G, it may take 2-3 minutes before I see it.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I tried modifying the PC buffers using a tool called “TCPOptimizer”.<span style="mso-spacerun:yes"> </span>Maybe it slightly helps.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I created numerous programs: One in C++, one in C#, one
using threads, etc. and the issue is still there.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I think that’s it so far with my ideas. <span style="font-family:Wingdings;mso-ascii-font-family:Calibri;mso-ascii-theme-font:
minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;
mso-char-type:symbol;mso-symbol-font-family:Wingdings"><span style="mso-char-type:
symbol;mso-symbol-font-family:Wingdings">J</span></span><span style="mso-spacerun:yes"> </span>Anyone have any suggestions?<span style="mso-spacerun:yes"> </span>I know it is only 1 packet every few minutes
but 1 packet loss is a big deal for testing too. </div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">Thanks!</div>
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