<div>Hi!</div>
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<div>I have a question, pcap_next_ex() can only get one ethernet packet at a call. Is there other way that I can read more than one packet from the user buffer (or kernel buffer) at one call ? I think maybe that would decrease the packet loss.</div>
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<div>Thank you.</div>
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<div class="gmail_quote">2010/8/7 yulou liu <span dir="ltr"><<a href="mailto:lyulou@gmail.com">lyulou@gmail.com</a>></span><br>
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<div>1. Maybe I didn't make it clear .I don't just want to count , I want to save the data to disk(ramdisk ) too . At the rate of 614Mbps, recording data lasts about 2 minutes. But I found it began to have packets loss sometimes ,even I just count the packets number.</div>
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<div>2. All the packets from the fpga is 1514, I made the minitocopy as 8 kytes, kernel buffer and user buffer both as 32MB.</div>
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<div>3. There is still have tcp/ip bound to the netcard , it is recommended to disable it? I will have a try.</div>
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<div>Thank you. <span> </span></div>
<div> <br><br>在 2010-8-7，1:45，Gianluca Varenni <<a href="mailto:gianluca.varenni@cacetech.com" target="_blank">gianluca.varenni@cacetech.com</a>> 写到：<br><br></div>
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<div><font face="Calibri">I'm not 100% sure what the performance problem has to do with the live_dump feature. At those traffic rates you definitely don't want to dump all the packets to disk. If you are just interested in counting the packets, I would use the statistical mode of WinPcap to just count the packets. Follow the sample Examples-remote\tcptop for that.</font></div>
<div><font face="Calibri"></font> </div>
<div><font face="Calibri">Having said, at those rates there is no guarantee that WinPcap will be able to keep up (especially if the packets are small). What is the average packet size that you are analyzing? Did you disable all the bound protocols from the network card used for the capture?</font></div>
<div><font face="Calibri"></font> </div>
<div><font face="Calibri">Have a nice day</font></div>
<div><font face="Calibri">GV</font></div>
<div><font face="Calibri"></font> </div>
<div><font face="Calibri"></font> </div>
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<div><b>From:</b> <a title="lyulou@gmail.com" href="mailto:lyulou@gmail.com" target="_blank">yulou liu</a> </div>
<div><b>Sent:</b> Friday, August 06, 2010 10:14 AM</div>
<div><b>To:</b> <a title="winpcap-users@winpcap.org" href="mailto:winpcap-users@winpcap.org" target="_blank"><a href="mailto:winpcap-users@winpcap.org" target="_blank">winpcap-users@winpcap.org</a></a> </div>
<div><b>Subject:</b> Re: [Winpcap-users] does the winpcap version 4.1.2 supportthekernelDump feature?</div></div></div>
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<blockquote type="cite"><span style="COLOR: rgb(0,0,0)">
<div>yes，i don't want to use an old version either.but there has been a problem that I can't resolve . I made a capture program to collecte datas which are sent from an fpga . There are several receive threads in the program, each of threads accesses a global netcard port in tern. In order to verify the performace ,it just do the least thing In the receive thread---it just count the amount of Ethernet frames that it receive. But when the fpga sending rate increases,especially above 500Mbps, it sometimes loss packets. My question is, is it possible to totally avoid packets loss by optimism the code? I want to collect datas on the speed 614Mbps without packet loss. My workstations features with 2 Xeon CPU (each has 4core), 1 G onboard netcard. <br>
</div></span></blockquote>Thanks a lot!<br>
<blockquote type="cite"><span style="COLOR: rgb(0,0,0)">
<div><br>在 2010-8-6，23:58，Gianluca Varenni <<a href="mailto:gianluca.varenni@cacetech.com" target="_blank"><a href="mailto:gianluca.varenni@cacetech.com" target="_blank">gianluca.varenni@cacetech.com</a></a>> 写到：<br>
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<div><font face="Calibri">I would definitely avoid using an old version of WinPcap (like 3.0alpha2). A huge number of bugs have been fixed since that release, including critical bugs in the driver that could cause OS crashes.</font></div>
<div><font face="Calibri"></font> </div>
<div><font face="Calibri">Have a nice day</font></div>
<div><font face="Calibri">GV</font></div>
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<div><b>From:</b> <a title="lyulou@gmail.com" href="mailto:lyulou@gmail.com" target="_blank">yulou liu</a></div>
<div><b>Sent:</b> Thursday, August 05, 2010 7:22 PM</div>
<div><b>To:</b> <a title="winpcap-users@winpcap.org" href="mailto:winpcap-users@winpcap.org" target="_blank"></a><a title="mailto:winpcap-users@winpcap.org
CTRL + Click to follow link" href="mailto:winpcap-users@winpcap.org" target="_blank"><a href="mailto:winpcap-users@winpcap.org" target="_blank">winpcap-users@winpcap.org</a></a></div>
<div><b>Subject:</b> Re: [Winpcap-users] does the winpcap version 4.1.2 support thekernelDump feature?</div></div></div>
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<div><span style="FONT-SIZE: 15px"><br><font size="2" face="宋体"> </font> <br><font size="2" face="宋体">thanks a lot. </font><br><font size="2" face="宋体"> </font> <br><font size="2" face="宋体">I have another question. </font><br>
<font size="2" face="宋体">Is there any possible that I could use the live_dump feature if I install the older version of winpcap ?</font> <br><font size="2" face="宋体"> </font> <br><font size="2" face="宋体">the following was what I just tried this morning:</font> <br>
<font size="2" face="宋体"> </font> <br><font size="2" face="宋体">1. install the 3.0alpha2-WinPcap.exe </font><br><font size="2" face="Calibri">2. download the "</font><font size="2" face="宋体">3.0beta-wpdpack.zip</font><font size="2" face="Calibri">" file and unzip , and config VC6 to refer to the lib , include's directions .</font> <br>
<font size="2" face="Calibri"> </font> <br><font size="2" face="Calibri">Compile the project which uses pcap_live_dump(). It was successully compiled . </font><br><font size="2" face="Calibri">But when I run the .exe file , it can't find the netcard interfaces. </font><br>
<font size="2" face="Calibri"> </font> <br><font size="2" face="Calibri">Please tell me what mistakes did I make ? </font><br><font size="2" face="宋体"> </font> <br><font size="2" face="Calibri">Thank you. </font><br><font size="2" face="sans-serif"><br>
<br></font></span>在 2010-8-6，0:45，Gianluca Varenni <<a href="mailto:gianluca.varenni@cacetech.com" target="_blank"></a><a href="mailto:gianluca.varenni@cacetech.com" target="_blank"><a href="mailto:gianluca.varenni@cacetech.com" target="_blank">gianluca.varenni@cacetech.com</a></a>> 写到：<br>
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<div><font face="Calibri">The live_dump feature has been disabled several years ago (because of other changes in the driver) and no one has worked to support it again. At the moment in order to dump to disk you need to use the standard dump-to-disk mechanism shown in sample "savedump" in the WinPcap developer's pack.</font></div>
<div><font face="Calibri"></font> </div>
<div><font face="Calibri">Have a nice day.</font></div>
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<div style="BACKGROUND-COLOR: rgb(245,245,245)">
<div><b>From:</b> <a title="lyulou@gmail.com" href="mailto:lyulou@gmail.com" target="_blank">yulou liu</a></div>
<div><b>Sent:</b> Thursday, August 05, 2010 9:32 AM</div>
<div><b>To:</b> <a title="winpcap-users@winpcap.org" href="mailto:winpcap-users@winpcap.org" target="_blank"></a><a href="mailto:winpcap-users@winpcap.org" target="_blank"></a><a href="mailto:winpcap-users@winpcap.org" target="_blank"><a href="mailto:winpcap-users@winpcap.org" target="_blank">winpcap-users@winpcap.org</a></a></div>
<div><b>Subject:</b> [Winpcap-users] does the winpcap version 4.1.2 support the kernelDump feature?</div></div></div>
<div><br></div>
<div>I'm working on a project , that I want to dump packets to the disk .</div>
<div>I think the pcap_live_dump() maybe could work in the way I want.</div>
<div>but it seems the pcap_live_dump() is not supported in the new version of winpcap.</div>
<div>is it true ??</div>
<div> </div>
<div>thank you.</div>
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