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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Anton,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’ve got an WinPcap application which I don’t believe looses packets, but this may actually be happening and is naturally fixed by higher level protocol retransmissions (i.e. TCP). In any case, in our usage of WinPcap we do the following:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>pcap_open_live() is called with promiscuous set, and a timeout of -1.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We don’t use pcap_setbuf() but you certainly could.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>pcap_setmintocopy with a size value of 0 is called.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>4)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We set a reasonable BPF filter to select interesting packets.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>5)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We use pcap_getevent to get the handle of an event to wait on for packet arrival<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>6)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>When the event is signaled, we call pcap_dispatch to actually receive packets.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In our application, some of the above is done in different threads, but the pcap activities are not really thread related. Our reader thread queues arriving packets for processing elsewhere in the application.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Good Luck.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mark Pizzolato<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Anton Tremsin [mailto:ast@ssl.berkeley.edu] <br><b>Sent:</b> Wednesday, February 16, 2011 10:55 AM<br><b>To:</b> winpcap-users@winpcap.org<br><b>Cc:</b> Mark Pizzolato - WinPCap-Users<br><b>Subject:</b> Re: [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Setmintocopy wth 0 does not change anything. There is still delay till the timeout in receiving the rest of the packets. It decides by itself when to release data to me, and nothing I can do to change it.<br><br>I also verified it on an XP computer, where it behaves the same way, so it is not Windows 7 related issue.<br><br><br><br><br><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Have you tried with setmintocopy at 0?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-left:solid windowtext 1.5pt;padding:0in 0in 0in 4.0pt;border-color:-moz-use-text-color -moz-use-text-color -moz-use-text-color blue'><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color -moz-use-text-color'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> <a href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a> [<a href="mailto:winpcap-users-bounces@winpcap.org">mailto:winpcap-users-bounces@winpcap.org</a>] <b>On Behalf Of </b>Anton Tremsin<br><b>Sent:</b> Thursday, February 10, 2011 6:59 PM<br><b>To:</b> Gianluca Varenni<br><b>Cc:</b> <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br><b>Subject:</b> Re: [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Exactly, I almost always see the timeout, even with setmintocopy set to 1.<br><br>I can send multiple bunches of my packets (my each "frame" consists of 64 packets) in very short time from my detector. Then the winpcap receives then in small chunks, not a fixed number of packets. Then waits till timeout, then sends another batch of those packets sent into Winpicol long time ago, then waits for timeout again, etc. That means the data is not lost, but for some reason is being sent in small chunks rather than in packs of 64 packets, the size of these chunks does not change with value set in setmintocopy. However, it is not as simple as setmintocopy fails: I know there is data in the PC already, I read part of it after each timeout and that can continue for a long time if I make large buffer and fill it with packets from the detector.<br><br>I also tested it on another computer , which is Windows XP, not Windows 7. So that is not Windows 7 problem. Must be something else. Asked Chelsio support - they do not know any reason why it could be caused by the driver of the card.<br><br>Thanks a lot for your help.<br><br>Anton <br><br><br><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So, if you put a mintocopy of 1, you still experience a timeout in some cases?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>GV</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>PS: please do not remove <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a> from the recipients.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Anton Tremsin [<a href="mailto:ast@ssl.berkeley.edu">mailto:ast@ssl.berkeley.edu</a>] <br><b>Sent:</b> Friday, February 04, 2011 10:07 PM<br><b>To:</b> Gianluca Varenni<br><b>Subject:</b> Re: [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I do use pcap_setmintocopy() functon.<br><br>That is exactly the problem: I use value equal to 64 packets (8234*64=526976), value equal to 1 byte only - behavior seems to be very similar, packets are delayed till timeout.<br><br>Thanks,<br><br>Anton<br><br><br><br><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What value do you use for mintocopy? Do you call pcap_setmintocopy?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Have a nice day</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>GV</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Anton Tremsin [<a href="mailto:ast@ssl.berkeley.edu">mailto:ast@ssl.berkeley.edu</a>] <br><b>Sent:</b> Friday, February 04, 2011 9:39 PM<br><b>To:</b> <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br><b>Cc:</b> Gianluca Varenni<br><b>Subject:</b> Re: [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Gianluca,<br><br>Thanks a lot for helping me. I am in a dire situation since my detector really needs that problem to be solved before our experiments in couple of months time (need to do a lot of debugging and code writing after Winpcap issue is solved).<br><br>I am not loosing packets. Sorry if I made it confusing.<br><br>The packets always arrive into my C code (although Wireshark may loose them, maybe that was a confusion with packets being lost). I only need my C code to work right. The rest of packets come only after the timeout. <br><br>I varied timeout from 1 ms to 20 sec and the effect is the same. With timeout 0 - the packets do not arrive until I push more packets into Chelsio card and these, in turn, push the once which were already in some buffer. <br><br>I am using Chelsio card, but Winpcap I downloaded from the official website (version 4.1.2). <br><br>The problem seems to be as if the function setmintocopy() does not work right and the driver decides by itself how much to buffer before sending it to me. One strange thing - the number of packets being delivered to me changes from time to time, however very often number 31 (31 packets, 8234 bytes each) arrive in a single chunk. Sometimes it is 62 packets, sometimes other numbers, e.g. 57. etc.<br><br>I will be very glad if someone ca advise something I can try to resolve that issue.<br><br>Thanks again,<br><br>Anton<br><br><br><br><br><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Anton,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You say that you are using a Chelsio board. Are you using the official version of WinPcap or Chelsio provided you with a custom one? What do you set as timeout and mintocopy?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Have a nice day</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>GV</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> <a href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a> [<a href="mailto:winpcap-users-bounces@winpcap.org">mailto:winpcap-users-bounces@winpcap.org</a>] <b>On Behalf Of </b>Mark Pizzolato - WinPCap-Users<br><b>Sent:</b> Friday, January 28, 2011 11:57 AM<br><b>To:</b> <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br><b>Subject:</b> Re: [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ho Anton,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>My first question to you would be:</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>WHY are you using WinPcap to receive UDP packets?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This sounds like a job for a winsock application….</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mark Pizzolato</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-left:solid windowtext 1.5pt;padding:0in 0in 0in 4.0pt;border-color:-moz-use-text-color -moz-use-text-color -moz-use-text-color blue'><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> <a href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a> [<a href="mailto:winpcap-users-bounces@winpcap.org">mailto:winpcap-users-bounces@winpcap.org</a>] <b>On Behalf Of </b>Anton Tremsin<br><b>Sent:</b> Friday, January 28, 2011 11:50 AM<br><b>To:</b> <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br><b>Subject:</b> [Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>I hope someone can help my problem receiving packets in Windows7<br><br>I am sending data by UDP packets from an FPGA through 10GB card (Chelsio). Using VC++ 2010 to compile code to receive them. <br><br>All packets arrive, no losses seen, but the problem is with the proper <b>operation of pcap_setmintocopy() function.</b> <br><br><b>I send 64 packets with 8234 bytes each. Receiving them through pcp_next_ex() and I only get 31 packets (sometimes 62, sometimes 47, 50 packets) before the timeout occurs. After timeout the rest of the packets arrives. <br></b><br>I set the minimum amount of data in the kernel buffer that causes a read from the application to return (unless the timeout expires) to be 1 byte or it to be all 8234x64 bytes, no difference. Looks like the setmintocpy function has no effect on my kernel buffer to be copied to my application. If I send another set of 64 packets - data arrives into pcp_next_ex(), still only in lamp of 31 (62, 47,50) packets <br><br>That is a big problem for my application.<br><br><b>Is there anything I am doing wrong or need to change something in the system/driver to make setmintocopy function to operate properly?<br></b><br>Thanks a lot for your help, <br><br>Anton Tremsin<br><br><br><br><br><br><o:p></o:p></p><pre>-- <o:p></o:p></pre><pre> <o:p></o:p></pre><pre>Anton S. Tremsin, Ph.D.<o:p></o:p></pre><pre>Space Sciences Laboratory<o:p></o:p></pre><pre>University of California at Berkeley<o:p></o:p></pre><pre>Berkeley, CA 94720<o:p></o:p></pre><pre>Tel: (510) 642 4554<o:p></o:p></pre></div><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Winpcap-users mailing list<o:p></o:p></pre><pre><a href="mailto:Winpcap-users@winpcap.org">Winpcap-users@winpcap.org</a><o:p></o:p></pre><pre><a href="https://www.winpcap.org/mailman/listinfo/winpcap-users">https://www.winpcap.org/mailman/listinfo/winpcap-users</a><o:p></o:p></pre><pre> <o:p></o:p></pre><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><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Winpcap-users mailing list<o:p></o:p></pre><pre><a href="mailto:Winpcap-users@winpcap.org">Winpcap-users@winpcap.org</a><o:p></o:p></pre><pre><a href="https://www.winpcap.org/mailman/listinfo/winpcap-users">https://www.winpcap.org/mailman/listinfo/winpcap-users</a><o:p></o:p></pre><pre> <o:p></o:p></pre><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>